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SQL Parser

Parse simple SQL statements into an abstract syntax tree (AST) with the visited tableList and convert it back to SQL
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node-sql-parser
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README

Nodejs SQL Parser

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TypeScript definitions on DefinitelyTyped license

Parse simple SQL statements into an abstract syntax tree (AST) with the visited tableList, columnList and convert it back to SQL.

⭐ Features

  • support multiple sql statement seperate by semicolon
  • support select, delete, update and insert type
  • support drop, truncate and rename command
  • output the table and column list that the sql visited with the corresponding authority
  • support various databases engine

🎉 Install

From npmjs

npm install node-sql-parser --save

or

yarn add node-sql-parser

From GitHub Package Registry

npm install @taozhi8833998/node-sql-parser --registry=https://npm.pkg.github.com/

From Browser

Import the JS file in your page:

// support all database parser, but file size is about 750K
<script src="https://unpkg.com/node-sql-parser/umd/index.umd.js"></script>

// or you can import specified database parser only, it's about 150K

<script src="https://unpkg.com/node-sql-parser/umd/mysql.umd.js"></script>

<script src="https://unpkg.com/node-sql-parser/umd/postgresql.umd.js"></script>
  • NodeSQLParser object is on window
<!DOCTYPE html>
<html lang="en" >
  <head>
    <title>node-sql-parser</title>
    <meta charset="utf-8" />
  </head>
  <body>
    <p><em>Check console to see the output</em></p>
    <script src="https://unpkg.com/node-sql-parser/umd/mysql.umd.js"></script>
    <script>
      window.onload = function () {
        // Example parser
        const parser = new NodeSQLParser.Parser()
        const ast = parser.astify("select id, name from students where age < 18")
        console.log(ast)
        const sql = parser.sqlify(ast)
        console.log(sql)
      }
    </script>
  </body>
</html>

🚀 Usage

Supported Database SQL Syntax

  • Athena
  • BigQuery
  • DB2
  • Hive
  • MariaDB
  • MySQL
  • PostgresQL
  • Redshift
  • Sqlite
  • TransactSQL
  • FlinkSQL
  • Snowflake(alpha)
  • Noql
  • New issue could be made for other new database.

Create AST for SQL statement

// import Parser for all databases
const { Parser } = require('node-sql-parser');
const parser = new Parser();
const ast = parser.astify('SELECT * FROM t'); // mysql sql grammer parsed by default

console.log(ast);
  • ast for SELECT * FROM t
{
  "with": null,
  "type": "select",
  "options": null,
  "distinct": null,
  "columns": "*",
  "from": [
    {
      "db": null,
      "table": "t",
      "as": null
    }
  ],
  "where": null,
  "groupby": null,
  "having": null,
  "orderby": null,
  "limit": null
}

Get node location in the AST

const { Parser } = require('node-sql-parser');
const parser = new Parser();
const ast = parser.astify('SELECT * FROM t', { parseOptions: { includeLocations: true } });

console.log(ast);
  • ast for SELECT * FROM t with the loc property indicating locations and ranges
{
  "with": null,
  "type": "select",
  "options": null,
  "distinct": null,
  "columns": [
    {
      "expr": {
        "type": "column_ref",
        "table": null,
        "column": "*"
      },
      "as": null,
      "loc": {
        "start": {
          "offset": 7,
          "line": 1,
          "column": 8
        },
        "end": {
          "offset": 8,
          "line": 1,
          "column": 9
        }
      }
    }
  ],
  "into": {
    "position": null
  },
  "from": [
    {
      "db": null,
      "table": "t",
      "as": null,
      "loc": {
        "start": {
          "offset": 14,
          "line": 1,
          "column": 15
        },
        "end": {
          "offset": 15,
          "line": 1,
          "column": 16
        }
      }
    }
  ],
  "where": null,
  "groupby": null,
  "having": null,
  "orderby": null,
  "limit": null,
  "locking_read": null,
  "window": null,
  "loc": {
    "start": {
      "offset": 0,
      "line": 1,
      "column": 1
    },
    "end": {
      "offset": 15,
      "line": 1,
      "column": 16
    }
  }
}

