Bajo sql dinámico y paginación (paginación mybatis y caracteres especiales)

Mobile 2023-09-30 19:26:01 views: null
  • paginación mybatis
  • Caracteres especiales de mybatis.

1. Paginación Mybatis (selectByLikebname es un ejemplo de cómo agregar dos campos para paginación; like4 es un ejemplo de cómo llamar a pageHelp para paginación)

¿Por qué reescribir la paginación de mybatis?

   La función de paginación de Mybatis es muy débil, se basa en la paginación de memoria (busque todos los registros y luego obtenga los resultados de acuerdo con el desplazamiento y el límite de límite), dicha paginación es básicamente inútil cuando la cantidad de datos es grande.

Pasos para usar el complemento de paginación

  1. Importar dependencias de pom
  2. Interceptor de configuración Mybatis.cfg.xml
  3. Paginación usando PageHelper
  4. Manejar resultados paginados
//pom依赖
<?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>org.example</groupId>
  <artifactId>mybatis_01</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>mybatis01 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <!-- ********************** junit单元测试依赖 ********************** -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- ********************** Java Servlet API  ********************** -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.0</version>
      <scope>provided</scope>
    </dependency>

    <!-- ********************** Mybatis依赖 ********************** -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.5</version>
    </dependency>

    <!-- ********************** Mysql JDBC驱动 ********************** -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.44</version>
    </dependency>

    <!-- **********************  日志配置  ********************** -->
    <!--记得修改mybatis.cfg.xml添加如下内容-->
    <!--<setting name="logImpl" value="LOG4J2"/>-->
    <!--核心log4j2jar包-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>2.9.1</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>2.9.1</version>
    </dependency>
    <!--web工程需要包含log4j-web，非web工程不需要-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>2.9.1</version>
    </dependency>

    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.2</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>compile</scope>
    </dependency>

  </dependencies>

  <build>
    <finalName>mybatis_01</finalName>
    <resources>
      <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>jdbc.properties</include>
          <include>*.xml</include>
        </includes>
      </resource>
    </resources>

    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.2</version>
          <dependencies>
            <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>5.1.44</version>
            </dependency>
          </dependencies>
          <configuration>
            <overwrite>true</overwrite>
          </configuration>
        </plugin>

        <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>

<?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>
    <!-- 引入外部配置文件 -->
    <properties resource="jdbc.properties"/>

    <settings>
        <setting name="logImpl" value="LOG4J2"/>
    </settings>

    <!-- 别名 -->
    <typeAliases>
        <!--<typeAlias type="com.javaxl.model.Book" alias="Book"/>-->
    </typeAliases>
<plugins>
    <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
</plugins>
    <!-- 配置mybatis运行环境 -->
    <environments default="development">
        <environment id="development">
            <!-- type="JDBC" 代表使用JDBC的提交和回滚来管理事务 -->
            <transactionManager type="jdbc"/>

            <!-- mybatis提供了3种数据源类型，分别是：POOLED,UNPOOLED,JNDI -->
            <!-- POOLED 表示支持JDBC数据源连接池 -->
            <!-- UNPOOLED 表示不支持数据源连接池 -->
            <!-- JNDI 表示支持外部数据源连接池 -->
            <dataSource type="POOLED">
                <property name="driver"
                          value="${jdbc.driver}"/>
                <property name="url"
                          value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="com/zlj/mapper/BookMapper.xml"/>
    </mappers>
</configuration>

package com.zlj.utils;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;

public class PageBean implements Serializable {

	private static final long serialVersionUID = 2422581023658455731L;

