1.  package com.itheima.mapper;
  2.  
  3.  import com.github.pagehelper.Page;
  4.  import com.github.pagehelper.PageHelper;
  5.  import com.github.pagehelper.PageInfo;
  6.  import com.itheima.domain.User;
  7.  import org.apache.ibatis.io.Resources;
  8.  import org.apache.ibatis.session.SqlSession;
  9.  import org.apache.ibatis.session.SqlSessionFactory;
  10.  import org.apache.ibatis.session.SqlSessionFactoryBuilder;
  11.  import org.junit.Test;
  12.  
  13.  import java.io.IOException;
  14.  import java.io.InputStream;
  15.  import java.util.Arrays;
  16.  import java.util.Date;
  17.  import java.util.List;
  18.  
  19.  public class UserMapperTest {
  20.  
  21.      @Test
  22.      public void pageHelperTest() throws IOException {
  23.          //获取配置
  24.          InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
  25.          //创建SqlSessionFactory
  26.          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
  27.          //创建SqlSession
  28.          SqlSession sqlSession = sqlSessionFactory.openSession();
  29.          UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  30.  
  31.          //配置分页参数
  32.          Page page = PageHelper.startPage(3, 4);
  33.  
  34.          //PageHelper只对紧跟着的第一个SQL语句起作用
  35.          List<User> byCondition = mapper.findByCondition(new User());
  36.  
  37.          //获得分页相关参数
  38.          PageInfo<User> userPageInfo = new PageInfo<>(byCondition);
  39.  
  40.          //PageInfo实现了toString方法，不用我们自己打印
  41.          System.out.println(userPageInfo);
  42.  
  43.          System.out.println("总页数=" + userPageInfo.getPages());
  44.          System.out.println("总条数=" + userPageInfo.getTotal());
  45.          System.out.println("当前页=" + userPageInfo.getPageNum());
  46.          System.out.println("页大小=" + userPageInfo.getPageSize());
  47.          System.out.println("当前页条数=" + userPageInfo.getSize());
  48.          System.out.println("是否是首页=" + userPageInfo.isIsFirstPage());
  49.          System.out.println("是否是末页=" + userPageInfo.isIsLastPage());
  50.          System.out.println("是否有上一页=" + userPageInfo.isHasPreviousPage());
  51.          System.out.println("是否有下一页=" + userPageInfo.isHasNextPage());
  52.          System.out.println("上一页=" + userPageInfo.getPrePage());
  53.          System.out.println("下一页=" + userPageInfo.getNextPage());
  54.          System.out.println("首页=" + userPageInfo.getFirstPage());
  55.          System.out.println("末页=" + userPageInfo.getLastPage());
  56.          //默认显示几个页码
  57.          System.out.println("导航页码数=" + userPageInfo.getNavigatePages());
  58.          //页码的数组
  59.          System.out.println("所有导航页码=" + Arrays.toString(userPageInfo.getNavigatepageNums()));
  60.  
  61.  //        List<User> userList = mapper.findAll();
  62.  //        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
  63.  //        for (User user : userList) {
  64.  //            System.out.println(user);
  65.  //        }
  66.  //        userList.forEach(System.out::println);
  67.          sqlSession.close();
  68.      }
  69.  
  70.      @Test
  71.      public void saveTest() throws IOException {
  72.          //获取配置
  73.          InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
  74.          //创建SqlSessionFactory
  75.          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
  76.          //创建SqlSession
  77.          SqlSession sqlSession = sqlSessionFactory.openSession();
  78.          UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  79.          //准备User
  80.          User user = new User();
  81.          user.setUsername("xxx");
  82.          user.setPassword("123");
  83.          user.setBirthday(new Date());
  84.  
  85.          int rows = mapper.save(user);
  86.          sqlSession.commit();
  87.          System.out.println(rows);
  88.  
  89.          sqlSession.close();
  90.      }
  91.  
  92.      @Test
  93.      public void findByConditionTest() throws IOException {
  94.          //获取配置
  95.          InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
  96.          //创建SqlSessionFactory
  97.          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
  98.          //创建SqlSession
  99.          SqlSession sqlSession = sqlSessionFactory.openSession();
  100.          UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  101.  
  102.          //条件
  103.          User user = new User();
  104.          user.setId(1);
  105.  //        user.setUsername("lisi");
  106.  //        user.setPassword("123");
  107.  
  108.          List<User> userList = mapper.findByCondition(user);
  109.          System.out.println(userList);
  110.  
  111.          sqlSession.close();
  112.      }
  113.  
  114.      @Test
  115.      public void findByIdsTest() throws IOException {
  116.          //获取配置
  117.          InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
  118.          //创建SqlSessionFactory
  119.          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
  120.          //创建SqlSession
  121.          SqlSession sqlSession = sqlSessionFactory.openSession();
  122.          UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  123.  
  124.  //        int[] ids = {1,2,3};
  125.          Integer[] ids = {1,2,3};
  126.          List<User> userList = mapper.findByIds(ids);
  127.          System.out.println(userList);
  128.  
  129.          sqlSession.close();
  130.      }
  131.  
  132.      @Test
  133.      public void findByIdTest() throws IOException {
  134.          //获取配置
  135.          InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
  136.          //创建SqlSessionFactory
  137.          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
  138.          //创建SqlSession
  139.          SqlSession sqlSession = sqlSessionFactory.openSession();
  140.          UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  141.  
  142.          User user = mapper.findById(1);
  143.          System.out.println(user);
  144.  
  145.          sqlSession.close();
  146.      }
  147.  
  148.      @Test
  149.      public void findAllTest() throws IOException {
  150.          //获取配置
  151.          InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
  152.          //创建SqlSessionFactory
  153.          SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
  154.          //创建SqlSession
  155.          SqlSession sqlSession = sqlSessionFactory.openSession();
  156.          UserMapper mapper = sqlSession.getMapper(UserMapper.class);
  157.  
  158.          List<User> userList = mapper.findAll();
  159.          System.out.println(userList);
  160.  
  161.          sqlSession.close();
  162.      }
  163.  }

