easy-psql v0.1.23
easy-psql
Description
Welcome to the easy-psql documentation! easy-psql is a simple intermediary for querying data in PostgreSQL databases. Whether you're a beginner or an experienced developer, this documentation will help you get started with easy-psql and leverage its capabilities to interact with your PostgreSQL databases efficiently.
Note: This package is intended for personal usage, and no tests have been written for it. Therefore, it is recommended to use it with caution and at your own responsibility. Like any software, there may be unforeseen bugs or issues that could affect your application. It is advisable to thoroughly review the package's functionality and integrate it into your projects with careful consideration of potential risks. (This package was developed using nodejs 16)
Installation
To install easy-psql, you can use npm:
npm install easy-psql
Establishing Connection with PostgreSQL Database
const { DB } = require("easy-psql");
DB.registerConnectionConfig({
user: "postgres",
database: "postgres",
schema: "public",
password: "postgres",
port: 5432,
host: "localhost",
});
Defining Models and Relations for PostgreSQL Database
const { Model, Column } = require("easy-psql");
class Role extends Model {
constructor(connection) {
super("roles", connection);
}
columns = {
id: new Column({
name: "id",
type: "uuid",
primary: true,
defaultValue: "gen_random_uuid()",
}),
name: new Column({
name: "name",
type: "text",
nullable: false,
}),
};
}
class User extends Model {
constructor(connection) {
super("users", connection);
}
columns = {
id: new Column({
name: "id",
type: "uuid",
primary: true,
defaultValue: "gen_random_uuid()",
}),
role_id: new Column({
name: "role_id",
type: "uuid",
}),
email: new Column({
name: "email",
type: "text",
unique: true,
}),
password: new Column({
name: "password",
type: "text",
nullable: false,
}),
grid_order: new Column({
name: "grid_order",
type: "int",
nullable: false,
defaultValue: 1,
}),
};
relations = {
role: new Relation({
from_table: "users",
from_column: "role_id",
to_table: "roles",
to_column: "id",
alias: "object", // object or array
}),
};
}
// Register the models in order to be able to use relations
DB.register(User);
DB.regitser(Role);
Basic examples
const model = new User();
const data = await model.find() // multiple rows
const data = await model.findOne() // single row
const data = await model.create({email:'example@example.com',password:'12345678'});
const data = await model.createMany([{email:'example@example.com',password:'12345678'},{email:'example2@example.com',password:'12345678'}])
const data = await model.update({where:{...},update:{email:'example@updated.com'}});
const data = await model.delete({where: {...}});
const {count,max} = await model.aggregate({_count:true,max:{email:true},where:{...}}) // _count,max,min,sum,avg
Use Relations
const model = new User();
const usersWithRoles = await model.find({ include: { role: true } });
Use Relations With Filters
const model = new User();
const usersWithRoles = await model.find({ include: { role: {where:{...}} } });
Basic Filtering Example
const model = new User();
const data = await model.find({
where: { email: { _eq: "example@example.com" } },
});
Basic Filtering Operators
const model = new User();
const data = await model.find({
where: {
password: { _in: ["12345678", "123456789"] },
email: { _eq: "test@example.com" },
_or: [{ password: { _is_not: null } }, { password: { _is: null } }],
_and: [
{ grid_order: { _lte: 200 } },
{ grid_order: { _lt: 201 } },
{ grid_order: { _gte: 1 } },
{ grid_order: { _gt: 0 } },
{ password: { _nin: ["12345678", "123456789"] } },
{ email: { _ilike: "test" } },
{ email: { _neq: "test2@example.com" } },
{
_or: [
{ password: { _is_not: null } },
{ password: { _is: null } },
{
_and: [
{ email: { _neq: "test2@example.com" } },
{
_or: [
{ password: { _is_not: null } },
{ password: { _is: null } },
],
},
],
},
],
},
],
},
});
Basic Filtering Operators Are Applied to Relations too
const model = new User();
const data = await model.find({
where: {
password: { _eq_: "12345678" },
email: { _eq: "test@example.com" },
// this is the role related entity
role: {
name: { _eq: "admin" },