	//页码
	private int page=1;
	//每页显示记录数
	private int rows=10;
	//总记录数
	private int total=0;
	//是否分页
	private boolean isPagination=true;
	//上一次的请求路径
	private String url;
	//获取所有的请求参数
	private Map<String,String[]> map;
	
	public PageBean() {
		super();
	}
	
	//设置请求参数
	public void setRequest(HttpServletRequest req) {
		String page=req.getParameter("page");
		String rows=req.getParameter("rows");
		String pagination=req.getParameter("pagination");
		this.setPage(page);
		this.setRows(rows);
		this.setPagination(pagination);
		this.url=req.getContextPath()+req.getServletPath();
		this.map=req.getParameterMap();
	}
	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public Map<String, String[]> getMap() {
		return map;
	}

	public void setMap(Map<String, String[]> map) {
		this.map = map;
	}

	public int getPage() {
		return page;
	}

	public void setPage(int page) {
		this.page = page;
	}
	
	public void setPage(String page) {
		if(null!=page&&!"".equals(page.trim()))
			this.page = Integer.parseInt(page);
	}

	public int getRows() {
		return rows;
	}

	public void setRows(int rows) {
		this.rows = rows;
	}
	
	public void setRows(String rows) {
		if(null!=rows&&!"".equals(rows.trim()))
			this.rows = Integer.parseInt(rows);
	}

	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}
	
	public void setTotal(String total) {
		this.total = Integer.parseInt(total);
	}

	public boolean isPagination() {
		return isPagination;
	}
	
	public void setPagination(boolean isPagination) {
		this.isPagination = isPagination;
	}
	
	public void setPagination(String isPagination) {
		if(null!=isPagination&&!"".equals(isPagination.trim()))
			this.isPagination = Boolean.parseBoolean(isPagination);
	}
	
	/**
	 * 获取分页起始标记位置
	 * @return
	 */
	public int getStartIndex() {
		//(当前页码-1)*显示记录数
		return (this.getPage()-1)*this.rows;
	}
	
	/**
	 * 末页
	 * @return
	 */
	public int getMaxPage() {
		int totalpage=this.total/this.rows;
		if(this.total%this.rows!=0)
			totalpage++;
		return totalpage;
	}
	
	/**
	 * 下一页
	 * @return
	 */
	public int getNextPage() {
		int nextPage=this.page+1;
		if(this.page>=this.getMaxPage())
			nextPage=this.getMaxPage();
		return nextPage;
	}
	
	/**
	 * 上一页
	 * @return
	 */
	public int getPreivousPage() {
		int previousPage=this.page-1;
		if(previousPage<1)
			previousPage=1;
		return previousPage;
	}

	@Override
	public String toString() {
		return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination
				+ "]";
	}
}

<?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.zlj.mapper.BookMapper">
  <resultMap id="BaseResultMap" type="com.zlj.model.Book">
    <constructor>
      <idArg column="bid" javaType="java.lang.Integer" jdbcType="INTEGER" />
      <arg column="bname" javaType="java.lang.String" jdbcType="VARCHAR" />
      <arg column="price" javaType="java.lang.Float" jdbcType="REAL" />
    </constructor>
  </resultMap>
  <sql id="Base_Column_List">
    bid, bname, price
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.zlj.model.Book">
    insert into t_mvc_book (bid, bname, price
      )
    values (#{bid,jdbcType=INTEGER}, #{bname,jdbcType=VARCHAR}, #{price,jdbcType=REAL}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.zlj.model.Book">
    insert into t_mvc_book
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="bid != null">
        bid,
      </if>
      <if test="bname != null">
        bname,
      </if>
      <if test="price != null">
        price,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="bid != null">
        #{bid,jdbcType=INTEGER},
      </if>
      <if test="bname != null">
        #{bname,jdbcType=VARCHAR},
      </if>
      <if test="price != null">
        #{price,jdbcType=REAL},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.zlj.model.Book">
    update t_mvc_book
    <set>
      <if test="bname != null">
        bname = #{bname,jdbcType=VARCHAR},
      </if>
      <if test="price != null">
        price = #{price,jdbcType=REAL},
      </if>
    </set>
    where bid = #{bid,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.zlj.model.Book">
    update t_mvc_book
    set bname = #{bname,jdbcType=VARCHAR},
      price = #{price,jdbcType=REAL}
    where bid = #{bid,jdbcType=INTEGER}
  </update>
  <select id="selectByBids" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </select>
<select id="like1" parameterType="java.lang.String" resultType="com.zlj.model.Book">
  select
  <include refid="Base_Column_List" />
  from t_mvc_book
  where bname like #{bname}
</select>
  <select id="like2" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like '${bname}'
  </select>
  <select id="like3" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like concat('%',#{bname},'%')
  </select>
  <select id="list01" resultType="com.zlj.model.Book" >
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
  </select>
  <select id="list02" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
  </select>

