1.0.6 • Published 6 years ago

tobostudio.cordova-sqlite-storage v1.0.6

Weekly downloads
6
License
MIT
Repository
github
Last release
6 years ago

Cordova/PhoneGap sqlite storage plugin

Native interface to sqlite in a Cordova/PhoneGap plugin for Android, iOS, macOS, and Windows 10 (UWP), with API similar to HTML5/Web SQL API.

License terms for Android and Windows platform versions: MIT or Apache 2.0

License terms for iOS/macOS platform version: MIT only

About this plugin version branch

This is the common version branch which supports the most widely used features and serves as the basis for the other versions.

This version branch uses a before_plugin_install hook to install sqlite3 library dependencies from cordova-sqlite-storage-dependencies via npm.

IMPORTANT Windows deprecation NOTICE: The Windows platform is now scheduled to be removed from the next major release of this plugin version, will continue to be supported in other plugin versions such as cordova-sqlite-ext (permissive license terms), cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms), etc. For discussion and reference: https://github.com/litehelpers/Cordova-sqlite-storage/issues/687

IMPORTANT API DEPRECATION NOTICE

The "standard" transaction API documented in Standard asynchronous transactions section (db.transaction() and db.readTransaction calls) are now deprecated in this plugin version and scheduled to be removed from the next major release ref: https://github.com/litehelpers/Cordova-sqlite-storage/issues/720 (will NOT be removed from cordova-sqlite-ext (permissive license terms), cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms), etc.)

It is recommended to use the following calls instead:

  • db.executeSql() to read data or execute a single modification statement
  • db.sqlBatch() to execute a batch of modification statements within an ACID (atomic, failure-safe) transaction.

Note that the "standard" (deprecated) transaction API calls will continue to be supported by other plugin versions such as cordova-sqlite-ext (permissive license terms) and cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms).

WARNING: Multiple SQLite problem on Android

This plugin uses a non-standard Android-sqlite-connector implementation on Android. In case an application access the same database using multiple plugins there is a risk of data corruption ref: litehelpers/Cordova-sqlite-storage#626) as described in http://ericsink.com/entries/multiple_sqlite_problem.html and https://www.sqlite.org/howtocorrupt.html.

The workaround is to use the androidDatabaseImplementation: 2 setting as described in the Android sqlite implementation section below:

var db = window.sqlitePlugin.openDatabase({name: "my.db", androidDatabaseImplementation: 2});

Available for hire

The primary author and maintainer @brodybits (Christopher J. Brody aka Chris Brody) is available for part-time contract assignments. Services available for this project include:

  • Priority issue support
  • Help with application code such as debugging, optimization, etc.
  • Warranty and support retainers
  • Priority fixes and enhancements
  • Custom feature development

Other services available include:

  • Front-end/back-end development
  • Mentoring and training services

For more information:

A quick tour

To open a database:

var db = null;

document.addEventListener('deviceready', function() {
  db = window.sqlitePlugin.openDatabase({name: 'demo.db', location: 'default'});
});

IMPORTANT: Like with the other Cordova plugins your application must wait for the deviceready event. This is especially tricky in Angular/ngCordova/Ionic controller/factory/service callbacks which may be triggered before the deviceready event is fired.

Using deprecated transaction API

NOTICE: Support for this API is scheduled to be removed from the next major release ref: https://github.com/litehelpers/Cordova-sqlite-storage/issues/720. It is recommended to use db.executeSql() and db.sqlBatch() as described below.

To populate a database using the standard transaction API:

  db.transaction(function(tx) {
    tx.executeSql('CREATE TABLE IF NOT EXISTS DemoTable (name, score)');
    tx.executeSql('INSERT INTO DemoTable VALUES (?,?)', ['Alice', 101]);
    tx.executeSql('INSERT INTO DemoTable VALUES (?,?)', ['Betty', 202]);
  }, function(error) {
    console.log('Transaction ERROR: ' + error.message);
  }, function() {
    console.log('Populated database OK');
  });

To check the data using the "standard" (deprecated) transaction API:

  db.transaction(function(tx) {
    tx.executeSql('SELECT count(*) AS mycount FROM DemoTable', [], function(tx, rs) {
      console.log('Record count (expected to be 2): ' + rs.rows.item(0).mycount);
    }, function(tx, error) {
      console.log('SELECT error: ' + error.message);
    });
  });

Using recommended API calls

To populate a database using the SQL batch API:

  db.sqlBatch([
    'CREATE TABLE IF NOT EXISTS DemoTable (name, score)',
    [ 'INSERT INTO DemoTable VALUES (?,?)', ['Alice', 101] ],
    [ 'INSERT INTO DemoTable VALUES (?,?)', ['Betty', 202] ],
  ], function() {
    console.log('Populated database OK');
  }, function(error) {
    console.log('SQL batch ERROR: ' + error.message);
  });

To check the data using the single SQL statement API:

  db.executeSql('SELECT count(*) AS mycount FROM DemoTable', [], function(rs) {
    console.log('Record count (expected to be 2): ' + rs.rows.item(0).mycount);
  }, function(error) {
    console.log('SELECT SQL statement ERROR: ' + error.message);
  });

See the Sample section for a sample with a more detailed explanation.

