MyBatis使用手册（一）

开始学习使用MyBatis，对于框架不熟悉，上手确定很快，留存一份记录。

1、准备jar包：
mybatis-3.1.1.jar
mysql.jar
2、创建web项目，项目路径如下：
src:domain包
test:domain包
webroot:放置jar包

在mysql中创建数据库：Mybatis
创建表sysuser:包含三个字段
uid:int primary key
uname:varchar
passwd:varhcar

3、创建配置文件，包含数据库连接：在classpath下创建Configuration.xml，内容如下：

<?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 type="domain.Sysuser" alias="sysuser"/>
</typeAliases>
<environments default="development">

<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="domain/Sysuser.xml"/>
</mappers>
</configuration>

4、在src/domain包中创建Sysuser实体类

package domain;

/**
* 系统用户类
* @author  Drama
* @version 1.0
*/
public class Sysuser {

private int uid;
private String uname;
private String passwd;

public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getPasswd() {
return passwd;
}
public void setPasswd(String passwd) {
this.passwd = passwd;
}

@Override
public String toString(){
return "SysUser[id = "+uid+", name = "+uname+"]";
}
}

5、创建map文件：Sysuser.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">

<!--
实体映射文件
-->
<mapper namespace="Sysuser">
<!--
查询用的语句，
其中parameterType表示传递参数类型，
resultType表示查询结果组成的对象
-->
<select id="selectSysuser" parameterType="int" resultType="Sysuser">
select * from sysuser where uid = #{uid}
</select>

<insert id="insertNewSysuser"  parameterType="Sysuser">
insert into sysuser(uname,passwd)values(#{uname},#{passwd})
</insert>
</mapper>

6、在Configration.xml中引用map文件

7、创建测试类:在test/domain中创建TestSysuser.java类

package domain;

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 TestSysuser {

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {

//读取数据库连接，取得SqlSessionFactory
String resource = "Configuration.xml";
Reader reader = Resources.getResourceAsReader(resource);
SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
//取得session
SqlSession session = ssf.openSession();
try{
/**
* step 1:insert a new user
*/
Sysuser user = new Sysuser();
user.setUname("aaa");
user.setPasswd("bbb");
session.insert("insertNewSysuser", user);
System.out.println("------insert a new Sysuser."+user.getUname()+"---"+user.getPasswd());

/**
* step 2:get the sysuser
*/
Sysuser user2 = (Sysuser)session.selectOne("selectSysuser", 1);
System.out.println(user2.toString());
}catch(Exception e){
e.printStackTrace();
}finally{
session.close();
}
}

}

-----

完成。

没有什么技术含量，不过，从点滴做起，即使很简单，这本来不过是个helloworld程序，
准备将spring与mybatis结合到一起。