<select id="list03" resultType="java.util.Map" parameterType="java.util.Map">
  select s.*,sc.cid,sc.score from t_mysql_student s,t_mysql_score sc where s.sid=sc.sid and sc.sid=#{sid} and sc.cid=#{cid}
</select>
  <select id="list04" resultType="java.util.Map" parameterType="java.util.Map">
  select s.*,sc.cid,sc.score from t_mysql_student s,t_mysql_score sc where s.sid=sc.sid
</select>
  <select id="bname1" parameterType="java.lang.Integer" resultType="java.lang.String">
    select
    bname
    from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </select>
  <select id="bname2" parameterType="java.lang.String" resultType="java.lang.String">
    select
    bname
    from t_mvc_book
    where bname like concat('%',#{bname},'%')
  </select>
  <select id="selectByLikebname" parameterType="java.util.Map" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like #{bname} limit #{start},#{size}
  </select>
  <select id="like4" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like concat('%',#{bname},'%')
  </select>
</mapper>
package com.zlj.mapper;

import com.zlj.model.Book;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface BookMapper {
    int deleteByPrimaryKey(Integer bid);

    int insert(Book record);

    int insertSelective(Book record);

    Book selectByPrimaryKey(Integer bid);

    int updateByPrimaryKeySelective(Book record);

    int updateByPrimaryKey(Book record);

    List<Book> selectByBids(@Param("bids") List bids);

    List<Book> like1(@Param("bname") String bname);

    List<Book> like2(@Param("bname") String bname);

    List<Book> like3(@Param("bname") String bname);

    List<Book> list01();

    List<Book> list02();

    Map list03(Map map);

    List<Map> list04(Map map);

    String bname1(@Param("bid") Integer bid);

    List<String> bname2(@Param("bname") String bname);

    List<Book> selectByLikebname(Map map);

    List<Book> like4(@Param("bname") String bname);
}
package com.zlj.biz;

import com.zlj.mapper.BookMapper;
import com.zlj.model.Book;
import com.zlj.utils.PageBean;

import java.util.List;
import java.util.Map;

public interface BookBiz {
    int deleteByPrimaryKey(Integer bid);

    int insert(Book record);

    int insertSelective(Book record);

    Book selectByPrimaryKey(Integer bid);

    int updateByPrimaryKeySelective(Book record);

    int updateByPrimaryKey(Book record);

    BookMapper setBookMapper(BookMapper mapper);

    List<Book> selectByBids(List bids);

    List<Book> like1(String bname);
    List<Book> like2(String bname);
    List<Book> like3(String bname);

    List<Book> list01();
    List<Book> list02();

    Map list03(Map map);

    List<Map> list04(Map map);

    String bname1(Integer bid);

    List<String> bname2(String bname);

    List<Book> selectByLikebname(Map map);

    List<Book> like4(String bname, PageBean pageBean);
}
package com.zlj.biz.impl;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.zlj.biz.BookBiz;
import com.zlj.mapper.BookMapper;
import com.zlj.model.Book;
import com.zlj.utils.PageBean;

import java.util.List;
import java.util.Map;

