2016-11-18_235500.png
SqlMapConfig.xml（全局配置文件）：
<?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>
<!-- 和spring整合后 environments配置將廢除-->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事務(wù)管理-->
<transactionManager type="JDBC" />
<!-- 數(shù)據(jù)庫連接池-->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:8010/test?characterEncoding=utf-8" />
<property name="username" value="root" />
<property name="password" value="wazl2012" />
</dataSource>
</environment>
</environments>
<!-- 加載映射文件 -->
<mappers>
<mapper resource="sqlmap/User.xml"/>
</mappers>
</configuration>
User.xml（映射配置文件）：
<?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="test">
<!--
需求：根據(jù)id獲取用戶信息
id:表示表示映射文件中的sql，將sql語句封裝到mappedStatement對(duì)象中，將id稱為Statement的 id
parameterType：指定出入?yún)?shù)類型
resultType：指定輸出參數(shù)類型
#{}表示一個(gè)占位符
#{id}接收輸入?yún)?shù)，參數(shù)名為id，如果輸入的是簡單類型，#{}中的參數(shù)名可以任意
-->
<select id="findUserById" parameterType="int" resultType="cn.ztc.mybatis.po.User">
select * from user where id = #{id}
</select>
<!--
需求：自定義條件查詢用戶列表 ，可能返回多條數(shù)據(jù)
resultType：指定的就是單條記錄所使用的java對(duì)象類型
${}表示拼接sql串，將接收到的參數(shù)不加任何修飾拼接在sql串中
使用${}可能會(huì)引起sqk注入
${value}接收輸入?yún)?shù)，如果輸入的是簡單類型，#{}中的參數(shù)名只能是value
-->
<select id="findUserByName" parameterType="java.lang.String" resultType="cn.ztc.mybatis.po.User">
select * from user where username like '%${value}%'
</select>
<!--
添加用戶
parameterType:輸入?yún)?shù)類型是pojo
#{}中指定pojo的屬性名
-->
<insert id="insertUser" parameterType="cn.ztc.mybatis.po.User">
<!--
將插入數(shù)據(jù)庫的主鍵返回到對(duì)象中
select LAST_INSERT_ID():得到insert記錄的主鍵值，只適用于自增主鍵
keyProperty：將查詢到的主鍵值設(shè)置到parameterType指定對(duì)象的某個(gè)屬性
order：相對(duì)于insert語句來說,select LAST_INSERT_ID()的執(zhí)行順序
-->
<selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
select LAST_INSERT_ID()
</selectKey>
insert into user (username,birthday,sex,address) values (#{username},#{birthday},#{sex},#{address})
<!--
使用mysql的uuid生成主鍵
執(zhí)行過程：
首先用過uuid()得到主鍵，將主鍵設(shè)置到user對(duì)象的id屬性中
其次在執(zhí)行insert，從user對(duì)象中取出id屬性值
-->
<!-- <selectKey keyProperty="id" order="BEFORE" resultType="java.lang.String">
select uuid()
</selectKey>
insert into user (id,username,birthday,sex,address) values (#{id},#{username},#{birthday},#{sex},#{address}) -->
</insert>
<!-- 刪除用戶 -->
<delete id="deleteUser" parameterType="java.lang.Integer">
delete from user where id=#{id}
</delete>
<!--
更新用戶
#{id}:對(duì)應(yīng)pojo的屬性值
-->
<update id="updateUser" parameterType="cn.ztc.mybatis.po.User">
update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id = #{id}
</update>
</mapper>
User.java
package cn.ztc.mybatis.po;
import java.util.Date;
public class User {
private int id;
private String username;
private String sex;
private Date birthday;
private String address;
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;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + "]";
}
}
MybatisFirst.java
package cn.ztc.mybatis.first;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
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 org.junit.Test;
import cn.ztc.mybatis.po.User;
public class MybatisFirst {
@Test
public void findUserByIdTest() throws IOException{
String resource = "SqlMapConfig.xml";
//得到配置文件流
InputStream inputStream = Resources.getResourceAsStream(resource);
//創(chuàng)建會(huì)化工廠
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//通過sqlSession操作數(shù)據(jù)庫
//第一個(gè)參數(shù)：映射文件中的[namespace].[statement id]
//第二個(gè)參數(shù)：映射文件中匹配的resultType類型的對(duì)象
SqlSession sqlSession = sqlSessionFactory.openSession();
//selectOne:查一條記錄
User user = sqlSession.selectOne("test.findUserById", 1);
System.out.println(user);
sqlSession.close();
}
@Test
public void findUserByNameTest() throws IOException {
String resource = "SqlMapConfig.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
List<User> list = sqlSession.selectList("test.findUserByName", "小明");
System.out.println(list);
sqlSession.close();
}
@Test
public void insertUserTest() throws IOException {
String resource = "SqlMapConfig.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
User user = new User();
user.setUsername("王小軍");
user.setBirthday(new Date());
user.setSex("1");
user.setAddress("上海");
sqlSession.insert("test.insertUser", user);
sqlSession.commit();
System.out.println(user.getId());
sqlSession.close();
}
@Test
public void deleteUserTest() throws IOException {
String resource = "SqlMapConfig.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
sqlSession.delete("test.deleteUser", 27);
sqlSession.commit();
sqlSession.close();
}
@Test
public void updateUserTest() throws IOException {
String resource = "SqlMapConfig.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession sqlSession = sqlSessionFactory.openSession();
User user = new User();
user.setId(24);
user.setUsername("張四豐");
user.setBirthday(new Date());
user.setSex("1");
user.setAddress("上海");
sqlSession.update("test.updateUser", user);
sqlSession.commit();
sqlSession.close();
}
}
