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mybatis核心组件

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title: “mybatis核心组件”
createTime: 2021-12-08T12:19:57+08:00
updateTime: 2021-12-08T12:19:57+08:00
draft: false
author: “ggball”
tags: [“mybatis”]
categories: [“java”]
description: “mybatis核心组件”

image-20211031125517372

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configuration
mappedStatement2
mappedStatement1

configuration:

MyBatis框架的配置信息有两种，一种是配置MyBatis框架属性的主配置文件；另一种是配置执行SQL语句的Mapper配置文件。Configuration的作用是描述MyBatis主配置文件的信息

个人理解：

作为注册信息的载体，各种属性开关，Configuration组件还作为Executor、StatementHandler、ResultSetHandler、ParameterHandler组件的工厂类，用于创建这些组件的实例

excutor

createTime: 2021-12-08T12:19:57+08:00
updateTime: 2021-12-08T12:19:57+08:00

MappedStatement

createTime: 2021-12-08T12:19:57+08:00
updateTime: 2021-12-08T12:19:57+08:00

StatementHandler

StatementHandler组件封装了对JDBC Statement的操作，例如设置Statement对象的fetchSize属性、设置查询超时时间、调用JDBC Statement与数据库交互等。

TypeHandler

处理JDBC类型与Java类型之间的转换

ParameterHandler

如果SQL语句中有参数占位符，在执行SQL语句之前，就需要为参数占位符设置值。ParameterHandler的作用是在PreparedStatementHandler和CallableStatementHandler操作对应的Statement执行数据库交互之前为参数占位符设置值

ResultSetHandler

ResultSetHandler用于在StatementHandler对象执行完查询操作或存储过程后，对结果集或存储过程的执行结果进行处理

��行完查询操作或存储过程后，对结果集或存储过程的执行结果进行处理

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