/**
 * @author zlj
 * @create 2023-08-21 8:49
 */
public class BookBizImpl implements BookBiz {

    private  BookMapper bookMapper;

    public BookMapper getBookMapper() {
        return bookMapper;
    }

    @Override
    public int deleteByPrimaryKey(Integer bid) {
        return bookMapper.deleteByPrimaryKey(bid);
    }

    @Override
    public int insert(Book record) {
        return bookMapper.insert(record);
    }

    @Override
    public int insertSelective(Book record) {
        return bookMapper.insertSelective(record);
    }

    @Override
    public Book selectByPrimaryKey(Integer bid) {
        return bookMapper.selectByPrimaryKey(bid);
    }

    @Override
    public int updateByPrimaryKeySelective(Book record) {
        return bookMapper.updateByPrimaryKeySelective(record);
    }

    @Override
    public int updateByPrimaryKey(Book record) {
        return bookMapper.updateByPrimaryKey(record);
    }

    @Override
    public BookMapper setBookMapper(BookMapper mapper) {
        return this.bookMapper = mapper;
    }

    @Override
    public List<Book> selectByBids(List bids) {
        return bookMapper.selectByBids(bids);
    }

    @Override
    public List<Book> like1(String bname) {
        return bookMapper.like1(bname);
    }

    @Override
    public List<Book> like2(String bname) {
        return bookMapper.like2(bname);
    }

    @Override
    public List<Book> like3(String bname) {
        return bookMapper.like3(bname);
    }

    @Override
    public List<Book> list01() {
        return bookMapper.list01();
    }

    @Override
    public List<Book> list02() {
        return bookMapper.list02();
    }

    @Override
    public Map list03(Map map){
    return bookMapper.list03(map);
    }
    @Override
    public List<Map> list04(Map map){
    return bookMapper.list04(map);
    }
    @Override
    public String bname1(Integer bid) {
        return bookMapper.bname1(bid);
    }
    @Override
    public List<String> bname2(String bname) {
        return bookMapper.bname2(bname);
    }

    @Override
    public List<Book> selectByLikebname(Map map) {
        return bookMapper.selectByLikebname(map);
    }

    @Override
    public List<Book> like4(String bname, PageBean pageBean) {
        if (pageBean!=null&&pageBean.isPagination()) {
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }
        List<Book> books = bookMapper.like4(bname);
        if (pageBean!=null && pageBean.isPagination()) {
            PageInfo<Book> info = new PageInfo<>(books);
            System.out.println("当前页：" + info.getPageNum());
            System.out.println("展示记录数：" + info.getPageSize());
            System.out.println("符合查询的总页数：" + info.getTotal());
            pageBean.setTotal((int)info.getTotal());
        }
        return books;
    }

}
package com.zlj.demo;


import com.zlj.biz.impl.BookBizImpl;
import com.zlj.mapper.BookMapper;
import com.zlj.model.Book;
import com.zlj.utils.PageBean;
import com.zlj.utils.SessionUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author zlj
 * @create 2023-08-21 9:07
 */

public class demo1 {
    private SqlSession sqlSession;
    private BookBizImpl bookBiz;

    @Before
    public void a(){
        System.out.println("执行测试方法之前会执行的初始化代码块");
        sqlSession= SessionUtil.openSession();
        BookBizImpl bookBiz=new BookBizImpl();
        BookMapper mapper=sqlSession.getMapper(BookMapper.class);
        bookBiz.setBookMapper(mapper);
        this.bookBiz=bookBiz;
    }
    @After
    public void b(){
        System.out.println("执行测试方法之后会执行");
        sqlSession.commit();
    }
    @Test
    public void test1(){
        System.out.println("测试方法。。。");
        Book book = bookBiz.selectByPrimaryKey(33);
        System.out.println(book);
    }
@Test
    public void test2(){
        bookBiz.deleteByPrimaryKey(34);
    }
@Test
public void testById(){
    List<Integer> bids = Arrays.asList(new Integer[]{56, 57, 58, 59, 60});
    bookBiz.selectByBids(bids).forEach(System.out::print);//jdk1.8新特性
//    for (Book selectByBid : bookBiz.selectByBids(bids)) {
//        System.out.println(selectByBid);
//    }
}
    @Test
    public void testlike1(){
        bookBiz.like1("%圣墟%").forEach(System.out::print);//jdk1.8新特性
    }
    @Test
    public void testlike2(){
        bookBiz.like2("%圣墟%").forEach(System.out::print);//jdk1.8新特性
    }
    @Test
    public void testlike3(){
        bookBiz.like3("%圣墟%").forEach(System.out::print);//jdk1.8新特性
    }