Status

  • The "standard" transaction API documented in Standard asynchronous transactions section (db.transaction() and db.readTransaction calls) are now deprecated in this plugin version and scheduled to be removed from the next major release ref: https://github.com/litehelpers/Cordova-sqlite-storage/issues/720. It is recommended to use db.executeSql() and db.sqlBatch() instead, as documented below. NOTE that the "standard", deprecated API calls will NOT be removed from other plugin versions such as cordova-sqlite-ext (permissive license terms) or cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms).
  • This plugin is NOT supported by PhoneGap Developer App or PhoneGap Desktop App.
  • This plugin version uses a before_plugin_install hook to install sqlite3 library dependencies from cordova-sqlite-storage-dependencies via npm.
  • Use of other systems such as Cordova Plugman, PhoneGap CLI, PhoneGap Build, and Intel XDK is no longer supported by this plugin version since they do not honor the before_plugin_install hook. The supported solution is to use litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms); alternative with permissive license terms is available at: brodybits / cordova-sqlite-legacy-build-support (limited testing, limited updates).
  • SQLite 3.15.2 included when building (all platforms), with the following definitions for iOS/macOS/Windows:
    • SQLITE_THREADSAFE=1 (SQLITE_THREADSAFE=2 on iOS/macOS)
    • SQLITE_DEFAULT_MEMSTATUS=0
    • SQLITE_OMIT_DECLTYPE
    • SQLITE_OMIT_DEPRECATED
    • SQLITE_OMIT_PROGRESS_CALLBACK
    • SQLITE_OMIT_SHARED_CACHE
    • SQLITE_TEMP_STORE=2
    • SQLITE_OMIT_LOAD_EXTENSION
    • SQLITE_ENABLE_FTS3
    • SQLITE_ENABLE_FTS3_PARENTHESIS
    • SQLITE_ENABLE_FTS4
    • SQLITE_ENABLE_RTREE
    • SQLITE_DEFAULT_PAGE_SIZE=1024 and SQLITE_DEFAULT_CACHE_SIZE=2000 to avoid "potentially distruptive change(s)" from SQLite 3.12.0 described at: http://sqlite.org/pgszchng2016.html
    • SQLITE_OS_WINRT (Windows only)
    • NDEBUG (Windows only)
  • The iOS database location is now mandatory, as documented below.
  • This version branch supports the use of two (2) possible Android sqlite database implementations:
  • Support for WP8 along with Windows 8.1/Windows Phone 8.1/Windows 10 using Visual Studio 2015 is available in: litehelpers / Cordova-sqlite-legacy-build-support
  • The following features are available in litehelpers / cordova-sqlite-ext:
    • REGEXP (Android/iOS/macOS)
    • SELECT BLOB data in Base64 format (all platforms Android/iOS/macOS/Windows)
    • Pre-populated database (Android/iOS/macOS/Windows)
  • Amazon Fire-OS is dropped due to lack of support by Cordova. Android platform version should be used to deploy to Fire-OS 5.0(+) devices. For reference: cordova/cordova-discuss#32 (comment)
  • Windows platform version (using a customized version of the performant doo / SQLite3-WinRT C++ component) has the following known limitations:
    • This version branch has dependency on platform toolset libraries included by Visual Studio 2017 (litehelpers/Cordova-sqlite-storage#580). Visual Studio 2015 is now supported by litehelpers / Cordova-sqlite-legacy-build-support.
    • It is not possible to use this plugin with the default "Any CPU" target. A specific target CPU type must be specified when building an app with this plugin.
    • Truncation issue with UNICODE \u0000 character (same as \0)
    • No background processing
    • INCORRECT error code (0) and INCONSISTENT error message (missing actual error info) in error callbacks ref: litehelpers/Cordova-sqlite-storage#539
    • Not possible to read BLOB column values
    • Windows platform version uses UTF-16le internal database encoding while the other platform versions use UTF-8 internal encoding. (UTF-8 internal encoding is preferred ref: litehelpers/Cordova-sqlite-storage#652)
  • The macOS platform version ("osx" platform) is not tested in a release build and should be considered pre-alpha.
  • Android versions supported: 2.3.3 - 7.1.1 (API level 10 - 25), depending on Cordova version ref: https://cordova.apache.org/docs/en/latest/guide/platforms/android/
  • iOS versions supported: 8.x / 9.x / 10.x / 11.x (see deviations section below for differences in case of WKWebView)
  • FTS3, FTS4, and R-Tree are fully tested and supported for all target platforms in this version branch.
  • Default PRAGMA journal_mode setting (tested):
    • Android with builtin android.database implementation (as selected using the androidDatabaseImplementation option in window.sqlitePlugin.openDatabase): persist (pre-8.x) / truncate (Android 8+)
    • otherwise: delete
  • AUTO-VACUUM is not enabled by default. If no form of VACUUM or PRAGMA auto_vacuum is used then sqlite will automatically reuse deleted data space for new data but the database file will never shrink. For reference: http://www.sqlite.org/pragma.html#pragma_auto_vacuum and litehelpers/Cordova-sqlite-storage#646
  • In case of memory issues please use smaller transactions or use the plugin version at litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms).

