docs: update README
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xiaowei
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NeREADME.md
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# dt-sql-parser
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[![NPM version][npm-image]][npm-url]
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[npm-image]: https://img.shields.io/npm/v/dt-sql-parser.svg?style=flat-square
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[npm-url]: https://www.npmjs.com/package/dt-sql-parser
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## Installation
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## Usage
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### Basic
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### Syntax validation
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### Visitor
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### Listener
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## Example
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## Roadmap
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- Unify parser generate to Antlr4
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- Generic SQL
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- Flink SQL
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- Libra SQL
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- TiDB
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MySQL Compatible Syntax
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## Contributing
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## License
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160
README-zh_CN.md
160
README-zh_CN.md
@ -7,15 +7,9 @@
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[English](./README.md) | 简体中文
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dt-sql-parser 是一个基于 [ANTLR4](https://github.com/antlr/antlr4) 开发的 SQL 解析器集合。主要用于大数据开发中，对各类 SQL 的解析。
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dt-sql-parser 是一个基于 [ANTLR4](https://github.com/antlr/antlr4) 开发的， 针对大数据领域的 `SQL Parser` 项目。通过[ANTLR4](https://github.com/antlr/antlr4) 默认生成的 Parser、Visitor 和 Listener 对象，我们可以轻松的做到对 SQL 语句的`语法检查`（Syntax Validation）、`词法分析`（Tokenizer)、 `遍历 AST` 节点等功能。此外，还提供了几个辅助方法, 例如 SQL 切分（Split）、过滤 SQL 语句中的 `--` 和 `/**/` 等类型的注释。
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每种 SQL 都提供了对应基础类、Visitor 类和 Listener 类，包含了生成 token、生成 AST、语法校验、visitor 和 listener 模式遍历 AST 指定节点等功能。
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此外，为了方便解析，还提供了几个辅助方法可以在解析前对 SQL 进行格式处理。主要作用是清除 SQL 语句中的 '--' 和 '/**/' 两种类型的注释，以及拆分大段 SQL。
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提示：项目中的 grammar 文件也可以通过 [ANTLR4](https://github.com/antlr/antlr4) 编译成其他语言
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目前支持的 SQL：
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已支持的 SQL 类型：
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- MySQL
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- Flink SQL
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@ -23,9 +17,11 @@ dt-sql-parser 是一个基于 [ANTLR4](https://github.com/antlr/antlr4) 开发
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- Hive SQL
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- PL/SQL
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> 提示：当前的 Parser 是 `Javascript` 语言版本，如果有必要，可以尝试编译 Grammar 文件到其他目标语言
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## 安装
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```
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```bash
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// use npm
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npm i dt-sql-parser --save
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@ -33,45 +29,60 @@ npm i dt-sql-parser --save
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yarn add dt-sql-parser
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```
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## 示例
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## 使用
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### Clean
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### 语法校验（Syntax Validation）
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清除注释和前后空格
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首先需要声明想对应的 Parser 对象，不同的 SQL 类型需要引入不同的 Parser 对象处理，例如如果是
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真的 `Flink SQL`, 则需要单独引入 `FlinkSQL` 对象, 这里我们使用 `GenericSQL` 作为示例：
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```javascript
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import { cleanSql } from 'dt-sql-parser';
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import { GenericSQL } from 'dt-sql-parser';
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const sql = `-- comment comment
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select id,name from user1; `
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const cleanedSql = cleanSql(sql)
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console.log(cleanedSql)
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const parser = new GenericSQL();
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const correctSql = 'select id,name from user1;';
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const errors = parser.validate(correctSql);
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console.log(errors);
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```
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输出：
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```javascript
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/*
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select id,name from user1;
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[]
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*/
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```
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### Split
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分割 sql
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校验失败示例：
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```javascript