    @Test
    public void testlist01(){
        bookBiz.list01().forEach(System.out::print);//jdk1.8新特性
    }
    @Test
    public void testlist02(){
        bookBiz.list02().forEach(System.out::print);//jdk1.8新特性
    }


    @Test
    public void testlist03(){
        Map map=new HashMap();
        map.put("sid","01");
        map.put("cid","01");
        System.out.println(bookBiz.list03(map));
    }
    @Test
    public void testlist04(){
        Map map=new HashMap();
        map.put("sid","01");
        map.put("cid","01");
        bookBiz.list04(map).forEach(System.out::print);
    }
    @Test
    public void testbname1(){
        System.out.println(bookBiz.bname1(66));
    }
    @Test
    public void testbname2(){
        bookBiz.bname2("圣墟").forEach(System.out::print);
    }
    @Test
    public void selectByLikebname(){
        Map map=new HashMap();
        map.put("bname","%圣墟%");
        map.put("start",30);
        map.put("size",10);
        this.bookBiz.selectByLikebname(map).forEach(System.out::println);
    }
    @Test
    public void testlike04(){
        PageBean pageBean=new PageBean();
        pageBean.setPage(2);
        pageBean.setRows(20);
//        pageBean.setPagination(false);  //不分页
        bookBiz.like4("圣墟",pageBean).forEach(System.out::println);
    }
}

 2.Caracteres especiales de mybatis (tres tipos, ejemplo: queryByMinMax)

<?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.zlj.mapper.BookMapper">
  <resultMap id="BaseResultMap" type="com.zlj.model.Book">
    <constructor>
      <idArg column="bid" javaType="java.lang.Integer" jdbcType="INTEGER" />
      <arg column="bname" javaType="java.lang.String" jdbcType="VARCHAR" />
      <arg column="price" javaType="java.lang.Float" jdbcType="REAL" />
    </constructor>
  </resultMap>
  <sql id="Base_Column_List">
    bid, bname, price
  </sql>
  <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </delete>
  <insert id="insert" parameterType="com.zlj.model.Book">
    insert into t_mvc_book (bid, bname, price
      )
    values (#{bid,jdbcType=INTEGER}, #{bname,jdbcType=VARCHAR}, #{price,jdbcType=REAL}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.zlj.model.Book">
    insert into t_mvc_book
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="bid != null">
        bid,
      </if>
      <if test="bname != null">
        bname,
      </if>
      <if test="price != null">
        price,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="bid != null">
        #{bid,jdbcType=INTEGER},
      </if>
      <if test="bname != null">
        #{bname,jdbcType=VARCHAR},
      </if>
      <if test="price != null">
        #{price,jdbcType=REAL},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.zlj.model.Book">
    update t_mvc_book
    <set>
      <if test="bname != null">
        bname = #{bname,jdbcType=VARCHAR},
      </if>
      <if test="price != null">
        price = #{price,jdbcType=REAL},
      </if>
    </set>
    where bid = #{bid,jdbcType=INTEGER}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.zlj.model.Book">
    update t_mvc_book
    set bname = #{bname,jdbcType=VARCHAR},
      price = #{price,jdbcType=REAL}
    where bid = #{bid,jdbcType=INTEGER}
  </update>
  <select id="selectByBids" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </select>
<select id="like1" parameterType="java.lang.String" resultType="com.zlj.model.Book">
  select
  <include refid="Base_Column_List" />
  from t_mvc_book
  where bname like #{bname}
</select>
  <select id="like2" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like '${bname}'
  </select>
  <select id="like3" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like concat('%',#{bname},'%')
  </select>
  <select id="list01" resultType="com.zlj.model.Book" >
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
  </select>
  <select id="list02" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
  </select>

