org.aoju.bus.starter.mapper

Class IllegalSQLHandler

java.lang.Object

org.aoju.bus.mapper.handlers.AbstractSqlHandler

org.aoju.bus.starter.mapper.AbstractSqlParserHandler

org.aoju.bus.starter.mapper.IllegalSQLHandler

All Implemented Interfaces:

org.apache.ibatis.plugin.Interceptor

@Intercepts(value=@Signature(type=org.apache.ibatis.executor.statement.StatementHandler.class,method="prepare",args={java.sql.Connection.class,java.lang.Integer.class}))
public class IllegalSQLHandler
extends AbstractSqlParserHandler
implements org.apache.ibatis.plugin.Interceptor

由于开发人员水平参差不齐，即使订了开发规范很多人也不遵守

SQL是影响系统性能最重要的因素，所以拦截掉垃圾SQL语句

拦截SQL类型的场景

1.必须使用到索引，包含left jion连接字段，符合索引最左原则

必须使用索引好处，

1.1 如果因为动态SQL，bug导致update的where条件没有带上，全表更新上万条数据

1.2 如果检查到使用了索引，SQL性能基本不会太差

2.SQL尽量单表执行，有查询left jion的语句，必须在注释里面允许该SQL运行，否则会被拦截

SQL尽量单表执行的好处

2.1 查询条件简单、易于开理解和维护；

2.2 扩展性极强；(可为分库分表做准备)

2.3 缓存利用率高；

2.在字段上使用函数

3.where条件为空

4.where条件使用了 !=

5.where条件使用了 not 关键字

6.where条件使用了 or 关键字

7.where条件使用了 使用子查询

Since:

JDK 1.8+

Version:

6.2.8

Author:

Kimi Liu

Field Summary

Fields inherited from class org.aoju.bus.mapper.handlers.AbstractSqlHandler

DELEGATE_BOUNDSQL, DELEGATE_BOUNDSQL_SQL, DELEGATE_MAPPEDSTATEMENT, MAPPEDSTATEMENT

Constructor Summary

Constructors

Constructor and Description
IllegalSQLHandler()

Method Summary

Modifier and Type	Method and Description
Object	intercept(org.apache.ibatis.plugin.Invocation invocation)
Object	plugin(Object object)

Methods inherited from class org.aoju.bus.starter.mapper.AbstractSqlParserHandler

allowProcess, doFilter, parser, processDelete, processInsert, processParser, processSelectBody, processUpdate

Methods inherited from class org.aoju.bus.mapper.handlers.AbstractSqlHandler

getMappedStatement, getMappedStatement, getSqlParserInfo, realTarget

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.ibatis.plugin.Interceptor

setProperties

Constructor Detail

IllegalSQLHandler

public IllegalSQLHandler()

Method Detail

intercept

public Object intercept(org.apache.ibatis.plugin.Invocation invocation)
                 throws Throwable

Specified by:

intercept in interface org.apache.ibatis.plugin.Interceptor

Throws:

Throwable

plugin

public Object plugin(Object object)

Specified by:

plugin in interface org.apache.ibatis.plugin.Interceptor