Announcements

Highlights

  • Drop-in replacement for HTML5/Web SQL API: the only change should be to replace the static window.openDatabase() factory call with window.sqlitePlugin.openDatabase(), with parameters as documented below. Known deviations are documented in the deviations section below.
  • Failure-safe nested transactions with batch processing optimizations (according to HTML5/Web SQL API)
  • Transaction API (based on HTML5/Web SQL API) is designed for maximum flexiblibility, does not allow any transactions to be left hanging open.
  • As described in this posting:
    • Keeps sqlite database in known, platform specific user data location on all supported platforms (Android/iOS/macOS/Windows), which can be reconfigured on iOS/macOS. Whether or not the database on the iOS platform is synchronized to iCloud depends on the selected database location.
    • No arbitrary size limit. SQLite limits described at: http://www.sqlite.org/limits.html
  • Also validated for multi-page applications by internal test selfTest function.
  • This project is self-contained though with sqlite3 dependencies auto-fetched by npm. There are no dependencies on other plugins such as cordova-plugin-file.
  • Windows platform version uses a customized version of the performant doo / SQLite3-WinRT C++ component.
  • SQLCipher support for Android/iOS/macOS/Windows is available in: litehelpers / Cordova-sqlcipher-adapter
  • Intellectual property:
    • All source code is tracked to the original author in git
    • Major authors are tracked in AUTHORS.md
    • License of each component is tracked in LICENSE.md
    • History of this project is also described in HISTORY.md

TIP: It is possible to migrate from Cordova to a pure native solution and continue using the data stored by this plugin.

Getting started

Recommended prerequisites

  • Install a recent version of Cordova CLI, create a simple app with no plugins, and run it on the desired target platforms.
  • Add a very simple plugin such as cordova-plugin-dialogs or an echo plugin and get it working. Ideally you should be able to handle a callback with some data coming from a prompt.

These prereqisites are very well documented in a number of excellent resources including:

More resources can be found by https://www.google.com/search?q=cordova+tutorial. There are even some tutorials available on YouTube as well.

In addition, this guide assumes a basic knowledge of some key JavaScript concepts such as variables, function calls, and callback functions. There is an excellent explanation of JavaScript callbacks at http://cwbuecheler.com/web/tutorials/2013/javascript-callbacks/.

MAJOR TIPS: As described in the Installing section:

  • It is recommended to use the --save flag when installing plugins to track them in config.xml. If all plugins are tracked in config.xml then there is no need to commit the plugins subdirectory tree into the source repository.
  • In general it is not recommended to commit the platforms subdirectory tree into the source repository.

NOTICE: This plugin is only supported with the Cordova CLI. This plugin is not supported with other Cordova/PhoneGap systems such as PhoneGap CLI, PhoneGap Build, Plugman, Intel XDK, Webstorm, etc.

Windows platform notes

The Windows platform can present a number of challenges which increase when using this plugin. The following tips are recommended for getting started with Windows:

  • First start to build and run an app on another platform such as Android or iOS with this plugin.
  • Try working with a very simple app using simpler plugins such as cordova-plugin-dialogs and possibly cordova-plugin-file on the Windows platform.
  • Read through the Windows platform usage of the Installing section.
  • Then try adding this plugin to a very simple app such as brodybits / cordova-sqlite-test-app and running the Windows project in the Visual Studio GUI with a specific target CPU selected. WARNING: It is not possible to use this plugin with the "Any CPU" target.

Quick installation

Use the following command to install this plugin from the Cordova CLI:

cordova plugin add cordova-sqlite-storage --save

Add any desired platform(s) if not already present, for example:

cordova platform add android

OPTIONAL: prepare before building (MANDATORY for cordova-ios older than 4.3.0 (Cordova CLI 6.4.0))

cordova prepare

or to prepare for a single platform, Android for example:

cordova prepare android

Please see the Installing section for more details.

NOTE: The new brodybits / cordova-sqlite-test-app project includes the echo test, self test, and string test described below along with some more sample functions.

Self test

Try the following programs to verify successful installation and operation:

Echo test - verify successful installation and build:

document.addEventListener('deviceready', function() {
  window.sqlitePlugin.echoTest(function() {
    console.log('ECHO test OK');
  });
});

Self test - automatically verify basic database access operations including opening a database; basic CRUD operations (create data in a table, read the data from the table, update the data, and delete the data); close and delete the database:

document.addEventListener('deviceready', function() {
  window.sqlitePlugin.selfTest(function() {
    console.log('SELF test OK');
  });
});

NOTE: It may be easier to use a JavaScript or native alert function call along with (or instead of) console.log to verify that the installation passes both tests. Same for the SQL string test variations below. (Note that the Windows platform does not support the standard alert function, please use cordova-plugin-dialogs instead.)