Convert AST back to SQL

const opt = {
  database: 'MySQL' // MySQL is the default database
}
// import mysql parser only
const { Parser } = require('node-sql-parser');
const parser = new Parser()
// opt is optional
const ast = parser.astify('SELECT * FROM t', opt);
const sql = parser.sqlify(ast, opt);

console.log(sql); // SELECT * FROM `t`

Parse specified Database

There two ways to parser the specified database.

import Parser from the specified database path node-sql-parser/build/{database}

// import transactsql parser only
const { Parser } = require('node-sql-parser/build/transactsql')
const parser = new Parser()
const sql = `SELECT id FROM test AS result`
const ast = parser.astify(sql)
console.log(parser.sqlify(ast)) // SELECT [id] FROM [test] AS [result]

OR you can pass a options object to the parser, and specify the database property.

const opt = {
  database: 'Postgresql'
}
// import all databases parser
const { Parser } = require('node-sql-parser')
const parser = new Parser()
// pass the opt config to the corresponding methods
const ast = parser.astify('SELECT * FROM t', opt)
const sql = parser.sqlify(ast, opt)
console.log(sql); // SELECT * FROM "t"

Get TableList, ColumnList, Ast by parse function

const opt = {
  database: 'MariaDB' // MySQL is the default database
}
const { Parser } = require('node-sql-parser/build/mariadb');
const parser = new Parser()
// opt is optional
const { tableList, columnList, ast } = parser.parse('SELECT * FROM t', opt);

Get the SQL visited tables

  • get the table list that the sql visited
  • the format is {type}::{dbName}::{tableName} // type could be select, update, delete or insert
const opt = {
  database: 'MySQL'
}
const { Parser } = require('node-sql-parser/build/mysql');
const parser = new Parser();
// opt is optional
const tableList = parser.tableList('SELECT * FROM t', opt);

console.log(tableList); // ["select::null::t"]
  • if the table name is prefixed with database name, the table name will be parsed as dbName::tableName
  • if the table name is prefixed with database and schema name, the table name will be parsed as dbName.schemaName::tableName
  • if the table name is prefixed with server name in TransactSQL, the table name will be parsed as serverName.dbName.schemaName::tableName

Get the SQL visited columns

  • get the column list that the sql visited
  • the format is {type}::{tableName}::{columnName} // type could be select, update, delete or insert
  • for select *, delete and insert into tableName values() without specified columns, the .* column authority regex is required
const opt = {
  database: 'MySQL'
}
const { Parser } = require('node-sql-parser/build/mysql');
const parser = new Parser();
// opt is optional
const columnList = parser.columnList('SELECT t.id FROM t', opt);

console.log(columnList); // ["select::t::id"]

Check the SQL with Authority List

  • check table authority
  • whiteListCheck function check on table mode and MySQL database by default
const { Parser } = require('node-sql-parser');
const parser = new Parser();
const sql = 'UPDATE a SET id = 1 WHERE name IN (SELECT name FROM b)'
const whiteTableList = ['(select|update)::(.*)::(a|b)'] // array that contain multiple authorities
const opt = {
  database: 'MySQL',
  type: 'table',
}
// opt is optional
parser.whiteListCheck(sql, whiteTableList, opt) // if check failed, an error would be thrown with relevant error message, if passed it would return undefined
  • check column authority
const { Parser } = require('node-sql-parser');
const parser = new Parser();
const sql = 'UPDATE a SET id = 1 WHERE name IN (SELECT name FROM b)'
const whiteColumnList = ['select::null::name', 'update::a::id'] // array that contain multiple authorities
const opt = {
  database: 'MySQL',
  type: 'column',
}
// opt is optional
parser.whiteListCheck(sql, whiteColumnList, opt) // if check failed, an error would be thrown with relevant error message, if passed it would return undefined

😘 Acknowledgement

This project is inspired by the SQL parser flora-sql-parser module.

License

Apache-2.0

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