Mybaits技术（一） Mybatis入门示例

1. 搭建开发环境（1）新建一个Web工程，名称为MybatisFramework。 （2）将以下的JAR放到Web工程的lib下面：

java代码：

mybatis-3.0.6.jar
og4j-1.2.16.jar
classes12.jar

 （3）在src下面新建log4j.properties文件，该文件的内容如下：

java代码：

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] -%m%n
log4j.logger.com.ibatis=debug
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug
log4j.logger.java.sql.Connection=debug
log4j.logger.java.sql.Statement=debug
log4j.logger.java.sql.PreparedStatement=debug,stdout

 （4）在src下面新建mybatis.cfg.xml文件，该文件的内容如下：
Java代码   

java代码：

<?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>



    <environments default="development">

        <environment id="development">

            <transactionManager type="JDBC" />

            <dataSource type="POOLED">

              <property name="driver" value="oracle.jdbc.OracleDriver" />

              <property name="url" value="jdbc:oracle:thin:@localhost:1521:SID" />

              <property name="username" value="xxxx" />

              <property name="password" value="xxxx" />

            </dataSource>

        </environment>

    </environments>



    </configuration>

 
  2. 入门示例  （1）在Oracle数据库执行以下SQL，创建一个USER_INFO的表： 
Java代码   

java代码：

-- Create table

create table USER_INFO

(

  ID          NUMBER(12) not null,

  NAME        VARCHAR2(50)

);



--Insert data

insert into USER_INFO(ID,NAME) values(1,'张三');

 
  （2）新建一个Java类UserInfo.java，该类的内容如下： 

java代码：

Java代码
package com.user;



public class UserInfo {

    private int id;

    private String name;



    public UserInfo() {

    }



    public UserInfo(String name) {

        this(0, name);

    }



    public UserInfo(int id, String name) {

        this.id = id;

        this.name = 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;

    }



    @Override

    public String toString() {

        return "ID: " + id + ", Name: " + name;

    }

}

 （3）在com.user.sqlmap下面新建UserInfo.xml文件，该文件的内容如下： 
Java代码   

java代码：

<?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">



<mapper namespace="User">

    <select id="selectUser" parameterType="int" resultType="UserInfo">

    <![CDATA[

        select * from user_info where id = #{id}

    ]]>

    < lect>

</mapper>

 （4）将UserInfo.xml引用到mybatis.cfg.xml文件中，mybatis.cfg.xml文件更新后的内容如下：

java代码：

Java代码
<?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>

    <typeAliases>

        <typeAlias alias="UserInfo" type="com.user.UserInfo" />

    < peAliases>



    <environments default="development">

        <environment id="development">

            <transactionManager type="JDBC" />

            <dataSource type="POOLED">

              <property name="driver" value="oracle.jdbc.OracleDriver" />

              <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORACLEDB" />

              <property name="username" value="oracle" />

              <property name="password" value="oracle" />

            </dataSource>

        </environment>

    </environments>



    <mappers>

        <mapper resource="com/user/sqlmap/UserInfo.xml" />

    </mappers>

</configuration>

 （5）新建一个测试Java类UserInfoTest.java，该类的具体内容如下：
Java代码   

java代码：

package com.user;



import java.io.IOException;

import java.io.Reader;



import org.apache.ibatis.io.Resources;

import org.apache.ibatis.session.SqlSession;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;







public class UserInfoTest {



    /**

     * @param args

     * @throws IOException

     */

    public static void main(String[] args) throws IOException {

        String resource = "mybatis.cfg.xml";

        Reader reader = Resources.getResourceAsReader(resource);

        SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);



        SqlSession session = ssf.openSession();



        try {

            UserInfo user = (UserInfo) session.selectOne("User.selectUser", "1");

            System.out.println(user);

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            session.close();

        }

    }



}

 （6）右键UserInfoTest 类，选择Run As Application，运行MyBaits操作数据库。 

java代码：

Java代码
log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

2012-02-11 21:44:01,750 DEBUG [java.sql.PreparedStatement] -==>  Executing: select * from user_info where id = ?

2012-02-11 21:44:01,781 DEBUG [java.sql.PreparedStatement] -==> Parameters: 1(String)

ID: 1, Name: 张三