SQL string test

This test verifies that you can open a database, execute a basic SQL statement, and get the results (should be TEST STRING):

document.addEventListener('deviceready', function() {
  var db = window.sqlitePlugin.openDatabase({name: 'test.db', location: 'default'});
  db.transaction(function(tr) {
    tr.executeSql("SELECT upper('Test string') AS upperString", [], function(tr, rs) {
      console.log('Got upperString result: ' + rs.rows.item(0).upperString);
    });
  });
});

Here is a variation that uses a SQL parameter instead of a string literal:

document.addEventListener('deviceready', function() {
  var db = window.sqlitePlugin.openDatabase({name: 'test.db', location: 'default'});
  db.transaction(function(tr) {
    tr.executeSql('SELECT upper(?) AS upperString', ['Test string'], function(tr, rs) {
      console.log('Got upperString result: ' + rs.rows.item(0).upperString);
    });
  });
});

Moving forward

It is recommended to read through the usage and sample sections before building more complex applications. In general it is recommended to start by doing things one step at a time, especially when an application does not work as expected.

The new brodybits / cordova-sqlite-test-app sample is intended to be a boilerplate to reproduce and demonstrate any issues you may have with this plugin. You may also use it as a starting point to build a new app.

In case you get stuck with something please read through the support section and follow the instructions before raising an issue. Professional support is also available by contacting: sales@litehelpers.net

Plugin usage examples

Plugin tutorials

NOTICE: The above tutorial shows cordova plugin add cordova-sqlite-storage with the --save flag missing. Please be sure to use the --save flag to keep the plugins in config.xml.

Other plugin tutorials wanted ref: litehelpers/Cordova-sqlite-storage#609

SQLite resources

Some other Cordova resources

Some apps using this plugin

Security

Security of sensitive data

According to Web SQL Database API 7.2 Sensitivity of data:

User agents should treat persistently stored data as potentially sensitive; it's quite possible for e-mails, calendar appointments, health records, or other confidential documents to be stored in this mechanism.

To this end, user agents should ensure that when deleting data, it is promptly deleted from the underlying storage.

Unfortunately this plugin will not actually overwrite the deleted content unless the secure_delete PRAGMA is used.

SQL injection

As "strongly recommended" by Web SQL Database API 8.5 SQL injection:

Authors are strongly recommended to make use of the ? placeholder feature of the executeSql() method, and to never construct SQL statements on the fly.

Avoiding data loss

  • Double-check that the application code follows the documented API for SQL statements, parameter values, success callbacks, and error callbacks.
  • For standard Web SQL transactions include a transaction error callback with the proper logic that indicates to the user if data cannot be stored for any reason. In case of individual SQL error handlers be sure to indicate to the user if there is any issue with storing data.
  • For single statement and batch transactions include an error callback with logic that indicates to the user if data cannot be stored for any reason.