<select id="list03" resultType="java.util.Map" parameterType="java.util.Map">
  select s.*,sc.cid,sc.score from t_mysql_student s,t_mysql_score sc where s.sid=sc.sid and sc.sid=#{sid} and sc.cid=#{cid}
</select>
  <select id="list04" resultType="java.util.Map" parameterType="java.util.Map">
  select s.*,sc.cid,sc.score from t_mysql_student s,t_mysql_score sc where s.sid=sc.sid
</select>
  <select id="bname1" parameterType="java.lang.Integer" resultType="java.lang.String">
    select
    bname
    from t_mvc_book
    where bid = #{bid,jdbcType=INTEGER}
  </select>
  <select id="bname2" parameterType="java.lang.String" resultType="java.lang.String">
    select
    bname
    from t_mvc_book
    where bname like concat('%',#{bname},'%')
  </select>
  <select id="selectByLikebname" parameterType="java.util.Map" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like #{bname} limit #{start},#{size}
  </select>
  <select id="like4" parameterType="java.lang.String" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    where bname like concat('%',#{bname},'%')
  </select>
  <select id="queryByMinMax" parameterType="com.zlj.dto.BookDto" resultType="com.zlj.model.Book">
    select
    <include refid="Base_Column_List" />
    from t_mvc_book
    <if test="start != null">
<!--    <![CDATA[  create_time > #{min} and create_time < #{max} ]]>-->
<!--    <if test="aaa">                                                //第三种多表查询-->
<!--    <![CDATA[  create_time > #{min} and create_time < #{max} ]]>-->

     where price > #{min} and price < #{max}   //第一种

<!--    where <![CDATA[-->
<!--    price < #{max} and price > #{min}-->      //第二种
<!--    ]]>-->
  </select>
</mapper>
package com.zlj.dto;

import com.zlj.model.Book;

/**
 * @author zlj
 * @create 2023-08-24 23:59
 */
public class BookDto extends Book {
    private float max;
    private float min;

    public float getMax() {
        return max;
    }

    public void setMax(float max) {
        this.max = max;
    }

    public float getMin() {
        return min;
    }

    public void setMin(float min) {
        this.min = min;
    }

    public BookDto(Integer bid, String bname, Float price) {
        super(bid, bname, price);
    }

    public BookDto() {
    }
}

package com.zlj.mapper;

import com.zlj.dto.BookDto;
import com.zlj.model.Book;
import org.apache.ibatis.annotations.Param;

import java.util.List;
import java.util.Map;

public interface BookMapper {
    int deleteByPrimaryKey(Integer bid);

    int insert(Book record);

    int insertSelective(Book record);

    Book selectByPrimaryKey(Integer bid);

    int updateByPrimaryKeySelective(Book record);

    int updateByPrimaryKey(Book record);

    List<Book> selectByBids(@Param("bids") List bids);

    List<Book> like1(@Param("bname") String bname);

    List<Book> like2(@Param("bname") String bname);

    List<Book> like3(@Param("bname") String bname);

    List<Book> list01();

    List<Book> list02();

    Map list03(Map map);

    List<Map> list04(Map map);

    String bname1(@Param("bid") Integer bid);

    List<String> bname2(@Param("bname") String bname);

    List<Book> selectByLikebname(Map map);

    List<Book> like4(@Param("bname") String bname);

