Mybatis的搭建与使用

jopen 10年前

Hibernate是非常完美的一个持久性框架，但是由于其考虑到各种功能和通用性，导致这个框架太大了，另外就是封装的太好了导致自主性比较小。所以Mybatis受到很多公司的欢迎。Mybatis以前叫做ibatis，用法稍微有点区别，在这里我用的是Mybatis 3

1.去官网下载Mybatis的Jar包 http://mybatis.github.io/

2.配置SqlMapConfig.xml文件

    <?xml version="1.0" encoding="UTF-8" ?>        <!DOCTYPE configuration        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"        "http://mybatis.org/dtd/mybatis-3-config.dtd">        <configuration>            <!-- 给bean取别名用在mapping文件中 -->            <typeAliases>                <typeAlias type="com.lubby.bean.Worker" alias="Worker" />            </typeAliases>            <environments default="development">                <environment id="development">                    <!-- 使用JDBC的事务管理 -->                    <transactionManager type="JDBC" />                    <!-- 数据源 -->                    <dataSource type="POOLED">                        <property name="driver" value="org.postgresql.Driver" />                        <property name="url" value="jdbc:postgresql://127.0.0.1:5432/lubby" />                        <property name="username" value="admin" />                        <property name="password" value="admin" />                    </dataSource>                </environment>            </environments>            <!-- 这里可以写多个实体的映射文件 -->            <mappers>                <mapper resource="com/lubby/bean/WorkerSqlMap.xml" />            </mappers>        </configuration>
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3.worker bean
    package com.lubby.bean;        public class Worker {            private String id;            private String name;            int age;            public Worker() {                super();            }            public Worker(String id, String name, int age) {                super();                this.id = id;                this.name = name;                this.age = age;            }            public String getId() {                return id;            }            public void setId(String id) {                this.id = id;            }            public String getName() {                return name;            }            public void setName(String name) {                this.name = name;            }            public int getAge() {                return age;            }            public void setAge(int age) {                this.age = age;            }            @Override            public String toString() {                return "Worker [id=" + id + ", name=" + name + ", age=" + age + "]";            }        }
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3.bean的mapping配置文件  WorkerSqlMap.xml
    <?xml version="1.0" encoding="UTF-8" ?>        <!DOCTYPE mapper        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">                <!-- namespace用于java代码调用时识别指定xml的mapper文件 -->        <mapper namespace="com.lubby.bean">            <sql id="field">                id,name,age            </sql>            <select id="getAllWorker" resultType="Worker">                select                <include refid="field" />                from worker            </select>            <select id="getWorkerById" resultType="Worker">                select                <include refid="field" />                from worker where                id= #{id}            </select>            <select id="getWorkerByName" resultType="Worker">                select                <include refid="field" />                from worker where name like '%'||#{name}||'%'            </select>                    <insert id="addWorker">                insert into worker (                <include refid="field" />                ) values(#{id},#{name},#{age})            </insert>                    <update id="updateWorker">                update worker set name=#{name} ,age=#{age} where                id=#{id}            </update>                    <delete id="deleteWorkerById">            delete from worker where id=#{id};            </delete>        </mapper>
</div> </div> 4.在主函数中使用mybatis
package com.lubby.test;        import java.io.IOException;    import java.io.Reader;    import java.util.List;        import org.apache.ibatis.io.Resources;    import org.apache.ibatis.session.SqlSession;    import org.apache.ibatis.session.SqlSessionFactory;    import org.apache.ibatis.session.SqlSessionFactoryBuilder;        import com.lubby.bean.Worker;        public class Test {        public static void main(String[] args) {            SqlSessionFactory factory = null;            try {                Reader reader = Resources.getResourceAsReader("com/lubby/config/SqlMapConfig.xml");                factory = new SqlSessionFactoryBuilder().build(reader);                } catch (IOException e) {                e.printStackTrace();            }                SqlSession session = factory.openSession();                Worker worker = new Worker("003", "Join", 100);            //session.insert("com.lubby.bean.addWorker", worker);            //session.delete("com.lubby.bean.deleteWorkerById", "005");            //session.commit();            List<Worker> list = session.selectList("com.lubby.bean.getAllWorker");            System.out.println(session.selectOne("com.lubby.bean.getWorkerById", "001"));            System.out.println(session.update("com.lubby.bean.updateWorker", worker));            System.out.println(session.delete("com.lubby.bean.deleteWorkerById", "004"));            session.commit();            System.out.println(session.selectList("com.lubby.bean.getWorkerByName", "J"));            System.out.println(list);        }        }
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