update docs
This commit is contained in:
xigua
@ -204,7 +204,7 @@ TableName user1
|
||||
|
||||
### 其他
|
||||
|
||||
- parserTreeToString 将 SQL 解析成 AST，再转成 string 形式
|
||||
- parserTreeToString (将 SQL 解析成 AST，再转成 string 形式)
|
||||
|
||||
## 路线图
|
||||
|
||||
|
||||
44
README.md
44
README.md
@ -5,7 +5,7 @@
|
||||
[npm-image]: https://img.shields.io/npm/v/dt-sql-parser.svg?style=flat-square
|
||||
[npm-url]: https://www.npmjs.com/package/dt-sql-parser
|
||||
|
||||
此项目是基于 [ANTLR4](https://github.com/antlr/antlr4) 开发的 SQL 语言解析器。主要用于大数据开发中，对各类 SQL 的解析。目前支持的 SQL：
|
||||
dt-sql-parser is a SQL parser built on [ANTLR4](https://github.com/antlr/antlr4) .It's mainly used for analyzing all kinds of SQL in the development of big data. Supported SQL:
|
||||
|
||||
- MySQL
|
||||
- Flink SQL
|
||||
@ -13,15 +13,15 @@
|
||||
- Hive SQL
|
||||
- PL/SQL
|
||||
|
||||
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。
|
||||
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.
|
||||
|
||||
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。
|
||||
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
|
||||
|
||||
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
|
||||
tips: The Grammar file can also be compiled into other languages with [ANTLR4](https://github.com/antlr/antlr4) .
|
||||
|
||||
[English](./README.md) | 简体中文
|
||||
|
||||
## 安装
|
||||
## Installation
|
||||
|
||||
```
|
||||
// use npm
|
||||
@ -31,11 +31,11 @@ npm i dt-sql-parser --save
|
||||
yarn add dt-sql-parser
|
||||
```
|
||||
|
||||
## 示例
|
||||
## Usage
|
||||
|
||||
### Clean
|
||||
|
||||
清除注释和前后空格
|
||||
clear comments and Spaces before and after
|
||||
|
||||
```javascript
|
||||
import { cleanSql } from 'dt-sql-parser';
|
||||
@ -52,7 +52,7 @@ select id,name from user1;
|
||||
|
||||
### Split
|
||||
|
||||
分割 sql
|
||||
split sql
|
||||
|
||||
```javascript
|
||||
import { splitSql } from 'dt-sql-parser';
|
||||
@ -69,7 +69,7 @@ console.log(sqlList)
|
||||
|
||||
### Tokens
|
||||
|
||||
对 sql 语句进行词法分析，生成 token
|
||||
lexical analysis, generate token
|
||||
|
||||
```javascript
|
||||
import { GenericSQL } from 'dt-sql-parser';
|
||||
@ -99,7 +99,7 @@ console.log(tokens)
|
||||
|
||||
### Syntax validation
|
||||
|
||||
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
|
||||
verifies the syntax correctness of the SQL statement and returns an array of errors
|
||||
|
||||
```javascript
|
||||
import { GenericSQL } from 'dt-sql-parser';
|
||||
@ -110,7 +110,7 @@ const validate = (sql) => {
|
||||
console.log(errors)
|
||||
}
|
||||
```
|
||||
语法正确的 sql:
|
||||
correct sql:
|
||||
```javascript
|
||||
const correctSql = 'select id,name from user1;'
|
||||
validate(correctSql)
|
||||
@ -118,7 +118,7 @@ validate(correctSql)
|
||||
[]
|
||||
*/
|
||||
```
|
||||
包含错误语法的 sql:
|
||||
incorrect sql:
|
||||
```javascript
|
||||
const incorrectSql = 'selec id,name from user1;'
|
||||
validate(incorrectSql)
|
||||
@ -137,7 +137,7 @@ validate(incorrectSql)
|
||||
|
||||
### Visitor
|
||||
|
||||
使用 visitor 模式访问 AST 中的指定节点
|
||||
access the specified node in the AST by Visitor pattern
|
||||
|
||||
```javascript
|
||||
import { GenericSQL, SqlParserVisitor } from 'dt-sql-parser';
|
||||
@ -147,12 +147,12 @@ const sql = `select id,name from user1;`
|
||||
// parseTree
|
||||
const tree = parser.parse(sql)
|
||||
class MyVisitor extends SqlParserVisitor {
|
||||
// 重写 visitTableName 方法
|
||||
// overwrite visitTableName
|
||||
visitTableName(ctx) {
|
||||
let tableName = ctx.getText().toLowerCase()
|
||||
console.log('TableName', tableName)
|
||||
}
|
||||
// 重写 visitSelectElements 方法
|
||||
// overwrite visitSelectElements
|
||||
visitSelectElements(ctx) {
|
||||
let selectElements = ctx.getText().toLowerCase()
|
||||
console.log('SelectElements', selectElements)
|
||||
@ -167,11 +167,11 @@ TableName user1
|
||||
*/
|
||||
|
||||
```
|
||||
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
|
||||
tips: The node's method name can be found in the Visitor file under the corresponding SQL directory
|
||||
|
||||
### Listener
|
||||
|
||||
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。
|
||||
access the specified node in the AST by Listener pattern
|
||||
|
||||
```javascript
|
||||
import { GenericSQL, SqlParserListener } from 'dt-sql-parser';
|
||||
@ -200,17 +200,17 @@ TableName user1
|
||||
|
||||
```
|
||||
|
||||
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
|
||||
tips: The node's method name can be found in the Listener file under the corresponding SQL directory
|
||||
|
||||
### 其他
|
||||
### Other
|
||||
|
||||
- parserTreeToString 将 SQL 解析成 AST，再转成 string 形式
|
||||
- parserTreeToString (parse the SQL into AST and turn it into a String)
|
||||
|
||||
## 路线图
|
||||
## Roadmap
|
||||
|
||||
- Auto-complete
|
||||
- Impala SQL
|
||||
|
||||
## 许可证
|
||||
## License
|
||||
|
||||
[MIT](./LICENSE)
|
||||
Reference in New Issue
Block a user