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import { splitSql } from 'dt-sql-parser';
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const incorrectSql = 'selec id,name from user1;'
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const errors = parser.validate(incorrectSql);
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console.log(errors);
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```
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const sql = `select id,name from user1;
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select id,name from user2;`
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const sqlList = splitSql(sql)
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console.log(sqlList)
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输出：
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```javascript
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/*
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["select id,name from user1;", "\nselect id,name from user2;"]
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[
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{
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endCol: 5,
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endLine: 1,
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startCol: 0,
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startLine: 1,
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message: "mismatched input 'SELEC' expecting {<EOF>, 'ALTER', 'ANALYZE', 'CALL', 'CHANGE', 'CHECK', 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DROP', 'EXPLAIN', 'GET', 'GRANT', 'INSERT', 'KILL', 'LOAD', 'LOCK', 'OPTIMIZE', 'PURGE', 'RELEASE', 'RENAME', 'REPLACE', 'RESIGNAL', 'REVOKE', 'SELECT', 'SET', 'SHOW', 'SIGNAL', 'UNLOCK', 'UPDATE', 'USE', 'BEGIN', 'BINLOG', 'CACHE', 'CHECKSUM', 'COMMIT', 'DEALLOCATE', 'DO', 'FLUSH', 'HANDLER', 'HELP', 'INSTALL', 'PREPARE', 'REPAIR', 'RESET', 'ROLLBACK', 'SAVEPOINT', 'START', 'STOP', 'TRUNCATE', 'UNINSTALL', 'XA', 'EXECUTE', 'SHUTDOWN', '--', '(', ';'}"
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}
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]
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*/
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```
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### Tokens
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先实例化 Parser 对象，然后使用 `validate` 方法对 SQL 语句进行校验，如果校验失败，则返回一个包含 `Error` 信息的数组。
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对 sql 语句进行词法分析，生成 token
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### 词法分析（Tokenizer）
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必要场景下，可单独对 SQL 语句进行词法分析，获取所有的 Tokens 对象：
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```javascript
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import { GenericSQL } from 'dt-sql-parser';
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@ -99,47 +110,9 @@ console.log(tokens)
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*/
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```
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### Syntax validation
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### 访问者模式（Visitor）
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validate 方法对 sql 语句的语法正确性进行校验，返回一个由 error 组成的数组
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```javascript
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import { GenericSQL } from 'dt-sql-parser';
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const validate = (sql) => {
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const parser = new GenericSQL()
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const errors = parser.validate(sql)
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console.log(errors)
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}
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```
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语法正确的 sql:
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```javascript
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const correctSql = 'select id,name from user1;'
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validate(correctSql)
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/*
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[]
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*/
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```
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包含错误语法的 sql:
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```javascript
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const incorrectSql = 'selec id,name from user1;'
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validate(incorrectSql)
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/*
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[
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{
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endCol: 5,
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endLine: 1,
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startCol: 0,
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startLine: 1,
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message: "mismatched input 'SELEC' expecting {<EOF>, 'ALTER', 'ANALYZE', 'CALL', 'CHANGE', 'CHECK', 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DROP', 'EXPLAIN', 'GET', 'GRANT', 'INSERT', 'KILL', 'LOAD', 'LOCK', 'OPTIMIZE', 'PURGE', 'RELEASE', 'RENAME', 'REPLACE', 'RESIGNAL', 'REVOKE', 'SELECT', 'SET', 'SHOW', 'SIGNAL', 'UNLOCK', 'UPDATE', 'USE', 'BEGIN', 'BINLOG', 'CACHE', 'CHECKSUM', 'COMMIT', 'DEALLOCATE', 'DO', 'FLUSH', 'HANDLER', 'HELP', 'INSTALL', 'PREPARE', 'REPAIR', 'RESET', 'ROLLBACK', 'SAVEPOINT', 'START', 'STOP', 'TRUNCATE', 'UNINSTALL', 'XA', 'EXECUTE', 'SHUTDOWN', '--', '(', ';'}"
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}
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]
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*/
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```