UserMapperTest

  1.  package com.itheima.mapper;
  2.  
  3.  import com.itheima.domain.User;
  4.  
  5.  import java.util.List;
  6.  
  7.  public interface UserMapper {
  8.  
  9.      List<User> findByCondition(User condition);
  10.  
  11.      List<User> findAll();
  12.  
  13.  //    List<User> findByIds(int[] ids);
  14.      List<User> findByIds(Integer[] ids);
  15.  
  16.      User findById(int id);
  17.  
  18.      //如果不写返回值，则调用方法不会有影响行数返回值
  19.      int save(User user);
  20.  }

UserMapper

  1.  package com.itheima.handler;
  2.  
  3.  import org.apache.ibatis.type.BaseTypeHandler;
  4.  import org.apache.ibatis.type.JdbcType;
  5.  
  6.  import java.sql.CallableStatement;
  7.  import java.sql.PreparedStatement;
  8.  import java.sql.ResultSet;
  9.  import java.sql.SQLException;
  10.  import java.util.Date;
  11.  
  12.  public class DateTypeHandler extends BaseTypeHandler<Date> {
  13.      @Override
  14.      public void setNonNullParameter(PreparedStatement preparedStatement, int i, Date date, JdbcType jdbcType) throws SQLException {
  15.          preparedStatement.setLong(i, date.getTime());
  16.      }
  17.  
  18.      @Override
  19.      public Date getNullableResult(ResultSet resultSet, String s) throws SQLException {
  20.          return new Date(resultSet.getLong(s));
  21.      }
  22.  
  23.      @Override
  24.      public Date getNullableResult(ResultSet resultSet, int i) throws SQLException {
  25.          return new Date(resultSet.getLong(i));
  26.      }
  27.  
  28.      @Override
  29.      public Date getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
  30.          return new Date(callableStatement.getLong(i));
  31.      }
  32.  }

