黑马MyBatisday2 MyBatis Dao层实现 接口代理实现&传统实现 动态SQL和SQL抽取 自定义类型处理 分页插件PageHelper

 package com.itheima.mapper;

 import com.github.pagehelper.Page;
 import com.github.pagehelper.PageHelper;
 import com.github.pagehelper.PageInfo;
 import com.itheima.domain.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.junit.Test;

 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Arrays;
 import java.util.Date;
 import java.util.List;

 public class UserMapperTest {

     @Test
     public void pageHelperTest() throws IOException {
         //获取配置
         InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
         //创建SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
         //创建SqlSession
         SqlSession sqlSession = sqlSessionFactory.openSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);

         //配置分页参数
         Page page = PageHelper.startPage(3, 4);

         //PageHelper只对紧跟着的第一个SQL语句起作用
         List<User> byCondition = mapper.findByCondition(new User());

         //获得分页相关参数
         PageInfo<User> userPageInfo = new PageInfo<>(byCondition);

         //PageInfo实现了toString方法，不用我们自己打印
         System.out.println(userPageInfo);

         System.out.println("总页数=" + userPageInfo.getPages());
         System.out.println("总条数=" + userPageInfo.getTotal());
         System.out.println("当前页=" + userPageInfo.getPageNum());
         System.out.println("页大小=" + userPageInfo.getPageSize());
         System.out.println("当前页条数=" + userPageInfo.getSize());
         System.out.println("是否是首页=" + userPageInfo.isIsFirstPage());
         System.out.println("是否是末页=" + userPageInfo.isIsLastPage());
         System.out.println("是否有上一页=" + userPageInfo.isHasPreviousPage());
         System.out.println("是否有下一页=" + userPageInfo.isHasNextPage());
         System.out.println("上一页=" + userPageInfo.getPrePage());
         System.out.println("下一页=" + userPageInfo.getNextPage());
         System.out.println("首页=" + userPageInfo.getFirstPage());
         System.out.println("末页=" + userPageInfo.getLastPage());
         //默认显示几个页码
         System.out.println("导航页码数=" + userPageInfo.getNavigatePages());
         //页码的数组
         System.out.println("所有导航页码=" + Arrays.toString(userPageInfo.getNavigatepageNums()));

 //        List<User> userList = mapper.findAll();
 //        System.out.println(userList);//传回的并不是Collection中List的实现类，而是自定义List实现类，toString方法处理有区别
 //        for (User user : userList) {
 //            System.out.println(user);
 //        }
 //        userList.forEach(System.out::println);
         sqlSession.close();
     }

     @Test
     public void saveTest() throws IOException {
         //获取配置
         InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
         //创建SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
         //创建SqlSession
         SqlSession sqlSession = sqlSessionFactory.openSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);
         //准备User
         User user = new User();
         user.setUsername("xxx");
         user.setPassword("123");
         user.setBirthday(new Date());

         int rows = mapper.save(user);
         sqlSession.commit();
         System.out.println(rows);

         sqlSession.close();
     }

     @Test
     public void findByConditionTest() throws IOException {
         //获取配置
         InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
         //创建SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
         //创建SqlSession
         SqlSession sqlSession = sqlSessionFactory.openSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);

         //条件
         User user = new User();
         user.setId(1);
 //        user.setUsername("lisi");
 //        user.setPassword("123");

         List<User> userList = mapper.findByCondition(user);
         System.out.println(userList);

         sqlSession.close();
     }

     @Test
     public void findByIdsTest() throws IOException {
         //获取配置
         InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
         //创建SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
         //创建SqlSession
         SqlSession sqlSession = sqlSessionFactory.openSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);

 //        int[] ids = {1,2,3};
         Integer[] ids = {1,2,3};
         List<User> userList = mapper.findByIds(ids);
         System.out.println(userList);

         sqlSession.close();
     }

     @Test
     public void findByIdTest() throws IOException {
         //获取配置
         InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
         //创建SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
         //创建SqlSession
         SqlSession sqlSession = sqlSessionFactory.openSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);

         User user = mapper.findById(1);
         System.out.println(user);

         sqlSession.close();
     }

     @Test
     public void findAllTest() throws IOException {
         //获取配置
         InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
         //创建SqlSessionFactory
         SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
         //创建SqlSession
         SqlSession sqlSession = sqlSessionFactory.openSession();
         UserMapper mapper = sqlSession.getMapper(UserMapper.class);

         List<User> userList = mapper.findAll();
         System.out.println(userList);

         sqlSession.close();
     }
 }

UserMapperTest

 package com.itheima.mapper;

 import com.itheima.domain.User;

 import java.util.List;

 public interface UserMapper {

     List<User> findByCondition(User condition);

     List<User> findAll();

 //    List<User> findByIds(int[] ids);
     List<User> findByIds(Integer[] ids);

     User findById(int id);

     //如果不写返回值，则调用方法不会有影响行数返回值
     int save(User user);
 }

UserMapper

 package com.itheima.handler;

 import org.apache.ibatis.type.BaseTypeHandler;
 import org.apache.ibatis.type.JdbcType;

 import java.sql.CallableStatement;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.Date;

 public class DateTypeHandler extends BaseTypeHandler<Date> {
     @Override
     public void setNonNullParameter(PreparedStatement preparedStatement, int i, Date date, JdbcType jdbcType) throws SQLException {
         preparedStatement.setLong(i, date.getTime());
     }

