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Druid学习笔记 02、快速使用Druid的SqlParser解析

  • 2026-02-27 00:38:34
Druid学习笔记 02、快速使用Druid的SqlParser解析

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Druid学习笔记 02、快速使用Druid的SqlParser解析

本章节源码

当前文档配套相关源码地址:

  • • gitee:https://gitee.com/changluJava/demo-exer/tree/master/java-sqlparser/demo-druid/demo-druid-simpledemo
  • • github:https://github.com/changluya/Java-Demos/tree/master/java-sqlparser/demo-druid/demo-druid/demo-druid-simpledemo

描述

Druid 本身并没有直接内置完善的血缘解析功能,但我们可以结合 Druid 的数据查询和元数据管理机制,配合一些外部手段实现基本的血缘解析。

认识作者

温绍锦:初心不改的阿里初代开源人:https://gitee.com/gitee-stars/18

官方文档

开源地址:https://github.com/alibaba/druid

学习文档:https://github.com/alibaba/druid/wiki/SQL-Parser

快速入门demo案例

引入依赖

<dependency>    <groupId>com.alibaba</groupId>    <artifactId>druid</artifactId>    <version>1.2.0</version></dependency>

获取到SQL的AST(抽象语法树)

import com.alibaba.druid.sql.ast.SQLStatement;import com.alibaba.druid.sql.parser.SQLParserUtils;import com.alibaba.druid.sql.parser.SQLStatementParser;import com.alibaba.druid.util.JdbcConstants;public class Main {    public static void main(String[] args) {        String sql = "select id, name, age from user;";        SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, JdbcConstants.HIVE);        SQLStatement stmt= parser.parseStatementList().get(0);        System.out.println(stmt);    }}

使用visitor完成表、字段、表达式解析

public static void main(String[] args) throws Exception{    String sql = "select name, age from t_user left join t_user2 on t_user.id = t_user2.id  where t_user.id = 1;";    List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, JdbcConstants.HIVE);    SQLStatement stmt = stmtList.get(0);    // 构建visitor    SchemaStatVisitor statVisitor = SQLUtils.createSchemaStatVisitor(JdbcConstants.HIVE);    stmt.accept(statVisitor);    System.out.println(statVisitor.getColumns()); // [t_user.name, t_user.age, t_user.id]    System.out.println(statVisitor.getTables()); // {t_user=Select}    System.out.println(statVisitor.getConditions()); // [t_user.id = 1]}

汇总总结

下面内容主要参考Druid的学习wiki:https://github.com/alibaba/druid/wiki/SQL-Parser

一、简介

SQL Parser是Druid的一个重要组成部分,Druid内置使用SQL Parser来实现防御SQL注入(WallFilter)、合并统计没有参数化的SQL(StatFilter的mergeSql)、SQL格式化、分库分表。

1.1、和Antlr生成Parser的区别

和Antlr生成的SQL有很大不同的是,Druid SQL Parser性能非常好,可以用于生产环境直接对SQL进行分析处理。

1.2、Druid SQL Parser的使用场景

  • • MySql SQL全量统计
  • • Hive/ODPS SQL执行安全审计
  • • 分库分表SQL解析引擎
  • • 数据库引擎的SQL Parser

二、各种语法支持

Druid的sql parser是目前支持各种数据语法最完备的SQL Parser。目前对各种数据库的支持如下:

数据库
DML
DDL
odps
完全支持
完全支持
mysql
完全支持
完全支持
postgresql
完全支持
完全支持
oracle
支持大部分
支持大部分
sql server
支持常用的
支持常用的ddl
db2
支持常用的
支持常用的ddl
hive
支持常用的
支持常用的ddl

druid还缺省支持sql-92标准的语法,所以也部分支持其他数据库的sql语法。

三、性能

Druid的SQL Parser是手工编写,性能非常好,目标就是在生产环境运行时使用的SQL Parser,性能比antlr、javacc之类工具生成的Parser快10倍甚至100倍以上。

SELECT ID, NAME, AGE FROM USER WHERE ID = ?