DateTypeHandler

  1.  package com.itheima.domain;
  2.  
  3.  import java.util.Date;
  4.  
  5.  /*
  6.  CREATE TABLE `user` (
  7.    `id` int(11) NOT NULL AUTO_INCREMENT,
  8.    `username` varchar(50) DEFAULT NULL,
  9.    `password` varchar(50) DEFAULT NULL,
  10.    `birthday` bigint(20) DEFAULT NULL,
  11.    PRIMARY KEY (`id`)
  12.  ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
  13.   */
  14.  public class User {
  15.      private int id;
  16.      private String username;
  17.      private String password;
  18.      private Date birthday;
  19.  
  20.      public User() {
  21.      }
  22.  
  23.      public int getId() {
  24.          return id;
  25.      }
  26.  
  27.      public void setId(int id) {
  28.          this.id = id;
  29.      }
  30.  
  31.      public String getUsername() {
  32.          return username;
  33.      }
  34.  
  35.      public void setUsername(String username) {
  36.          this.username = username;
  37.      }
  38.  
  39.      public String getPassword() {
  40.          return password;
  41.      }
  42.  
  43.      public void setPassword(String password) {
  44.          this.password = password;
  45.      }
  46.  
  47.      public Date getBirthday() {
  48.          return birthday;
  49.      }
  50.  
  51.      public void setBirthday(Date birthday) {
  52.          this.birthday = birthday;
  53.      }
  54.  
  55.      @Override
  56.      public String toString() {
  57.          return "User{" +
  58.                  "id=" + id +
  59.                  ", username='" + username + '\'' +
  60.                  ", password='" + password + '\'' +
  61.                  ", birthday=" + birthday +
  62.                  '}';
  63.      }
  64.  }

User

  1.  <?xml version="1.0" encoding="UTF-8" ?>
  2.  <!DOCTYPE configuration
  3.          PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  4.          "http://mybatis.org/dtd/mybatis-3-config.dtd">
  5.  <configuration>
  6.  
  7.      <!--外部的资源文件-->
  8.      <properties resource="jdbc.properties"></properties>
  9.  
  10.      <!--别名-->
  11.      <typeAliases>
  12.          <typeAlias type="com.itheima.domain.User" alias="user"></typeAlias>
  13.      </typeAliases>
  14.  
  15.      <!--注册类型处理器-->
  16.      <typeHandlers>
  17.          <typeHandler handler="com.itheima.handler.DateTypeHandler" ></typeHandler>
  18.      </typeHandlers>
  19.  
  20.      <!--配置分页助手插件-->
  21.      <plugins>
  22.          <plugin interceptor="com.github.pagehelper.PageHelper">
  23.              <property name="dialect" value="mysql"></property>
  24.          </plugin>
  25.      </plugins>
  26.  
  27.      <environments default="development">
  28.          <environment id="development">
  29.              <transactionManager type="JDBC"></transactionManager>
  30.              <dataSource type="POOLED">
  31.                  <property name="driver" value="${jdbc.driver}"></property>
  32.                  <property name="url" value="${jdbc.url}"></property>
  33.                  <property name="username" value="${jdbc.username}"></property>
  34.                  <property name="password" value="${jdbc.password}"></property>
  35.              </dataSource>
  36.          </environment>
  37.      </environments>
  38.  
  39.      <mappers>
  40.          <mapper resource="com/itheima/mapper/UserMapper.xml"></mapper>
  41.      </mappers>
  42.  </configuration>

SqlMapConfig.xml

  1.  <?xml version="1.0" encoding="UTF-8" ?>
  2.  <!DOCTYPE mapper
  3.          PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  4.          "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  5.  <mapper namespace="com.itheima.mapper.UserMapper">
  6.  
  7.      <insert id="save" parameterType="user">
  8.          insert into user(username, password, birthday) values(#{username},#{password},#{birthday})
  9.      </insert>
  10.  
  11.      <sql id="selectUser">
  12.          select * from user
  13.      </sql>
  14.  
  15.      <select id="findAll" resultType="user">
  16.        <include refid="selectUser"></include>
  17.      </select>
  18.  
  19.      <select id="findById" parameterType="int" resultType="user">
  20.          <include refid="selectUser"></include> where id=#{id}
  21.      </select>
  22.  
  23.      <select id="findByIds" parameterType="int[]" resultType="user">
  24.          <include refid="selectUser"></include>
  25.          <where>
  26.              <foreach collection="array" item="id" open="id in(" separator="," close=")" >
  27.                  #{id}
  28.              </foreach>
  29.          </where>
  30.      </select>
  31.  
  32.      <select id="findByCondition" parameterType="user" resultType="user">
  33.          <include refid="selectUser"></include>
  34.          <where>
  35.              <if test="id!=0">
  36.                  and id=#{id}
  37.              </if>
  38.              <if test="username!=null">
  39.                  and username=#{username}
  40.              </if>
  41.              <if test="password!=null">
  42.                  and password=#{password}
  43.              </if>
  44.          </where>
  45.      </select>
  46.  </mapper>

