iabtis初探

Posted 2020-06-30 沙中世界

1、简介

　　与Hibernate相比，ibatis属于一种半自动的ORM框架，主要解决了java对象与SQL入参及结果集的映射关系。简单易学、容易上手；但是安全性较差，对于金融等对安全要求较高的系统来说，不推荐使用。

2、代码

　　首先看一下简单应用

　　project的结构

　　

　　ibatis.xml 记录了JDBC连接数据库所需的信息

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMapConfig      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">
<sqlMapConfig>
    <transactionManager type = "JDBC" >
        <dataSource type = "SIMPLE" >
            <property name="JDBC.Driver" value="com.mysql.jdbc.Driver"/>
            <property name="JDBC.ConnectionURL" value="jdbc:mysql://192.168.61.28/mytest"/>
            <property name="JDBC.Username" value="encysys48"/>
            <property name="JDBC.Password" value="encysys48"/>
        </dataSource>
    </transactionManager>
    <sqlMap resource = "com/jiexun/xml/user.xml" />
</sqlMapConfig>

ibatis.xml

　　user.xml 记录了操作数据库的语句

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap>
    <typeAlias alias = "user" type = "com.jiexun.User" />
    <select id="getUser" parameterClass = "int" resultClass="user">
        select * from user where user.id = #id#
    </select>
    
    <!-- 对象传参 user的属性中有id name 成员变量 -->
    <insert id="addUser" parameterClass="user">
        insert into user values(#id#,#name#)
    </insert>
    
    <!-- Map传参 -->
    <insert id="addUser2" parameterClass="java.util.HashMap">
        insert into user values(#id#,#name#)
    </insert>
</sqlMap>

user.xml

package com.jiexun;

public class User {
    public int id;
    public String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

com.jiexun.User

import java.io.Reader;
import java.util.HashMap;
import java.util.List;

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.jiexun.User;


public class testIbatis {

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception{
        // TODO Auto-generated method stub
        int id = 1001;
        User newUser = new User();
        newUser.setId(1001);
        newUser.setName("LS");
        
        String config = "com/jiexun/xml/ibatis.xml";
        Reader reader = Resources.getResourceAsReader(config);   
        SqlMapClient sqlMap = SqlMapClientBuilder.buildSqlMapClient(reader);  
        //对象传参 插入
        Object obj = sqlMap.insert("addUser",newUser);
        System.out.println("插入新用户返回值：" + obj);
        
        //Map传参 插入
        HashMap paraMap = new HashMap<String, Object>();
        paraMap.put("id", "1002");
        paraMap.put("name", "WWN");
        Object obj2 =sqlMap.insert("addUser2",paraMap);
        
        //查询
        List<User> list = sqlMap.queryForList("getUser",id);
        System.out.println("执行select完毕");
        for (User user : list) {  
            System.out.println(user.id + ": " + user.name);  
        }
        

    }

}

testIbatis

数据库表结构：

CREATE TABLE `user` (
  `id` int(10) DEFAULT NULL,
  `name` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8

创建表语句（MySQL）