这样的SQL,druid parser处理大约是600纳秒,也就是说单线程每秒可以处理1500万次以上。在1.1.3~1.1.4版本中,SQL Parser的性能有极大提升,完全可以适用于生产环境中对SQL进行处理。

四、Druid SQL Parser的代码结构

Druid SQL Parser分三个模块:

  • • Parser
  • • AST
  • • Visitor

4.1、parser

parser是将输入文本转换为ast(抽象语法树),parser有包括两个部分,Parser和Lexer,其中Lexer实现词法分析,Parser实现语法分析。

4.2、AST

AST是Abstract Syntax Tree的缩写,也就是抽象语法树。AST是parser输出的结果。下面是获得抽象语法树的一个例子:

final String dbType = JdbcConstants.MYSQL; // 可以是ORACLE、POSTGRESQL、SQLSERVER、ODPS等String sql = "select * from t";List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, dbType);
  • • Druid SQL AST介绍 https://github.com/alibaba/druid/wiki/Druid_SQL_AST

4.3、Visitor

Visitor是遍历AST的手段,是处理AST最方便的模式,Visitor是一个接口,有缺省什么都没做的实现VistorAdapter。

我们可以实现不同的Visitor来满足不同的需求,Druid内置提供了如下Visitor:

  • • OutputVisitor用来把AST输出为字符串
  • • WallVisitor 来分析SQL语意来防御SQL注入攻击
  • • ParameterizedOutputVisitor用来合并未参数化的SQL进行统计
  • • EvalVisitor 用来对SQL表达式求值
  • • ExportParameterVisitor用来提取SQL中的变量参数
  • • SchemaStatVisitor 用来统计SQL中使用的表、字段、过滤条件、排序表达式、分组表达式
  • • SQL格式化 Druid内置了基于语义的SQL格式化功能【字符串拼接模式完成sql格式化处理】

4.4、自定义Visitor

每种方言的Visitor都有一个缺省的VisitorAdapter,使得编写自定义的Visitor更方便。 https://github.com/alibaba/druid/wiki/SQL_Parser_Demo_visitor

4.5、方言

SQL-92、SQL-99等都是标准SQL,mysql/oracle/pg/sqlserver/odps等都是方言,也就是dialect。parser/ast/visitor都需要针对不同的方言进行特别处理

五、SchemaRepository

Druid SQL Parser内置了一个SchemaRepository,在内存中缓存SQL Schema信息,用于SQL语义解析中的ColumnResolve等操作。 https://github.com/alibaba/druid/wiki/SQL_Schema_Repository

可以基于Druid SQL Parser之上构造Oracle SQL到其他数据的SQL翻译。比如Aliyun提供的Oracle到MySql的SQL翻译功能,就是基于Druid基础上实现的。https://rainbow-expert.aliyun.com/sqltransform.htm


参考文章

[1]. Druid SQL解析原理以及使用(一):https://blog.csdn.net/qq_25104587/article/details/90577646

[2]. 使用Druid的sql parser做一个表数据血缘分析工具:https://www.cnblogs.com/enhe/p/12141686.html

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  1. CONNECT:[ UseTime:0.000543s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000795s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000358s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000352s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000736s ]
  6. SELECT * FROM `set` [ RunTime:0.000302s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000838s ]
  8. SELECT * FROM `article` WHERE `id` = 470715 LIMIT 1 [ RunTime:0.000602s ]
  9. UPDATE `article` SET `lasttime` = 1772304489 WHERE `id` = 470715 [ RunTime:0.000988s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000415s ]
  11. SELECT * FROM `article` WHERE `id` < 470715 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000736s ]
  12. SELECT * FROM `article` WHERE `id` > 470715 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000707s ]
  13. SELECT * FROM `article` WHERE `id` < 470715 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001045s ]
  14. SELECT * FROM `article` WHERE `id` < 470715 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001593s ]
  15. SELECT * FROM `article` WHERE `id` < 470715 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001096s ]
0.112184s