Deviations

Some known deviations from the Web SQL database standard

  • The window.sqlitePlugin.openDatabase static factory call takes a different set of parameters than the standard Web SQL window.openDatabase static factory call. In case you have to use existing Web SQL code with no modifications please see the Web SQL replacement tip below.
  • This plugin does not support the database creation callback or standard database versions. Please read the Database schema versions section below for tips on how to support database schema versioning.
  • This plugin does not support the synchronous Web SQL interfaces.
  • Known issues with handling of certain ASCII/UNICODE characters as described below.
  • It is possible to request a SQL statement list such as "SELECT 1; SELECT 2" within a single SQL statement string, however the plugin will only execute the first statement and silently ignore the others ref: litehelpers/Cordova-sqlite-storage#551
  • It is possible to insert multiple rows like: transaction.executeSql('INSERT INTO MyTable VALUES (?,?),(?,?)', ['Alice', 101, 'Betty', 102]); which was not supported by SQLite 3.6.19 as referenced by Web SQL API section 5. The iOS WebKit Web SQL implementation seems to support this as well.
  • Unlike the HTML5/Web SQL API this plugin handles executeSql calls with too few parameters without error reporting. In case of too many parameters this plugin reports error code 0 (SQLError.UNKNOWN_ERR) while Android/iOS (WebKit) Web SQL correctly reports error code 5 (SQLError.SYNTAX_ERR) ref: https://www.w3.org/TR/webdatabase/#dom-sqlexception-code-syntax
  • Positive and negative Infinity SQL parameter argument values are treated like null by this plugin on Android and iOS ref: litehelpers/Cordova-sqlite-storage#405
  • Positive and negative Infinity result values cause a crash on iOS/macOS cases ref: litehelpers/Cordova-sqlite-storage#405
  • Known issue(s) with of certain ASCII/UNICODE characters as described below.
  • Boolean true and false values are handled by converting them to the "true" and "false" TEXT string values, same as WebKit Web SQL on Android and iOS. This does not seem to be 100% correct as discussed in: litehelpers/Cordova-sqlite-storage#545
  • A number of uncategorized errors such as CREATE VIRTUAL TABLE USING bogus module are reported with error code 5 (SQLError.SYNTAX_ERR) on Android/iOS/macOS by both (WebKit) Web SQL and this plugin.
  • Issues with error code on Windows as well as Android with the androidDatabaseImplementation: 2 setting described below.
  • In case of an issue that causes an API function to throw an exception (Android/iOS WebKit) Web SQL includes includes a code member with value of 0 (SQLError.UNKNOWN_ERR) in the exception while the plugin includes no such code member.
  • This plugin supports some non-standard features as documented below.
  • Results of SELECT with BLOB data such as SELECT LOWER(X'40414243') AS myresult, SELECT X'40414243' AS myresult, or reading data stored by INSERT INTO MyTable VALUES (X'40414243') are not consistent on Android in case the built-in Android database is used (using the androidDatabaseImplementation: 2 setting in window.sqlitePlugin.openDatabase) or Windows. (These work with Android/iOS WebKit Web SQL and have been supported by SQLite for a number of years.)
  • Whole number parameter argument values such as 42, -101, or 1234567890123 are handled as INTEGER values by this plugin on Android, iOS (default UIWebView), and Windows while they are handled as REAL values by (WebKit) Web SQL and this plugin on macOS or iOS with WKWebView. This is evident in certain test operations such as SELECT ? as myresult or SELECT TYPEOF(?) as myresult and storage in a field with TEXT affinity.
  • INTEGER, REAL, +/- Infinity, NaN, null, undefined parameter argument values are handled as TEXT string values on Android in case the built-in Android database (androidDatabaseImplementation: 2 setting) is used. (This is evident in certain test operations such as SELECT ? as myresult or SELECT TYPEOF(?) as myresult and storage in a field with TEXT affinity.)
  • In case of invalid transaction callback arguments such as string values the plugin attempts to execute the transaction while (WebKit) Web SQL would throw an exception.
  • The plugin handles invalid SQL arguments array values such as false, true, or a string as if there were no arguments while (WebKit) Web SQL would throw an exception. NOTE: In case of a function in place of the SQL arguments array WebKit Web SQL would report a transaction error while the plugin would simply ignore the function.
  • In case of invalid SQL callback arguments such as string values the plugin may execute the SQL and signal transaction success or failure while (WebKit) Web SQL would throw an exception.
  • In certain cases such as transaction.executeSql(null) or transaction.executeSql(undefined) the plugin throws an exception while (WebKit) Web SQL indicates a transaction failure.
  • In certain cases such as transaction.executeSql() with no arguments (Android/iOS WebKit) Web SQL includes includes a code member with value of 0 (SQLError.UNKNOWN_ERR) in the exception while the plugin includes no such code member.
  • If the SQL arguments are passed in an Array subclass object where the constructor does not point to Array then the SQL arguments are ignored by the plugin.
  • The results data objects are not immutable as specified/implied by Web SQL API section 4.5.

Security of deleted data

See Security of sensitive data in the Security section above.

Other differences with WebKit Web SQL implementations

  • In case of ignored INSERT OR IGNORE statement WebKit Web SQL (Android/iOS) reports insertId with an old INSERT row id value while the plugin reports insertId: undefined.
  • In case of a SQL error handler that does not recover the transaction, WebKit Web SQL (Android/iOS) would incorrectly report error code 0 while the plugin would report the same error code as in the SQL error handler. (In case of an error with no SQL error handler then Android/iOS WebKit Web SQL would report the same error code that would have been reported in the SQL error hander.)
  • In case a transaction function throws an exception, the message and code if present are reported by the plugin but not by (WebKit) Web SQL.
  • SQL error messages are inconsistent on Windows.
  • There are some other differences in the SQL error messages reported by WebKit Web SQL and this plugin.

