一、mybatis搭建配置环境
1.导入jar包（坐标）
4.0.0
com.itheima
kuangjia001
1.0-SNAPSHOT
org.mybatis
mybatis
3.5.0
mysql
mysql-connector-java
5.1.47
log4j
log4j
1.2.17
junit
junit
4.12
test
2.创建mybatis主配置文件
D:\黑马培训\ideal代码包\kuangjia001\src\main\resources\mybatis-config.xml
3.准备实体类和表结构
D:\黑马培训\ideal代码包\kuangjia001\src\main\java\com\itheima\domain\User.java
package com.itheima.domain;
import java.io.Serializable;
import java.util.Date;
public class User implements Serializable {
private Integer uid;//主键。类型要使用包装类型
private String name;//登录名
private String password;//密码
private String email;//邮箱
private String phoneNumber;//手机号
private Date birthday;//生日
@Override
public String toString() {
return "User{" +
"uid=" + uid +
", name='" + name + '\'' +
", password='" + password + '\'' +
", email='" + email + '\'' +
", phoneNumber='" + phoneNumber + '\'' +
", birthday=" + birthday +
'}';
}
public Integer getUid() {
return uid;
}
public void setUid(Integer uid) {
this.uid = uid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
4.创建Mapper接口（Dao接口）
D:\黑马培训\ideal代码包\kuangjia001\src\main\java\com\itheima\dao\UserMapper.java
public interface UserMapper {
/**
* 添加一条用户记录
* @param user
*/
void addUser(User user)
}5.创建Mapper接口方法和SQL映射文件
D:\黑马培训\ideal代码包\kuangjia001\src\main\resources\mybatis-config.xml（映射文件与src\main\res）
?xml version="1.0" encoding="UTF-8" ?>
//parameterType方法中输入值的类型
INSERT into users (name,password,email,phoneNumber,birthday) values (#{name},#{password},#{email},#{phoneNumber},#{birthday});//#{name}相当于调用users.getname方法
6。将映射文件添加到Mybatis
D:\黑马培训\ideal代码包\kuangjia001\src\main\resources\mybatis-config.xml
二、入门案例一
1.案例一中主要的类和接口
Resources:加载mybatis配置文件。
SqlSessionFactoryBuilder:利用Resources指定的资源，将配置信息加载到内存中，还会加载所有的配置文件映射配置信息，并用特定的对象实例进行保存，从而创建SqlSessionFactory对象。
SqlSessionFactory:包含所有配置内容的对象，一个项目只用一个。
SqlSession:每个线程独有，用时打开，不用关闭。单独使用mybaits进行开发时最常用的接口。
openSession:获取SqlSessionFactory，返回一个SqlSession对象创建事务。底层是做各种成员变量的初始化。
BasemapperTest基类用于junit单元测试。
classloader:类加载器，将类加载到jvm 中。
Resources 类为从类路径中加载资源，提供了易于使用的方法。
? 从类路径加载 SQL Map 配置文件（如 sqlMap-config.xml）。
? 从类路径加载 DAO Manager 配置文件（如 dao.xml）
? 从类路径加载各种.properties 文件。
2.案例源码
2.1
01.mybatis 的Junit测试基类
1.获取配置文件的输入流
2.通过输入流获得sqlSessionFactoryBuilder工厂
3.创建openSession,获取SqlSessionFactory，返回一个SqlSession对象创建事务。
public class BaseMapperTest {
private static SqlSessionFactory sqlSessionFactory;
@BeforeClass//仅在加载类字节码时执行一次
public static void init(){
try {
InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");//获取配置文件的输入流
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//SqlSessionFactoryBuilder:加载所有的配置文件映射配置信息，并用特定的对象实例进行保存，从而创建SqlSessionFactory对象。
} catch (IOException e) {
e.printStackTrace();
}
}
protected SqlSession openSession() {return sqlSessionFactory.openSession();}
}02.测试编码模板
@Test
public void testAddUser3() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
//获取UserMapper实例
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
System.out.println(userMapper.getClass().getCanonicalName());
//调用方法
User user = new User();
user.setName("user4");
user.setPassword("sorry");
user.setEmail("[email protected]");
user.setPhoneNumber("124");
user.setBirthday(new Date());
userMapper.addUser(user);
//提交事务
sqlSession.commit();
}catch (Exception e){
sqlSession.rollback();
throw new RuntimeException(e);
}finally{
//释放资源
sqlSession.close();
}
}2.2查询所有记录
resultMap映射结果集
com/itheima/dao/UserMapper.xml
//com.itheima.test.UserMapperTest
@Test
public void testFinaAllUsers() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
List users = userMapper.findAllUsers();
for(User user:users)
System.out.println(user);
}catch (Exception e){
throw new RuntimeException(e);
}finally{
sqlSession.close();
}
} 2.2查询一条记录
com/itheima/dao/UserMapper.xml
com.itheima.test.UserMapperTest
