package com.itheima.dao.impl; import com.itheima.dao.IUserDao; import com.itheima.domain.User; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import java.util.List; /** * @author 黑马程序员 * @Company http://www.ithiema.com */ public class UserDaoImpl implements IUserDao { private SqlSessionFactory factory; public UserDaoImpl(SqlSessionFactory factory){ this.factory = factory; } @Override public List <the User> the findAll () { // 1. The Object Factory acquired SqlSession SqlSession the session = factory.openSession (); // 2. SqlSession the calling method, implemented lookup table List <User> users = session. selectList is ( "com.itheima.dao.IUserDao.findAll"); // parameters that can be acquired configuration information Key // 3. release resources Session.close (); return Users; } @Override public void saveUser (the User User) { // 1. The Object Factory acquired SqlSession SqlSession the session = factory.openSession (); //2. Call the method to achieve conservation session.insert ( "com.itheima.dao.IUserDao.saveUser" , the User); // 3. commit the transaction Session.commit (); // 4. release resources session.close (); } @override public void the updateUser (the User User) { // 1. The Object Factory acquired SqlSession SqlSession the session = factory.openSession (); // 2. calls the update method implementation session.update ( "com.itheima.dao.IUserDao.updateUser " , the User); // 3. commit the transaction Session.commit (); // 4. release resources session.close (); } @Override public void deleteUser (Integer the userId) { // 1. The Object Factory acquired SqlSession SqlSession the session = factory.openSession (); // 2. calls the Update method implementation session.update ( "com.itheima.dao.IUserDao.deleteUser " , the userId); // 3. commit the transaction Session.commit (); // 4. release resources Session.close (); } @Override public the User the findById (Integer the userId) { // 1. The factory objects acquired SqlSession SqlSession = the session factory.openSession (); //2. Call the method SqlSession achieve a query the User the User = session.selectOne ( "com.itheima.dao.IUserDao.findById" , userId); // 3. release resources session.close (); return the User; } @ override public list <the User> the findByName (String username) { // 1. the Object Factory acquired SqlSession SqlSession the session = factory.openSession (); // 2. SqlSession the calling method, implemented lookup table list <User> users = session .selectList ( "com.itheima.dao.IUserDao.findByName" , username); // 3. release resources session.close (); return the Users; } @Override public int findTotal () { // 1. The Object Factory acquired SqlSession SqlSession the session = factory.openSession (); // 2. SqlSession the calling method to achieve a query Integer count = session.selectOne ( "com.itheima .dao.IUserDao.findTotal " ); // 3. release resources session.close (); return COUNT; } }
mapper
<?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="com.itheima.dao.IUserDao"> <!-- 查询所有 --> <select id="findAll" resultType="com.itheima.domain.User"> select * from user; </select> <!-- 保存用户 --> <insert id="saveUser" parameterType="com.itheima.domain.User"> <!-- 配置插入操作后，获取插入数据的id --> <selectKey keyProperty="id" keyColumn="id" resultType="int" order="AFTER"> select last_insert_id(); </selectKey> insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday}); </insert> <!-- 更新用户 --> <update id="updateUser" parameterType="com.itheima.domain.User"> update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id} </update> <!-- 删除用户--> <delete id="deleteUser" parameterType="java.lang.Integer"> delete from user where id = #{uid} </delete> <!-- 根据id查询用户 --> <select id="findById" parameterType="INT" resultType="com.itheima.domain.User"> select * from user where id =UID} {# </ SELECT> <-! fuzzy search based on the name -> <SELECT ID = "the findByName" the parameterType = "String" the resultType = "com.itheima.domain.User"> SELECT * from User like WHERE username {name} # </ SELECT> <! - the total number of records acquired user -> <SELECT ID = "findTotal" the resultType = "int"> SELECT COUNT (ID) from user; </ SELECT> </ Mapper >
sqlconfig
<?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> <!--配置环境--> <environments default="mysql"> <!-- 配置mysql的环境--> <environment id="mysql"> <!-- 配置事务 --> <transactionManager type="JDBC"></transactionManager> <!--配置连接池--> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"></property> <property name="url" value="jdbc:mysql://localhost:3306/eesy_mybatis"></property> <property name="username" value="root"></property> <property name="password" value="1234"></property> </dataSource> </environment> </environments> <!-- 配置映射文件的位置 --> <mappers> <mapper resource="com/itheima/dao/IUserDao.xml"></mapper> </mappers> </configuration>
test
package com.itheima.test; import com.itheima.dao.IUserDao; import com.itheima.dao.impl.UserDaoImpl; import com.itheima.domain.User; import org.apache.ibatis.io.Resources; 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.InputStream; import java.util.Date; import java.util.List; /** * @author 黑马程序员 @Company * http://www.ithiema.com * * mybatis test operation of crud * / public class MybatisTest { Private the InputStream in; Private IUserDao userDao; @Before // for performing the method is performed prior to the test public void the init () throws Exception { // 1. reads the configuration file to generate an input stream of bytes in Resources.getResourceAsStream = ( "the SqlMapConfig.xml" ); // 2. Get a SqlSessionFactory a SqlSessionFactory Factory = new new the SqlSessionFactoryBuilder () Build (in);. / / 3. use the factory object, create an object dao = userDao new new UserDaoImpl (Factory); } @After // for performing the method is performed after the test public void the destroy () throws Exception { // 6. The release resources in.close (); } / ** * Search Test * / @Test public void testFindAll () { // 5. The method of performing Search List <the User> Users = userDao.findAll (); for (the User User: Users) { System.out.println (User); } } / * * * test the save operation * / @Test public void testSave () { the User User = new new the User (); user.setUsername ( "impl User DAO" ); user.setAddress ( "Shunyi region" ); user.setSex ( "M" ); user.setBirthday ( new new a Date ()); System.out.println ( "before the save operation:" + User); // 5. The method for storing execution userDAO.saveUser (User); System.out.println ( "after a save operation:" + User ); } / ** * test update * / @Test public voidtestUpdate () { the User User = new new the User (); user.setId ( 50 ); user.setUsername ( "UserDAOImpl Update User" ); user.setAddress ( "Shunyi region" ); user.setSex ( "F" ); User .setBirthday ( new new a Date ()); // 5. The method for storing execution userDao.updateUser (User); } / ** * delete test * / @Test public void TestDelete () { // 5. The delete method userDao. deleteUser (54 is ); } / ** * test deletion * / @Test public void testFindOne () { // 5. The method of performing a query the User User = userDao.findById (50 ); System.out.println (User); } / ** * Test Fuzzy query * / @Test public void testFindByName () { // 5. The method of performing a query List <User> users = userDao.findByName ( "% King%" ); for (the User User: Users) { System.out.println (User); } } / * * * total number of test records query * / @Test public voidtestFindTotal () { // 5. The method of performing a query int COUNT = userDao.findTotal (); System.out.println (COUNT); } }
pom
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.itheima</groupId> <artifactId>day02_eesy_02mybatsiDAO</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.6</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.12</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> </dependency> </dependencies> </project>