02 mybatis动态sql（xml方式实现单表的增删改查）

QueryVo

package cn.itcast.domain;

import java.io.Serializable;

import java.util.List;

public class QueryVo implements Serializable {

private List<Integer> ids;

public List<Integer> getIds() {

return ids;

}

public void setIds(List<Integer> ids) {

this.ids = ids;

}

@Override

public String toString() {

return "QueryVo{" +

"ids=" + ids +

'}';

}

User.java

package cn.itcast.domain;

import java.io.Serializable;

import java.util.Date;

/**

public class User implements Serializable {

/* private Integer id;

private String username;

private String address;

private String sex;

private Date birthday;

public User() {

}

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

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;

}

@Override

public String toString() {

return "User{" +

"id=" + id +

", username='" + username + '\'' +

", address='" + address + '\'' +

", sex='" + sex + '\'' +

", birthday=" + birthday +

'}';

}*/

//*************************************************************************************************************************************************************

private Integer userId;

private String userName;

private String userAddress;

private String userSex;

private Date userBirthday;

public Integer getUserId() {

return userId;

}

public void setUserId(Integer userId) {

this.userId = userId;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getUserAddress() {

return userAddress;

}

public void setUserAddress(String userAddress) {

this.userAddress = userAddress;

}

public String getUserSex() {

return userSex;

}

public void setUserSex(String userSex) {

this.userSex = userSex;

}

public Date getUserBirthday() {

return userBirthday;

}

public void setUserBirthday(Date userBirthday) {

this.userBirthday = userBirthday;

}

@Override

public String toString() {

return "User{" +

"userId=" + userId +

", userName='" + userName + '\'' +

", userAddress='" + userAddress + '\'' +

", userSex='" + userSex + '\'' +

", userBirthday=" + userBirthday +

'}';

}

public static void main(String[] args) {

System.out.println("000");

}

IUserDao.java

package cn.itcast.dao;

import cn.itcast.domain.QueryVo;

import cn.itcast.domain.User;

import java.util.List;

/**

* 用户接口

public interface IUserDao {

//根据用户信息，查询用户列表

public List<User> findUser(User user);

//传入多个 id 查询用户信息

public List<User> findUsersByIds(List<Integer> list);

//传入多个 id 查询用户信息(多个id放入list中,在将list作为Queryvo的属性)

public List<User> findUsersByIds1(QueryVo queryVo);

//修改用户

public void updateUser(User user);

//新增用户

public void addUser(User user);

}

IUserDao.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">

<!--配置user类的属性和user表中的列的对应关系（主要是解决表查询出来的字段名和pojo的属性名不一致）

(type="user"是在SqlMapConfig中配置别名了，所以可以直接写user)-->

</resultMap>

select * from user

</sql>

<!--根据用户信息，查询用户列表

parameterType：参数类型

resultMap：对应<resultMap>标签的id

-->

<where>

username = #{userName}

</if>

and sex = #{userSex}

</if>

</where>

</select>

<!--foreach

collection:需要遍历的集合

item：每次遍历的对象

open：循环开始输出的内容，只会输出一次

close：循环结束输出的内容，只会输出一次

separator：每次循环后，添加的内容，循环几次添加几次

-->

<where>

#{id}

</foreach>

</if>

</where>

</select>

<!--<select id="findUsersByIds1" parameterType="cn.itcast.domain.QueryVo" resultMap="userMap">

<where>

#{id}

</foreach>

</if>

</where>

</select>-->

<where>

id = #{id}

</foreach>

</if>

</where>

</select>

update user

<set>

sex = #{userSex},

</if>

username = #{userName}

</if>

</set>

<where>

id = #{userId}

</if>

</where>

</update>

<!--selectKey作用：

获取新增对象的id

order:在新增之后执行用（BEFORE），新增之前用（AFTER）

mysql：自增，last_insert_id() AFTER ====>在新增成功之后，返回新增那条的id

UUID uuid(); 一般在新增之前进行uuid的插入

resultType：返回主键ID的类型

keyProperty：模型类中主键的属性名

order：新增之前，还是新增之后

-->

select last_insert_id()

</selectKey>

insert into user (<include refid="insert_key"></include>) VALUES(<include refid="insert_value"></include>)

