ibatis demo简单实现

开发平台：idea

开发步骤：

一、引入maven项目

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jd.xia</groupId>
    <artifactId>test-ibatis</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>test-mybatis</module>
        <module>test-ibatis1</module>
    </modules>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.31</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.13.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.ibatis/ibatis-sqlmap -->
        <dependency>
            <groupId>org.apache.ibatis</groupId>
            <artifactId>ibatis-sqlmap</artifactId>
            <version>2.3.4.726</version>
        </dependency>


    </dependencies>

</project>

二、建立ibatis模块

ibatis是一种相对低级的持久化框架，需要开发人员自己来写sql语句，这可以增加了程序的灵活性，在一定程度上可以作为ORM的一种补充。下面是代码：

<?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>
    <!-- 使用JDBC的事务管理 -->
    <transactionManager type="JDBC">
    <!-- 数据源 -->
    <dataSource type="SIMPLE">
    <property name="JDBC.Driver" value="com.mysql.jdbc.Driver"/>
    <property name="JDBC.ConnectionURL" value="jdbc:mysql://localhost:3306/test"/>
    <property name="JDBC.Username" value="root"/>
    <property name="JDBC.Password" value="123456"/>
</dataSource>
        </transactionManager>
        <!-- 这里可以写多个实体的映射文件 -->
<sqlMap resource="userMapper.xml"/>
</sqlMapConfig>

<?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.mongo.ibatis.User"/>

    <select id="selectById" resultClass="com.mongo.ibatis.User">
        SELECT * FROM user WHERE id in($ids$)
    </select>
    <select id="" parameterClass="" resultClass="User">
        SELECT * FROM  user WHERE id IN<iterate property="ids" open="(" conjunction="," close=")" >id=#ids[]#</iterate>
    </select>

</sqlMap>

package com.mongo.ibatis;

import java.util.List;

public interface UserDao {
    List<User> getUserById(Integer id);
}

package com.mongo.ibatis;

public class User {
    int id;
    String username;

    public User(int id, String username) {
        this.id = id;
        this.username = username;
    }

    public User() {
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                '}';
    }
}

package com.mongo.ibatis;

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

import java.io.IOException;
import java.io.Reader;
import java.sql.SQLException;
import java.util.List;

public class UserDaoImpl implements UserDao {
    private static SqlMapClient sqlMapClient = null;
    // 读取配置文件
    static {
        try {
            Reader reader = Resources
                    .getResourceAsReader("ibatis-config.xml");
            sqlMapClient = SqlMapClientBuilder.buildSqlMapClient(reader);
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public User getUser(int id) {
        return null;
    }

    public List<User> getUserById(Integer id) {
        List<User> users = null;
        try {
            users = sqlMapClient.queryForList("selectById", id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return users;
    }
}

package com.mongo.ibatis;


import java.io.IOException;
import java.util.List;


public class Test {

    public static void main(String[] args) throws IOException {
        UserDao userDao = new UserDaoImpl();
        List<User> users = userDao.getUserById(1);
        System.out.println(users);
    }

}

github:https://github.com/xhyflowcloud/ORM.git