Known issues

  • The iOS/macOS platform versions do not support certain rapidly repeated open-and-close or open-and-delete test scenarios due to how the implementation handles background processing
  • The Android platform version does not always handle four-byte UTF-8 characters emoji characters such as \u1F603 (SMILING FACE, MOUTH OPEN) correctly ref: litehelpers/Cordova-sqlite-storage#564. It is sometimes possible to store and retrieve such characters but certain operations such as hex conversions do not work properly when using the default Android-sqlite-connector database implementation. It is suspected that such characters would be stored incorrectly by the default Android platform version. Note that this is not an issue in case the built-in Android database is used (using the androidDatabaseImplementation: 2 setting in window.sqlitePlugin.openDatabase)
  • It is possible to request a SQL statement list such as "SELECT 1; SELECT 2" within a single SQL statement string, however the plugin will only execute the first statement and silently ignore the others ref: litehelpers/Cordova-sqlite-storage#551
  • Execution of INSERT statement that affects multiple rows (due to SELECT cause or using TRIGGER(s), for example) reports incorrect rowsAffected on Android in case the built-in Android database used (using the androidDatabaseImplementation option in window.sqlitePlugin.openDatabase)
  • Memory issue observed when adding a large number of records due to the JSON implementation which is improved in litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms)
  • Infinity (positive or negative) values are not supported on Android/iOS/macOS due to issues described above including a possible crash on iOS/macOS ref: litehelpers/Cordova-sqlite-storage#405
  • A stability issue was reported on the iOS platform version when in use together with SockJS client such as pusher-js at the same time (see litehelpers/Cordova-sqlite-storage#196). The workaround is to call sqlite functions and SockJS client functions in separate ticks (using setTimeout with 0 timeout).
  • SQL errors are reported with an INCORRECT error code (0) on Windows ref: litehelpers/Cordova-sqlite-storage#539. In certain cases SQL errors are also reported with error code 0 on Android in case the built-in Android database is used (using the androidDatabaseImplementation: 2 setting in window.sqlitePlugin.openDatabase).
  • Possible crash on Android when using Unicode emoji and other 4-octet UTF-8 characters due to Android bug 81341, which should be fixed in Android 6.x
  • Close/delete database bugs described below.
  • When a database is opened and deleted without closing, the iOS/macOS platform version is known to leak resources.
  • It is NOT possible to open multiple databases with the same name but in different locations (iOS/macOS platform version).

Some additional issues are tracked in open Cordova-sqlite-storage bug-general issues.

Other limitations

  • The db version, display name, and size parameter values are not supported and will be ignored. (No longer supported by the API)
  • Absolute and relative subdirectory path(s) are not tested or supported.
  • This plugin will not work before the callback for the 'deviceready' event has been fired, as described in Usage. (This is consistent with the other Cordova plugins.)
  • Extremely large records are not supported by this plugin. It is recommended to store images and similar binary data in separate files. TBD: specify maximum record. For future consideration: support in a plugin version such as litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms).
  • This plugin version will not work within a web worker (not properly supported by the Cordova framework). Use within a web worker is supported for Android/iOS in litehelpers / cordova-sqlite-evmax-ext-workers-legacy-build-free (GPL or premium commercial license terms).
  • In-memory database db=window.sqlitePlugin.openDatabase({name: ':memory:', ...}) is currently not supported.
  • The Android platform version cannot properly support more than 100 open database files due to the threading model used.
  • SQL error messages reported by Windows platform version are not consistent with Android/iOS/macOS platform versions.
  • UNICODE \u2028 (line separator) and \u2029 (paragraph separator) characters are currently not supported and known to be broken on iOS, macOS, and Android platform versions due to JSON issues reported in Cordova bug CB-9435 and cordova/cordova-discuss#57. This is fixed with a workaround for iOS/macOS in: litehelpers / Cordova-sqlite-evplus-legacy-free and litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free (GPL or special commercial license terms) as well as litehelpers / Cordova-sqlite-evplus-legacy-workers-free (GPL or premium commercial license terms).
  • The BLOB data type is not fully supported by this version branch. SELECT BLOB in Base64 format is supported by litehelpers / cordova-sqlite-ext (permissive license terms) and litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license options).
  • Truncation in case of UNICODE \u0000 (same as \0) character on Android (default Android-sqlite-connector database implementation) and Windows.
  • Case-insensitive matching and other string manipulations on Unicode characters, which is provided by optional ICU integration in the sqlite source and working with recent versions of Android, is not supported for any target platforms.
  • The iOS/macOS platform version uses a thread pool but with only one thread working at a time due to "synchronized" database access.
  • Some large query results may be slow, also due to the JSON implementation.
  • ATTACH to another database file is not supported by this version branch. Attach/detach is supported (along with the memory and iOS UNICODE \u2028 line separator / \u2029 paragraph separator fixes) in litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free (GPL or special commercial license terms).
  • UPDATE/DELETE with LIMIT or ORDER BY is not supported.
  • WITH clause is not supported on some older Android platform versions in case the androidDatabaseImplementation: 2 (built-in android.database implementation) option is used.
  • User-defined savepoints are not supported and not expected to be compatible with the transaction locking mechanism used by this plugin. In addition, the use of BEGIN/COMMIT/ROLLBACK statements is not supported.
  • Problems have been reported when using this plugin with Crosswalk (for Android). It may help to install Crosswalk as a plugin instead of using Crosswalk to create the project.
  • Does not work with axemclion / react-native-cordova-plugin since the window.sqlitePlugin object is not properly exported (ES5 feature). It is recommended to use andpor / react-native-sqlite-storage for SQLite database access with React Native Android/iOS instead.

Additional limitations are tracked in marked Cordova-sqlite-storage doc-todo issues.