    List<Book> queryByMinMax(BookDto bookDto);
}
package com.zlj.biz;

import com.zlj.dto.BookDto;
import com.zlj.mapper.BookMapper;
import com.zlj.model.Book;
import com.zlj.utils.PageBean;

import java.util.List;
import java.util.Map;

public interface BookBiz {
    int deleteByPrimaryKey(Integer bid);

    int insert(Book record);

    int insertSelective(Book record);

    Book selectByPrimaryKey(Integer bid);

    int updateByPrimaryKeySelective(Book record);

    int updateByPrimaryKey(Book record);

    BookMapper setBookMapper(BookMapper mapper);

    List<Book> selectByBids(List bids);

    List<Book> like1(String bname);
    List<Book> like2(String bname);
    List<Book> like3(String bname);

    List<Book> list01();
    List<Book> list02();

    Map list03(Map map);

    List<Map> list04(Map map);

    String bname1(Integer bid);

    List<String> bname2(String bname);

    List<Book> selectByLikebname(Map map);

    List<Book> like4(String bname, PageBean pageBean);

    List<Book> queryByMinMax(BookDto bookDto);
}
package com.zlj.biz.impl;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.zlj.biz.BookBiz;
import com.zlj.dto.BookDto;
import com.zlj.mapper.BookMapper;
import com.zlj.model.Book;
import com.zlj.utils.PageBean;

import java.util.List;
import java.util.Map;

/**
 * @author zlj
 * @create 2023-08-21 8:49
 */
public class BookBizImpl implements BookBiz {

    private  BookMapper bookMapper;

    public BookMapper getBookMapper() {
        return bookMapper;
    }

    @Override
    public int deleteByPrimaryKey(Integer bid) {
        return bookMapper.deleteByPrimaryKey(bid);
    }

    @Override
    public int insert(Book record) {
        return bookMapper.insert(record);
    }

    @Override
    public int insertSelective(Book record) {
        return bookMapper.insertSelective(record);
    }

    @Override
    public Book selectByPrimaryKey(Integer bid) {
        return bookMapper.selectByPrimaryKey(bid);
    }

    @Override
    public int updateByPrimaryKeySelective(Book record) {
        return bookMapper.updateByPrimaryKeySelective(record);
    }

    @Override
    public int updateByPrimaryKey(Book record) {
        return bookMapper.updateByPrimaryKey(record);
    }

    @Override
    public BookMapper setBookMapper(BookMapper mapper) {
        return this.bookMapper = mapper;
    }

    @Override
    public List<Book> selectByBids(List bids) {
        return bookMapper.selectByBids(bids);
    }

    @Override
    public List<Book> like1(String bname) {
        return bookMapper.like1(bname);
    }

    @Override
    public List<Book> like2(String bname) {
        return bookMapper.like2(bname);
    }

    @Override
    public List<Book> like3(String bname) {
        return bookMapper.like3(bname);
    }

    @Override
    public List<Book> list01() {
        return bookMapper.list01();
    }

    @Override
    public List<Book> list02() {
        return bookMapper.list02();
    }

    @Override
    public Map list03(Map map){
    return bookMapper.list03(map);
    }
    @Override
    public List<Map> list04(Map map){
    return bookMapper.list04(map);
    }
    @Override
    public String bname1(Integer bid) {
        return bookMapper.bname1(bid);
    }
    @Override
    public List<String> bname2(String bname) {
        return bookMapper.bname2(bname);
    }

    @Override
    public List<Book> selectByLikebname(Map map) {
        return bookMapper.selectByLikebname(map);
    }

    @Override
    public List<Book> like4(String bname, PageBean pageBean) {
        if (pageBean!=null&&pageBean.isPagination()) {
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }
        List<Book> books = bookMapper.like4(bname);
        if (pageBean!=null && pageBean.isPagination()) {
            PageInfo<Book> info = new PageInfo<>(books);
            System.out.println("当前页：" + info.getPageNum());
            System.out.println("展示记录数：" + info.getPageSize());
            System.out.println("符合查询的总页数：" + info.getTotal());
            pageBean.setTotal((int)info.getTotal());
        }
        return books;
    }