@Test
public void testFinaUserByUid() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
User user = userMapper.findUserByUid(1);
System.out.println(user);
}catch (Exception e){
throw new RuntimeException(e);
}finally{
sqlSession.close();
}
}2.3查询多条记录
com.itheima.dao.UserMapper
/**
- 根据用户名和密码查询
- @param name,password
- @return
*/
User findUserByNamePassword(@Param("name") String name,@Param("password") String password);
//设置param别名，与xml中的代码相联系。
com/itheima/dao/UserMapper.xml
com.itheima.test.UserMapperTest
@Test
public void testFinaUserByNamePassword() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
User user = userMapper.findUserByNamePassword("admin","sorry");
System.out.println(user);
}catch (Exception e){
throw new RuntimeException(e);
}finally{
sqlSession.close();
}
}2.4根据POJO查询
com.itheima.dao.UserMapper
/**
* 根据用户名和密码查询
* @param userVo
* @return
*/
User findUserByNamePassword1(User userVo);
com/itheima/dao/UserMapper.xml
com.itheima.test.UserMapperTest
@Test
public void testFinaUserByNamePassword1() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
User userVo = new User();
userVo.setName("admin");
userVo.setPassword("sorry");
User user = userMapper.findUserByNamePassword1(userVo);
System.out.println(user);
}catch (Exception e){
throw new RuntimeException(e);
}finally{
sqlSession.close();
}
}2.5模糊查询
com.itheima.dao.UserMapper
01 List findUsersByName(String name);
02 List findUsersByName1(@Param("name") String name);
03 List findUsersByName2(String name); com/itheima/dao/UserMapper.xml
01 select uid,name,password,email,phoneNumber,birthday from users where name like #{name}
02 select uid,name,password,email,phoneNumber,birthday from users where name like '%${name}%'
03 select uid,name,password,email,phoneNumber,birthday from users where name like concat('%',#{name},'%')com.itheima.test.UserMapperTest
01 List users = userMapper.findUsersByName("%user%");
02 List users = userMapper.findUsersByName1("user");
03 List users = userMapper.findUsersByName2("user"); 2.6获取自动生成的主键
com.itheima.dao.UserMapper
void addUser1(User user);
void addUser2(User user);com/itheima/dao/UserMapper.xml
INSERT into users (name,password,email,phoneNumber,birthday) values (#{name},#{password},#{email},#{phoneNumber},#{birthday});
select last_insert_id()
INSERT into users (name,password,email,phoneNumber,birthday) values (#{name},#{password},#{email},#{phoneNumber},#{birthday});
com.itheima.test.UserMapperTest
@Test
public void testAddUser6() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
//获取UserMapper实例
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
System.out.println(userMapper.getClass().getCanonicalName());
//调用方法
User user = new User();
user.setName("user10");
user.setPassword("sorry");
user.setEmail("[email protected]");
user.setPhoneNumber("130");
user.setBirthday(new Date());
userMapper.addUser2(user);
//提交事务
sqlSession.commit();
System.out.println(user);
}catch (Exception e){
sqlSession.rollback();
throw new RuntimeException(e);
}finally{
//释放资源
sqlSession.close();
}
}2.6修改和删除
com.itheima.dao.UserMapper
void updateUser(User user);
void deleteUserByUid(Integer uid);
com/itheima/dao/UserMapper.xml
update users set name=#{name},password=#{password},email=#{email},phoneNumber=#{phoneNumber},birthday=#{birthday} where uid=#{uid}
delete from users where uid=#{uid}
com.itheima.test.UserMapperTest
@Test
public void testDeleteUser() throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = openSession();
//获取UserMapper实例
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
System.out.println(userMapper.getClass().getCanonicalName());
userMapper.deleteUserByUid(9);
sqlSession.commit();
}catch (Exception e){
throw new RuntimeException(e);
}finally{
sqlSession.close();
}
}