     @Override
     public Date getNullableResult(ResultSet resultSet, String s) throws SQLException {
         return new Date(resultSet.getLong(s));
     }

     @Override
     public Date getNullableResult(ResultSet resultSet, int i) throws SQLException {
         return new Date(resultSet.getLong(i));
     }

     @Override
     public Date getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
         return new Date(callableStatement.getLong(i));
     }
 }

DateTypeHandler

 package com.itheima.domain;

 import java.util.Date;

 /*
 CREATE TABLE `user` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `username` varchar(50) DEFAULT NULL,
   `password` varchar(50) DEFAULT NULL,
   `birthday` bigint(20) DEFAULT NULL,
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
  */
 public class User {
     private int id;
     private String username;
     private String password;
     private Date birthday;

     public User() {
     }

     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 getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public Date getBirthday() {
         return birthday;
     }

     public void setBirthday(Date birthday) {
         this.birthday = birthday;
     }

     @Override
     public String toString() {
         return "User{" +
                 "id=" + id +
                 ", username='" + username + '\'' +
                 ", password='" + password + '\'' +
                 ", birthday=" + birthday +
                 '}';
     }
 }

User

 <?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>

     <!--外部的资源文件-->
     <properties resource="jdbc.properties"></properties>

     <!--别名-->
     <typeAliases>
         <typeAlias type="com.itheima.domain.User" alias="user"></typeAlias>
     </typeAliases>

     <!--注册类型处理器-->
     <typeHandlers>
         <typeHandler handler="com.itheima.handler.DateTypeHandler" ></typeHandler>
     </typeHandlers>

     <!--配置分页助手插件-->
     <plugins>
         <plugin interceptor="com.github.pagehelper.PageHelper">
             <property name="dialect" value="mysql"></property>
         </plugin>
     </plugins>

     <environments default="development">
         <environment id="development">
             <transactionManager type="JDBC"></transactionManager>
             <dataSource type="POOLED">
                 <property name="driver" value="${jdbc.driver}"></property>
                 <property name="url" value="${jdbc.url}"></property>
                 <property name="username" value="${jdbc.username}"></property>
                 <property name="password" value="${jdbc.password}"></property>
             </dataSource>
         </environment>
     </environments>

     <mappers>
         <mapper resource="com/itheima/mapper/UserMapper.xml"></mapper>
     </mappers>
 </configuration>

SqlMapConfig.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">
 <mapper namespace="com.itheima.mapper.UserMapper">

     <insert id="save" parameterType="user">
         insert into user(username, password, birthday) values(#{username},#{password},#{birthday})
     </insert>

     <sql id="selectUser">
         select * from user
     </sql>

     <select id="findAll" resultType="user">
       <include refid="selectUser"></include>
     </select>

     <select id="findById" parameterType="int" resultType="user">
         <include refid="selectUser"></include> where id=#{id}
     </select>

     <select id="findByIds" parameterType="int[]" resultType="user">
         <include refid="selectUser"></include>
         <where>
             <foreach collection="array" item="id" open="id in(" separator="," close=")" >
                 #{id}
             </foreach>
         </where>
     </select>

     <select id="findByCondition" parameterType="user" resultType="user">
         <include refid="selectUser"></include>
         <where>
             <if test="id!=0">
                 and id=#{id}
             </if>
             <if test="username!=null">
                 and username=#{username}
             </if>
             <if test="password!=null">
                 and password=#{password}
             </if>
         </where>
     </select>
 </mapper>

UserMapper.xml

 <?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>mybatis-day02</artifactId>
   <version>1.0-SNAPSHOT</version>
   <packaging>war</packaging>

   <name>mybatis-day02 Maven Webapp</name>
   <!-- FIXME change it to the project's website -->
   <url>http://www.example.com</url>

   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
   </properties>

   <dependencies>
     <!--junit-->
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.11</version>
       <scope>test</scope>
     </dependency>
     <!--mybatis-->
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>3.4.6</version>
     </dependency>
     <!--mysql-->
     <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.37</version>
     </dependency>
     <!--log4j-->
     <dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
       <version>1.2.17</version>
     </dependency>
     <!--pagehelper-->
     <dependency>
       <groupId>com.github.pagehelper</groupId>
       <artifactId>pagehelper</artifactId>
       <version>3.7.5</version>
     </dependency>
     <dependency>
       <groupId>com.github.jsqlparser</groupId>
       <artifactId>jsqlparser</artifactId>
       <version>0.9.1</version>
     </dependency>
   </dependencies>

   <build>
     <finalName>mybatis-day02</finalName>
     <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
       <plugins>
         <plugin>
           <artifactId>maven-clean-plugin</artifactId>
           <version>3.1.0</version>
         </plugin>
         <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
         <plugin>
           <artifactId>maven-resources-plugin</artifactId>
           <version>3.0.2</version>
         </plugin>
         <plugin>
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.8.0</version>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>
           <version>2.22.1</version>
         </plugin>
         <plugin>
           <artifactId>maven-war-plugin</artifactId>
           <version>3.2.2</version>
         </plugin>
         <plugin>
           <artifactId>maven-install-plugin</artifactId>
           <version>2.5.2</version>
         </plugin>
         <plugin>
           <artifactId>maven-deploy-plugin</artifactId>
           <version>2.8.2</version>
         </plugin>
       </plugins>
     </pluginManagement>
   </build>
 </project>

pom.xml

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3307/test
jdbc.username=root
jdbc.password=root

jdbc.properties

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=debug, stdout

log4j.properties