实体类
package cn.liwen.entity;
public class User {
private long id; //主键
private String username;//用户名
private String password;//密码
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username=‘" + username + ‘\‘‘ +
", password=‘" + password + ‘\‘‘ +
‘}‘;
}
}
接口实现类
package cn.liwen.impl;
import cn.liwen.entity.User;
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.testng.annotations.Test;
import org.testng.annotations.BeforeClass;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class UserDaoImpl {
private SqlSession session = null;
@BeforeClass
public void init() throws IOException {
// 1、启动mybatis框架
// SqlSession--->SqlSessionFatory----->SqlSessionFatoryBuilder
SqlSessionFactoryBuilder ssb = new SqlSessionFactoryBuilder();
// 将mybatis.xml文件转化成流
InputStream ins = Resources.getResourceAsStream("mybatis.xml");
SqlSessionFactory ssf = ssb.build(ins);
session = ssf.openSession();
}
/**
* 查询所以名字
* */
@Test
public void getAllUser() {
/** 2、调用局部配置文件中的sql语句*/
List<User> userList = session.selectList("cn.liwen.impl.UserDaoImpl.getAllUser");
for (User user : userList) {
System.out.println(user);
}
}
/**使用lists方式*/
@Test
public void getAllUserlist() throws IOException {
List<User> userList = session.selectList("cn.liwen.impl.UserDaoImpl.getAllUserlist");
for (User user : userList) {
System.out.println(user);
}
}
/**使用map方式*/
@Test
public void getAllUser2() {
// 2、调用局部配置文件中的sql语句
List<Map<String, Object>> userList = session.selectList("cn.liwen.impl.UserDaoImpl.getAllUser2");
for (Map<String, Object> map : userList) {
System.out.println(map);
}
}
/**测试单条记录方式*/
@Test
public void getUserById() {
//带参数方式
long id = 1L;
Map<String, Object> userList = session.selectOne("cn.liwen.impl.UserDaoImpl.getUserById",id);
System.out.println(userList);
}
/**多个参数*/
@Test
public void getUserByCondition() {
Map<String,Object> paraMap = new HashMap<String, Object>();
paraMap.put("username","李玟");
paraMap.put("pwd","321321");
Map<String, Object> userList = session.selectOne("cn.liwen.impl.UserDaoImpl.getUserById",paraMap);
System.out.println(userList);
}
/**通过实体类方式取值*/
@Test
public void getUserByCondition2() {
// 同时传递多个参数
User user = new User();
user.setUsername("李玟");
user.setPassword("321321");
Map<String, Object> userMap = session.selectOne("cn.liwen.impl.UserDaoImpl.getUserByCondition2", user);
System.out.println(userMap);
}
/**
执行模糊查询
*/
@Test
public void getUserByMh()
{
// 传递参数
Map<String, Object> paramMap = new HashMap<String, Object>();
paramMap.put("password", "3");
List<Map<String, Object>> userMap = session.selectList("cn.liwen.impl.UserDaoImpl.getUserByMh", paramMap);
for (Map<String, Object> map : userMap) {
System.out.println(map);
}
}
/**添加数据
delete、insert、update标签没有resultType属性
*/
@Test
public void addUser()
{
Map<String, Object> paramMap = new HashMap<String, Object>();
paramMap.put("username","北京");
paramMap.put("password","123455");
int flag = session.insert("cn.liwen.impl.UserDaoImpl.addUser", paramMap);
//增删改必须提交事务
session.commit();
System.out.println(flag);
}
}
接口实现类.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：命名空间，其值为某一个dao层类的具体路径
-->
<mapper namespace="cn.liwen.impl.UserDaoImpl">
<!-- sql语句保存在Mybatis的局部配置文件中 -->
<!--
select标签存放查询语句(List<User>)
id:在整个配置文件中id值必须唯一，其值与dao层类中的方法名保持一致
resultType：指定当前sql查询语句返回的数据类型。类型不是为sql语句的最终类型，而是某一条数据的类型
-->
<!-- findallusr : 是别名 -->
<select id="getAllUser" resultType="findallusr">
SELECT * FROM users
</select>
<!--使用list方式调用 -->
<select id="getAllUserlist" resultType="findallusr">
SELECT * FROM users
</select>
<!-- 使用map 方法查询-->
<select id="getAllUser2" resultType="Map">
SELECT * FROM users
</select>
<!--
parameterType：指定接收参数类型
-->
<select id="getUserById" resultType="Map" parameterType="long">
SELECT * FROM users where id=#{id}
</select>
<!--
当传递的参数有多个条件时
-->
<select id="getUserByCondition" resultType="map" parameterType="Map">
SELECT * FROM users WHERE username=#{username} AND PASSWORD=#{pwd}
</select>
<!--
当传递的参数有多个条件时
通过实体类方式
-->
<select id="getUserByCondition2" resultType="map" parameterType="cn.liwen.entity.User">
SELECT * FROM users WHERE username=#{username} AND PASSWORD=#{password}
</select>
<!--
执行模糊查询
-->
<select id="getUserByMh" resultType="map" parameterType="map">
SELECT * FROM users WHERE PASSWORD LIKE CONCAT(‘%‘,#{password},‘%‘)
</select>
<!-- 添加数据
delete、insert、update标签没有resultType属性
-->
<insert id="addUser" parameterType="Map">
INSERT INTO users SET username=#{username},PASSWORD=#{password}
</insert>
</mapper>mybatis.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>
<!-- 别名
-->
<typeAliases>
<typeAlias type="cn.liwen.entity.User" alias="findallusr"/>
</typeAliases>
<!-- 配置数据库连接环境：driver、url、username、password
default===默认配置
-->
<environments default="mysql">
<!-- 开始配置mysql -->
<environment id="mysql">
<!--配置事务 -->
<transactionManager type="JDBC"></transactionManager>
<!-- 配置数据源 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://192.168.47.196:3306/test?characterEncoding=utf-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!-- 关联局部配置文件 -->
<mappers>
<mapper resource="cn/liwen/impl/UserDaoImpl.xml"/>
</mappers>
</configuration>原文地址：http://blog.51cto.com/357712148/2109214
时间： 2024-08-26 20:22:17