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### Visitor
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使用 visitor 模式访问 AST 中的指定节点
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使用 Visitor 模式访问 AST 中的指定节点
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```javascript
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import { GenericSQL, SqlParserVisitor } from 'dt-sql-parser';
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@ -169,11 +142,12 @@ TableName user1
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*/
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```
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提示：使用 Visitor 模式时，节点的方法名称可以在对应 SQL 目录下的 Visitor 文件中查找
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### Listener
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> 提示：使用 Visitor 模式时，节点的方法名称可以在对应 SQL 目录下的 Visitor 文件中查找
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listener 模式，利用 [ANTLR4](https://github.com/antlr/antlr4) 提供的 ParseTreeWalker 对象遍历 AST，进入各个节点时调用对应的方法。
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### 监听器（Listener）
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Listener 模式，利用 [ANTLR4](https://github.com/antlr/antlr4) 提供的 ParseTreeWalker 对象遍历 AST，进入各个节点时调用对应的方法。
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```javascript
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import { GenericSQL, SqlParserListener } from 'dt-sql-parser';
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@ -202,11 +176,47 @@ TableName user1
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```
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提示：使用 Listener 模式时，节点的方法名称可以在对应 SQL 目录下的 Listener 文件中查找
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> 提示：使用 Listener 模式时，节点的方法名称可以在对应 SQL 目录下的 Listener 文件中查找
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### 其他
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### 清理注释内容
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- parserTreeToString (将 SQL 解析成 AST，再转成 string 形式)
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清除注释和前后空格
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```javascript
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import { cleanSql } from 'dt-sql-parser';
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const sql = `-- comment comment
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select id,name from user1; `
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const cleanedSql = cleanSql(sql)
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console.log(cleanedSql)
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/*
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select id,name from user1;
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*/
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```
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### 切割 SQL （Split）
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SQL 太大的情况下，我们可以先将SQL语句按 `;` 切割，然后逐句处理。
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```javascript
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import { splitSql } from 'dt-sql-parser';
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const sql = `select id,name from user1;
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select id,name from user2;`
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const sqlList = splitSql(sql)
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console.log(sqlList)
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/*
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["select id,name from user1;", "\nselect id,name from user2;"]
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*/
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```
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### 其他 API
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- parserTreeToString (input: string)
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将 SQL 解析成 `List-like` 风格的树形字符串， 一般用于测试
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## 路线图
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155
README.md
155
README.md
@ -2,18 +2,16 @@
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[![NPM version][npm-image]][npm-url]
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English | [简体中文](./README-zh_CN.md)
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[npm-image]: https://img.shields.io/npm/v/dt-sql-parser.svg?style=flat-square
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[npm-url]: https://www.npmjs.com/package/dt-sql-parser
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English | [简体中文](./README-zh_CN.md)
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dt-sql-parser is a `SQL Parser` project built with [ANTLR4](https://github.com/antlr/antlr4), and it's mainly for the `BigData` domain. The [ANTLR4](https://github.com/antlr/antlr4) generated the basic Parser, Visitor, and Listener, so it's easy to complete `validate`, `tokenize`, `traverse` the AST, and so on features.
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dt-sql-parser is a collection of SQL parsers developed based on [ANTLR4](https://github.com/antlr/antlr4) .It's mainly used for parsing all kinds of SQL in the development of big data.
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Besides, it' provides some helper methods, like `split` SQL, and filter the `--` and `/**/` types of comments in SQL.
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It provides the basic class, Visitor class, and Listener class. These class including the ability to generate tokens, generate parse tree, syntax validation, and Visitor & Listener patterns to traverse the AST.
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In addition, several helper methods are provided to format the SQL before parsing. The main effect is to clear the '--' and '/**/' types of comments in SQL statements, and to split large chunks of SQL
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tips: The Grammar file can also be compiled into other languages with [ANTLR4](https://github.com/antlr/antlr4) .