Further testing needed

Some tips and tricks

  • If you run into problems and your code follows the asynchronous HTML5/Web SQL transaction API, you can try opening a test database using window.openDatabase and see if you get the same problems.
  • In case your database schema may change, it is recommended to keep a table with one row and one column to keep track of your own schema version number. It is possible to add it later. The recommended schema update procedure is described below.

Pitfalls

Some common pitfall(s)

  • If a database is opened using the standard window.openDatabase call it will not have any of the benefits of this plugin and features such as the sqlBatch call would not be available.
  • It is NOT allowed to execute sql statements on a transaction that has already finished, as described below. This is consistent with the HTML5/Web SQL API.
  • The plugin class name starts with "SQL" in capital letters, but in Javascript the sqlitePlugin object name starts with "sql" in small letters.
  • Attempting to open a database before receiving the 'deviceready' event callback.
  • Inserting STRING into ID field
  • Auto-vacuum is NOT enabled by default. It is recommended to periodically VACUUM the database. If no form of VACUUM or PRAGMA auto_vacuum is used then sqlite will automatically reuse deleted data space for new data but the database file will never shrink. For reference: http://www.sqlite.org/pragma.html#pragma_auto_vacuum and litehelpers/Cordova-sqlite-storage#646
  • Transactions on a database are run sequentially. A large transaction could block smaller transactions requested afterwards.

Some weird pitfall(s)

Angular/ngCordova/Ionic-related pitfalls

Windows platform pitfalls

  • This plugin does not work with the default "Any CPU" target. A specific, valid CPU target platform must be specified.
  • It is not allowed to change the app ID in the Windows platform project. As described in the Windows platform usage of the Installing section a Windows-specific app ID may be declared using the windows-identity-name attribute or "WindowsStoreIdentityName" setting.
  • A problem locating SQLite3.md generally means that there was a problem building the C++ library.
  • Visual Studio 2015 is no longer supported by this version. Visual Studio 2015 is now supported by litehelpers / Cordova-sqlite-legacy-build-support.

General Cordova pitfalls

Documented in: brodybits / Avoiding-some-Cordova-pitfalls

General SQLite pitfalls

From https://www.sqlite.org/datatype3.html#section_1:

SQLite uses a more general dynamic type system.

This is generally nice to have, especially in conjunction with a dynamically typed language such as JavaScript. Here are some major SQLite data typing principles:

However there are some possible gotchas:

  1. From https://www.sqlite.org/datatype3.html#section_3_2:

    Note that a declared type of "FLOATING POINT" would give INTEGER affinity, not REAL affinity, due to the "INT" at the end of "POINT". And the declared type of "STRING" has an affinity of NUMERIC, not TEXT.

  2. From ibid: a column declared as "DATETIME" has NUMERIC affinity, which gives no hint whether an INTEGER Unix time value, a REAL Julian time value, or possibly even a TEXT ISO8601 date/time string may be stored (further refs: https://www.sqlite.org/datatype3.html#section_2_2, https://www.sqlite.org/datatype3.html#section_3)

From https://groups.google.com/forum/#!topic/phonegap/za7z51_fKRw, as discussed in litehelpers/Cordova-sqlite-storage#546: it was discovered that are some more points of possible confusion with date/time. For example, there is also a datetime function that returns date/time in TEXT string format. This should be considered a case of "DATETIME" overloading since SQLite is not case sensitive. This could really become confusing if different programmers or functions consider date/time to be stored in different ways.

FUTURE TBD: Proper date/time handling will be further tested and documented at some point.

Major TODOs

For future considertion

Alternatives

Comparison of sqlite plugin versions

  • litehelpers / Cordova-sqlite-storage - core plugin version for Android/iOS/macOS/Windows (permissive license terms)
  • litehelpers / cordova-sqlite-ext - plugin version with REGEXP (Android/iOS/macOS), SELECT BLOB in Base64 format (all platforms Android/iOS/macOS/Windows), and pre-populated databases (all platforms Android/iOS/macOS/Windows). Permissive license terms.
  • litehelpers / cordova-sqlite-legacy - support for Windows 8.1/Windows Phone 8.1 along with Android/iOS/macOS/Windows 10, with support for REGEXP (Android/iOS/macOS), SELECT BLOB in Base64 format (all platforms Android/iOS/macOS/Windows), and pre-populated databases (all platforms Android/iOS/macOS/Windows). Limited updates. Permissive license terms.
  • brodybits / cordova-sqlite-legacy-build-support - maintenance of WP8 platform version along with Windows 8.1/Windows Phone 8.1 and the other supported platforms Android/iOS/macOS/Windows 10; limited support for PhoneGap CLI/PhoneGap Build/plugman/Intel XDK; limited testing; limited updates. Permissive license terms.
  • litehelpers / Cordova-sqlcipher-adapter - supports SQLCipher for Android/iOS/macOS/Windows
  • litehelpers / Cordova-sqlite-evcore-extbuild-free - Enhancements for Android: JSON and SQL statement handling implemented in C, supports larger transactions and handles large SQL batches in less than half the time as this plugin version. Supports arbitrary database location on Android. Support for build environments such as PhoneGap Build and Intel XDK. Also includes REGEXP (Android/iOS/macOS) and SELECT BLOB in Base64 format (all platforms Android/iOS/macOS/Windows). GPL or commercial license terms.
  • litehelpers / cordova-sqlite-evplus-ext-legacy-build-free - internal memory improvements to support larger transactions (Android/iOS) and fix to support all Unicode characters (iOS). (GPL or special commercial license terms).
  • litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free - plugin version with support for ATTACH, includes internal memory improvements to support larger transactions (Android/iOS) and fix to support all Unicode characters (GPL or special commercial license terms).
  • litehelpers / cordova-sqlite-evmax-ext-workers-legacy-build-free - plugin version with support for web workers, includes internal memory improvements to support larger transactions (Android/iOS) and fix to support all Unicode characters (iOS). (GPL or premium commercial license terms).
  • Adaptation for React Native Android and iOS: andpor / react-native-sqlite-storage (permissive license terms)
  • Original plugin version for iOS (with a non-standard, outdated transaction API): davibe / Phonegap-SQLitePlugin (permissive license terms)

