Mybatis的配置文件：
<?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整合後，environments配置將廢除 -->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事務管理，事務控制由mybatis -->
<transactionManager type="JDBC"/>
<!-- 數據庫連接池，由mybatis控制 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/數據庫名稱"/>
<property name="username" value="用戶名"/>
<property name="password" value="密碼"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mapper/User.xml"/>
</mappers>
</configuration>
package com.itachi.mybatis.bean;
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;
}
public User() {
super();
// TODO Auto-generated constructor stub
}
public User(int id, String username, String sex, Date birthday,
String address) {
super();
this.id = id;
this.username = username;
this.sex = sex;
this.birthday = birthday;
this.address = address;
}
@Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", sex=" + sex
+ ", birthday=" + birthday + ", address=" + address + "]";
}
}
<?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">
<!-- 在映射文件中配置很多sql語句 -->
<!-- 需求：通過id查詢用戶表的記錄 -->
<!-- 通過select執行數據庫的查詢
id：標識映射文件中的sql，將sql語句封裝到mappedStatement對象中，所以將id成爲statement的id
parameterType：指定輸入參數的類型，這裏指定爲int
#{}：表示一個佔位符
#{id}：其中的id表示將接收的輸入參數，參數名稱就是id，如果輸入參數是簡單類型，#{}中的參數名可以隨意
resultType：指定sql輸出結果的java對象類型，select指定resultType表示將單條記錄映射成java對象
-->
<select id="findUserById" parameterType="int" resultType="com.itachi.mybatis.bean.User">
SELECT * FROM USER WHERE id=#{id}
</select>
<!-- 根據用戶名稱模糊查詢用戶信息，可能返回多條記錄
${}：表示拼接sql串，將接收到的參數內容不加任何修飾拼接在sql中
-->
<select id="findUserByName" parameterType="java.lang.String" resultType="com.itachi.mybatis.bean.User">
SELECT * FROM USER WHERE username LIKE '%${value}%'
</select>
<!-- 添加用戶 -->
<insert id="insertUser">
INSERT INTO USER(username, birthday, sex, address) VALUES(#{username}, #{birthday}, #{sex}, #{address})
</insert>
<!-- 修改用戶 -->
<update id="updateUser" parameterType="com.itachi.mybatis.bean.User">
UPDATE USER SET username=#{username}, birthday=#{birthday}, sex=#{sex}, address=#{address} WHERE id=#{id}
</update>
<!-- 刪除用戶 -->
<delete id="deleteUser">
DELETE FROM USER WHERE id=#{id}
</delete>
</mapper>
package com.itachi.mybatis.test;
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 com.itachi.mybatis.bean.User;
public class MybatisFirst {
@Test
public void findUserByIdTest() throws IOException{
//配置文件
String resource = "Mybatis-config.xml";
//得到配置文件流
InputStream is = Resources.getResourceAsStream(resource);
//創建會話工廠，傳入配置文件信息
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
//通過工廠得到sqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
//通過sqlSession操作數據庫
//第一個參數：映射文件中statement的id，等於namespace+"."+statement的id
//第二個參數：指定和映射文件中所匹配的parameterType類型的參數
User user = sqlSession.selectOne("test.findUserById", 1);
System.out.println(user);
sqlSession.close();
}
@Test
public void findUserByNameTest() throws IOException {
String resource = "Mybatis-config.xml";
InputStream is = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession sqlSession = sqlSessionFactory.openSession();
List<User> list = sqlSession.selectList("test.findUserByName", "小明");
for (User user : list) {
System.out.println(user);
}
sqlSession.close();
}
@Test
public void insertUserTest() throws IOException {
String resource = "Mybatis-config.xml";
InputStream is = Resources.getResourceAsStream(resource);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = factory.openSession();
int insert = session.insert("test.insertUser", new User(-1, "財子紫", "2", new Date(), "美國"));
System.out.println(insert);
session.commit();
session.close();
}
@Test
public void updateUserTest() throws IOException {
String resource = "Mybatis-config.xml";
InputStream is = Resources.getResourceAsStream(resource);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = factory.openSession();
int update = session.update("test.updateUser", new User(27, "宏宇族", "2", new Date(), "新加坡"));
System.out.println(update);
session.commit();
session.close();
}
@Test
public void deleteUserTest() throws IOException {
String resource = "Mybatis-config.xml";
InputStream is = Resources.getResourceAsStream(resource);
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
SqlSession session = factory.openSession();
int delete = session.update("test.deleteUser", 27);
System.out.println(delete);
session.commit();
session.close();
}
}