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> Tips: This project is the default for Javascript language, also you can try to compile it to other languages if you need.
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Supported SQL:
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@ -25,7 +23,7 @@ Supported SQL:
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## Installation
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```
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```bash
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// use npm
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npm i dt-sql-parser --save
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@ -35,43 +33,61 @@ yarn add dt-sql-parser
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## Usage
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### Clean
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### Syntax Validation
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clear comments and Spaces before and after
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First, we need to import the `Parser` object from `dt-sql-parser`, the different language needs
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different Parser, so if you need to handle the `Flink SQL`, you can import the `FlinkSQL Parser`.
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The below is a `GenericSQL Parser` example:
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```javascript
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import { cleanSql } from 'dt-sql-parser';
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import { GenericSQL } from 'dt-sql-parser';
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const sql = `-- comment comment
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select id,name from user1; `
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const cleanedSql = cleanSql(sql)
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console.log(cleanedSql)
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const parser = new GenericSQL();
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const correctSql = 'select id,name from user1;';
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const errors = parser.validate(correctSql);
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console.log(errors);
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```
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output:
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```javascript
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/*
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select id,name from user1;
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[]
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*/
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```
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### Split
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split sql
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validate failed:
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```javascript
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import { splitSql } from 'dt-sql-parser';
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const incorrectSql = 'selec id,name from user1;'
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const errors = parser.validate(incorrectSql);
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console.log(errors);
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```
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const sql = `select id,name from user1;
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select id,name from user2;`
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const sqlList = splitSql(sql)
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console.log(sqlList)
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output:
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```javascript
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/*
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["select id,name from user1;", "\nselect id,name from user2;"]
|
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[
|
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{
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endCol: 5,
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endLine: 1,
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startCol: 0,
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startLine: 1,
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message: "mismatched input 'SELEC' expecting {<EOF>, 'ALTER', 'ANALYZE', 'CALL', 'CHANGE', 'CHECK', 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DROP', 'EXPLAIN', 'GET', 'GRANT', 'INSERT', 'KILL', 'LOAD', 'LOCK', 'OPTIMIZE', 'PURGE', 'RELEASE', 'RENAME', 'REPLACE', 'RESIGNAL', 'REVOKE', 'SELECT', 'SET', 'SHOW', 'SIGNAL', 'UNLOCK', 'UPDATE', 'USE', 'BEGIN', 'BINLOG', 'CACHE', 'CHECKSUM', 'COMMIT', 'DEALLOCATE', 'DO', 'FLUSH', 'HANDLER', 'HELP', 'INSTALL', 'PREPARE', 'REPAIR', 'RESET', 'ROLLBACK', 'SAVEPOINT', 'START', 'STOP', 'TRUNCATE', 'UNINSTALL', 'XA', 'EXECUTE', 'SHUTDOWN', '--', '(', ';'}"
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}
|
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]
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*/
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```
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### Tokens
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We instanced a Parser object, and use the `validate` method to check the SQL syntax, if failed
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returns an array object includes `error` message.