UserMapper.xml

  1.  <?xml version="1.0" encoding="UTF-8"?>
  2.  
  3.  <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5.    <modelVersion>4.0.0</modelVersion>
  6.  
  7.    <groupId>com.itheima</groupId>
  8.    <artifactId>mybatis-day02</artifactId>
  9.    <version>1.0-SNAPSHOT</version>
  10.    <packaging>war</packaging>
  11.  
  12.    <name>mybatis-day02 Maven Webapp</name>
  13.    <!-- FIXME change it to the project's website -->
  14.    <url>http://www.example.com</url>
  15.  
  16.    <properties>
  17.      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  18.      <maven.compiler.source>1.8</maven.compiler.source>
  19.      <maven.compiler.target>1.8</maven.compiler.target>
  20.    </properties>
  21.  
  22.    <dependencies>
  23.      <!--junit-->
  24.      <dependency>
  25.        <groupId>junit</groupId>
  26.        <artifactId>junit</artifactId>
  27.        <version>4.11</version>
  28.        <scope>test</scope>
  29.      </dependency>
  30.      <!--mybatis-->
  31.      <dependency>
  32.        <groupId>org.mybatis</groupId>
  33.        <artifactId>mybatis</artifactId>
  34.        <version>3.4.6</version>
  35.      </dependency>
  36.      <!--mysql-->
  37.      <dependency>
  38.        <groupId>mysql</groupId>
  39.        <artifactId>mysql-connector-java</artifactId>
  40.        <version>5.1.37</version>
  41.      </dependency>
  42.      <!--log4j-->
  43.      <dependency>
  44.        <groupId>log4j</groupId>
  45.        <artifactId>log4j</artifactId>
  46.        <version>1.2.17</version>
  47.      </dependency>
  48.      <!--pagehelper-->
  49.      <dependency>
  50.        <groupId>com.github.pagehelper</groupId>
  51.        <artifactId>pagehelper</artifactId>
  52.        <version>3.7.5</version>
  53.      </dependency>
  54.      <dependency>
  55.        <groupId>com.github.jsqlparser</groupId>
  56.        <artifactId>jsqlparser</artifactId>
  57.        <version>0.9.1</version>
  58.      </dependency>
  59.    </dependencies>
  60.  
  61.    <build>
  62.      <finalName>mybatis-day02</finalName>
  63.      <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
  64.        <plugins>
  65.          <plugin>
  66.            <artifactId>maven-clean-plugin</artifactId>
  67.            <version>3.1.0</version>
  68.          </plugin>
  69.          <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
  70.          <plugin>
  71.            <artifactId>maven-resources-plugin</artifactId>
  72.            <version>3.0.2</version>
  73.          </plugin>
  74.          <plugin>
  75.            <artifactId>maven-compiler-plugin</artifactId>
  76.            <version>3.8.0</version>
  77.          </plugin>
  78.          <plugin>
  79.            <artifactId>maven-surefire-plugin</artifactId>
  80.            <version>2.22.1</version>
  81.          </plugin>
  82.          <plugin>
  83.            <artifactId>maven-war-plugin</artifactId>
  84.            <version>3.2.2</version>
  85.          </plugin>
  86.          <plugin>
  87.            <artifactId>maven-install-plugin</artifactId>
  88.            <version>2.5.2</version>
  89.          </plugin>
  90.          <plugin>
  91.            <artifactId>maven-deploy-plugin</artifactId>
  92.            <version>2.8.2</version>
  93.          </plugin>
  94.        </plugins>
  95.      </pluginManagement>
  96.    </build>
  97.  </project>

pom.xml

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

jdbc.properties

  1. ### direct log messages to stdout ###
  2. log4j.appender.stdout=org.apache.log4j.ConsoleAppender
  3. log4j.appender.stdout.Target=System.err
  4. log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
  5. log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
  6.  
  7. ### direct messages to file mylog.log ###
  8. log4j.appender.file=org.apache.log4j.FileAppender
  9. log4j.appender.file.File=c:/mylog.log
  10. log4j.appender.file.layout=org.apache.log4j.PatternLayout
  11. log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
  12.  
  13. ### set log levels - for more verbose logging change 'info' to 'debug' ###
  14.  
  15. log4j.rootLogger=debug, stdout

log4j.properties

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