</insert>

<!--

prefix:在trim标签内sql语句加上前缀。

suffix:在trim标签内sql语句加上后缀。

suffixOverrides:指定去除多余的后缀内容，如：suffixOverrides=","，去除trim标签内sql语句多余的后缀","。

prefixOverrides:指定去除多余的前缀内容

userName，userBirthday，userAddress为pojo属性名

username,birthday,address,为数据库字段名

-->

username,

</if>

birthday,

</if>

sex,

</if>

address,

</if>

</trim>

</sql>

#{userName},

</if>

#{userBirthday},

</if>

#{userSex},

</if>

#{userAddress},

</if>

</trim>

</sql>

</mapper>

MybatisTest.java

package test;

import cn.itcast.dao.IUserDao;

import cn.itcast.domain.QueryVo;

import cn.itcast.domain.User;

import org.apache.ibatis.session.SqlSession;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import java.io.IOException;

import java.io.InputStream;

import java.text.ParseException;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

public class MybatisTest {

private InputStream in;

private IUserDao userDao;

private SqlSession sqlSession;

//在测试方法之前执行

@Before

public void init() {

/**

* ORM+SqlMapConfig+sqlSession

//加载配置文件

in = MybatisTest.class.getClassLoader().getResourceAsStream("SqlMapConfig.xml");

//创建构建者对象

SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();

//创建sqlSession工厂

SqlSessionFactory sqlSessionFactory = builder.build(in);

//创建sqlSession

sqlSession = sqlSessionFactory.openSession();

//获取代理对象

userDao = sqlSession.getMapper(IUserDao.class);

}

//测试方法之后执行

@After

public void destory() throws IOException {

//提交事务

sqlSession.commit();

//释放资源

sqlSession.close();

in.close();

}

//根据用户信息，查询用户列表

@Test

public void testFindUser() {

User user = new User();

user.setUserName("李四");

user.setUserSex("女");

List<User> list = userDao.findUser(user);

for (User user1 : list) {

System.out.println(user1);

}

//传入多个 id 查询用户信息(多个id放入list中)

@Test

public void testFindUsersByIds() {

List<Integer> ids = new ArrayList<Integer>();

ids.add(42);

ids.add(45);

List<User> list1 = userDao.findUsersByIds(ids);

for (User user1 : list1) {

System.out.println(user1);

}

//传入多个 id 查询用户信息(多个id放入list中,在将list作为Queryvo的属性)

@Test

public void testFindUsersByIds1() {

List<Integer> list = new ArrayList<Integer>();

list.add(42);

list.add(43);

list.add(45);

QueryVo queryVo = new QueryVo();

queryVo.setIds(list);

List<User> userList = userDao.findUsersByIds1(queryVo);

for (User user : userList) {

System.out.println(user);

}

//修改id为42的用户的性别为男，地址为中国

@Test

public void testUpdateUser(){

User user = new User();

user.setUserSex("男");

user.setUserName("韩晓峰");

user.setUserId(43);

userDao.updateUser(user);

}

//新增用户

@Test

public void testAddUser() throws ParseException {

User user = new User();

user.setUserName("张莹莹");

user.setUserAddress("陕西咸阳");

user.setUserSex("女");

Date date = new Date();

user.setUserBirthday(date);

userDao.addUser(user);

}

db.properties

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/mybatis

jdbc.username=root

jdbc.password=123456

log4j.properties

此文件可以输出到文件

# Set root category priority to INFO and its only appender to CONSOLE.

#log4j.rootCategory=INFO, CONSOLE debug info warn error fatal

#输出到log文件中(d:\axis.log文件中)

#log4j.rootCategory=debug, CONSOLE, LOGFILE

#只输出到控制台

log4j.rootCategory=debug, CONSOLE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.

log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# 日志输出到控制台

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender

log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout

log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

# 日志输出到指定文件,根路径/

log4j.appender.LOGFILE=org.apache.log4j.FileAppender

log4j.appender.LOGFILE.File=/axis.log

log4j.appender.LOGFILE.Append=true

log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout

log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

SqlMapConfig.xml

<?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">

<!--配置properties 1.可以在标签内部配置连接数据库的信息。

2.也可以通过属性引用外部配置文件信息,url属性或者resource属性

resource属性：常用的用于指定配置文件的位置，是按照类路径的写法来写，并且必须存在于类路径下-->

<!-- <property name="driver" value="com.mysql.jdbc.Driver"></property>

<property name="username" value="root"></property> <property name="password"

value="1234"></property> -->

</properties>

</typeAliases>

</dataSource>

</environment>

</environments>

</mappers>

</configuration>

02 mybatis动态sql（xml方式实现单表的增删改查）

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