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lexical analysis, generate token
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### Tokenizer
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|
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You can also the all `tokens` by the Parser:
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|
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```javascript
|
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import { GenericSQL } from 'dt-sql-parser';
|
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@ -99,47 +115,9 @@ console.log(tokens)
|
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*/
|
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```
|
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|
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### Syntax validation
|
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|
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verifies the syntax correctness of the SQL statement and returns an array of errors
|
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|
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```javascript
|
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import { GenericSQL } from 'dt-sql-parser';
|
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|
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const validate = (sql) => {
|
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const parser = new GenericSQL()
|
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const errors = parser.validate(sql)
|
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console.log(errors)
|
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}
|
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```
|
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correct sql:
|
||||
```javascript
|
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const correctSql = 'select id,name from user1;'
|
||||
validate(correctSql)
|
||||
/*
|
||||
[]
|
||||
*/
|
||||
```
|
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incorrect sql:
|
||||
```javascript
|
||||
const incorrectSql = 'selec id,name from user1;'
|
||||
validate(incorrectSql)
|
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/*
|
||||
[
|
||||
{
|
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endCol: 5,
|
||||
endLine: 1,
|
||||
startCol: 0,
|
||||
startLine: 1,
|
||||
message: "mismatched input 'SELEC' expecting {<EOF>, 'ALTER', 'ANALYZE', 'CALL', 'CHANGE', 'CHECK', 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DROP', 'EXPLAIN', 'GET', 'GRANT', 'INSERT', 'KILL', 'LOAD', 'LOCK', 'OPTIMIZE', 'PURGE', 'RELEASE', 'RENAME', 'REPLACE', 'RESIGNAL', 'REVOKE', 'SELECT', 'SET', 'SHOW', 'SIGNAL', 'UNLOCK', 'UPDATE', 'USE', 'BEGIN', 'BINLOG', 'CACHE', 'CHECKSUM', 'COMMIT', 'DEALLOCATE', 'DO', 'FLUSH', 'HANDLER', 'HELP', 'INSTALL', 'PREPARE', 'REPAIR', 'RESET', 'ROLLBACK', 'SAVEPOINT', 'START', 'STOP', 'TRUNCATE', 'UNINSTALL', 'XA', 'EXECUTE', 'SHUTDOWN', '--', '(', ';'}"
|
||||
}
|
||||
]
|
||||
*/
|
||||
```
|
||||
|
||||
### Visitor
|
||||
|
||||
access the specified node in the AST by Visitor pattern
|
||||
Traverse the tree node by the Visitor:
|
||||
|
||||
```javascript
|
||||
import { GenericSQL, SqlParserVisitor } from 'dt-sql-parser';
|
||||
@ -169,7 +147,8 @@ TableName user1
|
||||
*/
|
||||
|
||||
```
|
||||
tips: The node's method name can be found in the Visitor file under the corresponding SQL directory
|
||||
|
||||
> Tips: The node's method name can be found in the Visitor file under the corresponding SQL directory
|
||||
|
||||
### Listener
|
||||
|
||||
@ -202,11 +181,47 @@ TableName user1
|
||||
|
||||
```
|
||||
|
||||
tips: The node's method name can be found in the Listener file under the corresponding SQL directory
|
||||
> Tips: The node's method name can be found in the Listener file under the corresponding SQL directory
|
||||
|
||||
### Other
|
||||
### Clean
|
||||
|
||||
- parserTreeToString (parse the SQL into AST and turn it into a String)
|
||||
Clear the `comments` and `spaces` before and after
|
||||
|
||||
```javascript
|
||||
import { cleanSql } from 'dt-sql-parser';
|
||||
|
||||
const sql = `-- comment comment
|
||||
select id,name from user1; `
|
||||
const cleanedSql = cleanSql(sql)
|
||||
console.log(cleanedSql)
|
||||
|
||||
/*
|
||||
select id,name from user1;
|
||||
*/
|
||||
```
|
||||
|
||||
### Split SQL
|
||||
|
||||
When the SQL text is very big, you can think about to split it by `;` , and handle each line.
|
||||
|
||||
```javascript
|
||||
import { splitSql } from 'dt-sql-parser';
|
||||
|
||||
const sql = `select id,name from user1;
|
||||
select id,name from user2;`
|
||||
const sqlList = splitSql(sql)
|
||||
console.log(sqlList)
|
||||
|
||||
/*
|
||||
["select id,name from user1;", "\nselect id,name from user2;"]
|
||||
*/
|
||||
```
|
||||
|
||||
### Other API
|
||||
|
||||
- parserTreeToString(input: string)
|
||||
|
||||
Parse the input and convert the AST to a `List-like` tree string.
|
||||
|
||||
## Roadmap
|
||||
|
||||
|
||||
Reference in New Issue
Block a user