},
},
});
Other Operators
const model = new Role();
const data = await model.find({where:{...},distinct:[...],groupBy:[...],limit:100,offset:0,orderBy: {
name: 'asc',
users_aggregate:{
_count:true
}
}})
Using nested aggregations
const { Model, Column } = require("easy-psql");
class Role extends Model {
constructor(connection) {
super("roles", connection);
}
columns = {
id: new Column({
name: "id",
type: "uuid",
primary: true,
defaultValue: "gen_random_uuid()",
}),
name: new Column({
name: "name",
type: "text",
nullable: false,
}),
};
relations = {
role: new Relation({
from_table: "roles",
from_column: "id",
to_table: "users",
to_column: "role_id",
alias: "array", // object or array
}),
};
}
class User extends Model {
constructor(connection) {
super("users", connection);
}
columns = {
id: new Column({
name: "id",
type: "uuid",
primary: true,
defaultValue: "gen_random_uuid()",
}),
role_id: new Column({
name: "role_id",
type: "uuid",
}),
email: new Column({
name: "email",
type: "text",
unique: true,
}),
password: new Column({
name: "password",
type: "text",
nullable: false,
}),
grid_order: new Column({
name: "grid_order",
type: "int",
nullable: false,
defaultValue: 1,
}),
};
relations = {
role: new Relation({
from_table: "users",
from_column: "role_id",
to_table: "roles",
to_column: "id",
alias: "object", // object or array
}),
};
}
// Register the models in order to be able to use relations
DB.register(User);
DB.regitser(Role);
const model = new Role();
const role = await model.findOne({
where: { name: { _eq: "admin" } },
include: {
users_aggregate: {
// _count,max,min,avg,sum
_count: true,
max: { grid_order: true },
min: { grid_order: true, email: true },
// you can use where inside here
},
},
});
Using multiple nested relations
const model = new User();
const data = await model.find({
include: {
role: {
include: {
users: {
include: {
role: true, // .....
},
},
},
},
},
});
Transactions Example 1
const model = new User();
const result = await model.withTransaction(async (tx) => {
const newUser = await model.create({
email: "test@test2.com",
password: "12345678",
role_id: "...",
});
if (!newUser) {
throw new Error("User not created");
}
return newUser;
});
// Errors inside withTransaction will use rollback; otherwise a commit is performed
// Check the result
if (result instanceof Error) {
console.error(result);
} else {
console.log(result);
}
Transactions Example 2
const model = new User();
const result = await model.withTransaction(async (tx) => {
const newUser = await model.create({
email: "test@test2.com",
password: "12345678",
role_id: "...",
});
if (!newUser) {
throw new Error("User not created");
}
const roleModel = new Role(tx); // pass the tx -> connection to postgres otherwise this operation is not be atomic
const roleData = await role.create({ name: "testRole" });
if (!roleData) {
throw new Error("Role not created");
}
return [newUser, roleData];
});
// Errors inside withTransaction will use rollback; otherwise a commit is performed
// Check the result
if (result instanceof Error) {
console.error(result);
} else {
console.log(result);
}
Transactions Example 3
const model = new Role();
const inputData = {
name: "newRole",
users: [
{ email: "newUser@newRole.com", password: "12345678" },
{ email: "newUser2@newRole.com", password: "12345678" },
],
};
// Over here perform the createTX operation
const result = await model.createTX(inputData);
// or for multiple inserts use await model.createManyTX([inputData]) -> use an array of objects
// The roles.id generated from this query will be assigned to each users.role_id field
Register Effects
// The following events will be triggered only by using the model classes
// e.g : find and findOne on model User -> will trigger onSelectAsync but DB.pool.query('select * from users'); will not!
DB.onSelectAsync("users", async (data, instance) => {
// ...
});
DB.onInsertAsync("users", async (data, instance) => {
// ...
});
DB.onUpdateAsync("users", async (data, instance) => {
// ...
});
DB.onDeleteAsync("users", async (data, instance) => {
// ...
});
DB.onErrorAsync("users", async (error, instance) => {
// ...
});
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