    @Override
    public List<Book> queryByMinMax(BookDto bookDto) {
        return bookMapper.queryByMinMax(bookDto);
    }

}
package com.zlj.demo;


import com.zlj.biz.impl.BookBizImpl;
import com.zlj.dto.BookDto;
import com.zlj.mapper.BookMapper;
import com.zlj.model.Book;
import com.zlj.utils.PageBean;
import com.zlj.utils.SessionUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author zlj
 * @create 2023-08-21 9:07
 */

public class demo1 {
    private SqlSession sqlSession;
    private BookBizImpl bookBiz;

    @Before
    public void a(){
        System.out.println("执行测试方法之前会执行的初始化代码块");
        sqlSession= SessionUtil.openSession();
        BookBizImpl bookBiz=new BookBizImpl();
        BookMapper mapper=sqlSession.getMapper(BookMapper.class);
        bookBiz.setBookMapper(mapper);
        this.bookBiz=bookBiz;
    }
    @After
    public void b(){
        System.out.println("执行测试方法之后会执行");
        sqlSession.commit();
    }
    @Test
    public void test1(){
        System.out.println("测试方法。。。");
        Book book = bookBiz.selectByPrimaryKey(33);
        System.out.println(book);
    }
@Test
    public void test2(){
        bookBiz.deleteByPrimaryKey(34);
    }
@Test
public void testById(){
    List<Integer> bids = Arrays.asList(new Integer[]{56, 57, 58, 59, 60});
    bookBiz.selectByBids(bids).forEach(System.out::print);//jdk1.8新特性
//    for (Book selectByBid : bookBiz.selectByBids(bids)) {
//        System.out.println(selectByBid);
//    }
}
    @Test
    public void testlike1(){
        bookBiz.like1("%圣墟%").forEach(System.out::print);//jdk1.8新特性
    }
    @Test
    public void testlike2(){
        bookBiz.like2("%圣墟%").forEach(System.out::print);//jdk1.8新特性
    }
    @Test
    public void testlike3(){
        bookBiz.like3("%圣墟%").forEach(System.out::print);//jdk1.8新特性
    }

    @Test
    public void testlist01(){
        bookBiz.list01().forEach(System.out::print);//jdk1.8新特性
    }
    @Test
    public void testlist02(){
        bookBiz.list02().forEach(System.out::print);//jdk1.8新特性
    }


    @Test
    public void testlist03(){
        Map map=new HashMap();
        map.put("sid","01");
        map.put("cid","01");
        System.out.println(bookBiz.list03(map));
    }
    @Test
    public void testlist04(){
        Map map=new HashMap();
        map.put("sid","01");
        map.put("cid","01");
        bookBiz.list04(map).forEach(System.out::print);
    }
    @Test
    public void testbname1(){
        System.out.println(bookBiz.bname1(66));
    }
    @Test
    public void testbname2(){
        bookBiz.bname2("圣墟").forEach(System.out::print);
    }
    @Test
    public void selectByLikebname(){
        Map map=new HashMap();
        map.put("bname","%圣墟%");
        map.put("start",30);
        map.put("size",10);
        this.bookBiz.selectByLikebname(map).forEach(System.out::println);
    }
    @Test
    public void testlike04(){
        PageBean pageBean=new PageBean();
        pageBean.setPage(2);
        pageBean.setRows(20);
//        pageBean.setPagination(false);  //不分页
        bookBiz.like4("圣墟",pageBean).forEach(System.out::println);
    }
    @Test
    public void minmax(){
        BookDto dto=new BookDto();
        dto.setMin(41);
        dto.setMax(60);
        bookBiz.queryByMinMax(dto).forEach(System.out::println);
    }



}

 

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