Other SQLite access projects

Alternative storage solutions

Usage

Self-test functions

To verify that both the Javascript and native part of this plugin are installed in your application:

window.sqlitePlugin.echoTest(successCallback, errorCallback);

To verify that this plugin is able to open a database (named ___$$$___litehelpers___$$$___test___$$$___.db), execute the CRUD (create, read, update, and delete) operations, and clean it up properly:

window.sqlitePlugin.selfTest(successCallback, errorCallback);

IMPORTANT: Please wait for the 'deviceready' event (see below for an example).

General

  • Drop-in replacement for HTML5/Web SQL API: the only change should be to replace the static window.openDatabase() factory call with window.sqlitePlugin.openDatabase(), with parameters as documented below. Some other known deviations are described in this document. Reports of any other deviations would be appreciated.
  • Single-page application design is recommended.
  • In case of a multi-page application the JavaScript used by each page must use sqlitePlugin.openDatabase to open the database access handle object before it can access the data.

NOTE: If a sqlite statement in a transaction fails with an error, the error handler must return false in order to recover the transaction. This is correct according to the HTML5/Web SQL API standard. This is different from the WebKit implementation of Web SQL in Android and iOS which recovers the transaction if a sql error hander returns a non-true value.

See the Sample section for a sample with detailed explanations.

Opening a database

To open a database access handle object (in the new default location):

var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'}, successcb, errorcb);

WARNING: The new "default" location value is NOT the same as the old default location and would break an upgrade for an app that was using the old default value (0) on iOS.

WARNING 2: As described above: by default this plugin uses a non-standard Android-sqlite-connector implementation on Android. In case an application access the same database using multiple plugins there is a risk of data corruption ref: litehelpers/Cordova-sqlite-storage#626) as described in http://ericsink.com/entries/multiple_sqlite_problem.html and https://www.sqlite.org/howtocorrupt.html. The workaround is to use the androidDatabaseImplementation: 2 setting as described in the Android sqlite implementation section below.

To specify a different location (affects iOS/macOS only):

var db = window.sqlitePlugin.openDatabase({name: 'my.db', iosDatabaseLocation: 'Library'}, successcb, errorcb);

where the iosDatabaseLocation option may be set to one of the following choices:

  • default: Library/LocalDatabase subdirectory - NOT visible to iTunes and NOT backed up by iCloud
  • Library: Library subdirectory - backed up by iCloud, NOT visible to iTunes
  • Documents: Documents subdirectory - visible to iTunes and backed up by iCloud

WARNING: Again, the new "default" iosDatabaseLocation value is NOT the same as the old default location and would break an upgrade for an app using the old default value (0) on iOS.

ALTERNATIVE (deprecated):

  • var db = window.sqlitePlugin.openDatabase({name: "my.db", location: 1}, successcb, errorcb);

with the location option set to one the following choices (affects iOS only):

  • 0 (default): Documents - visible to iTunes and backed up by iCloud
  • 1: Library - backed up by iCloud, NOT visible to iTunes
  • 2: Library/LocalDatabase - NOT visible to iTunes and NOT backed up by iCloud (same as using "default")

No longer supported (see tip below to overwrite window.openDatabase): var db = window.sqlitePlugin.openDatabase("myDatabase.db", "1.0", "Demo", -1);

IMPORTANT: Please wait for the 'deviceready' event, as in the following example:

// Wait for Cordova to load
document.addEventListener('deviceready', onDeviceReady, false);

// Cordova is ready
function onDeviceReady() {
  var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'});
  // ...
}

The successcb and errorcb callba

sqliteecosystem:cordovacordova-androidcordova-ioscordova-osxcordova-windows
cordova-sqlite-storage-dependencies
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