- mybatis的分页
- mybatis的特殊字符
1.mybatis的分页（selectByLikebname是加两个字段分页举例；like4是调用pageHelp分页举例）
为什么要重写mybatis的分页？
Mybatis的分页功能很弱，它是基于内存的分页(查出所有记录再按偏移量offset和边界limit取结果)，在大数据量的情况下这样的分页基本上是没有用的
使用分页插件步奏
- 导入pom依赖
- Mybatis.cfg.xml配置拦截器
- 使用PageHelper进行分页
- 处理分页结果
//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.mybatis的特殊字符（三种，示例：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);
}
}