mybaits（查询与别名、日志框架显示sql语句、对象属性和数据库表字段不匹配resultMap使用、mysql数据查询分页、执行sql和存储过程、动态SQL语句）
2018-10-04 14:30
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版权声明：转载请指明出处 https://blog.csdn.net/weixin_42321963/article/details/82937281
主要是各种配置文件，建议把整个项目搬到自己电脑上慢慢看。
创建maven项目
首先是各种配置文件：
pom.xml:
[code]<?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.zit</groupId>
<artifactId>mybatis04</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>mybatis04</name>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<testSourceDirectory>src/test/java</testSourceDirectory>
<sourceDirectory>src/main/java</sourceDirectory>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
</resources>
</build>
</project>
src/main/resources目录下的内容：
resources/conf.xml:
[code]<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--加载db.peoperties-->
<properties resource="db.properties"/>
<settings>
<setting name="logPrefix" value="dao."/>
</settings>
<typeAliases>
<!-- <typeAlias type="com.zit.entity.Book" alias="bk"/>-->
<package name="com.zit.entity"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${db.driver}"/>
<property name="url" value="${db.url}"/>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<package name="com.zit.mapper"/>
</mappers>
</configuration>
resources/db.properties
[code]db.driver=com.mysql.cj.jdbc.Driver db.url=jdbc:mysql://localhost:3306/dt_game?serverTimezone=PRC&useSSL=false&useUnicode=true&characterEncoding=utf8 db.username=root db.password=
resources/logback.xml:
[code]<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>DEBUG</level>
</filter>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} [%t] %p %c [LineNumber:%L]: %m%n
</pattern>
</encoder>
</appender>
<appender name="debugLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>c:/demo.log</file>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>DEBUG</level>
</filter>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} [%t] %p %c [行号:%L]: %m%n</pattern>
</encoder>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/file/path/example/file-name.debug.log.%d{yyyy-MM-dd}
</fileNamePattern>
</rollingPolicy>
</appender>
<appender name="errorLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>/file/path/example/file-name.error.log</file>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>DEBUG</level>
</filter>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} [%t] %p %c [LineNumber:%L]: %m%n
</pattern>
</encoder>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/file/path/example/file-name.error.log.%d{yyyy-MM-dd}
</fileNamePattern>
</rollingPolicy>
</appender>
<root level="info">
<appender-ref ref="console"/>
<appender-ref ref="debugLog"/>
<appender-ref ref="errorLog"/>
</root>
<logger level="debugLog" name="com.Demo"/>
<logger level="debug" name="dao"/>
<logger level="debug" name="com.zit.servlet.Show"/>
<logger name="org.springframework.jdbc.core.JdbcTemplate" level="ERROR"/>
</configuration>
src/main/webapp/WEB-INF/web.xml文件如下：
[code]<?xml version="1.0" encoding="utf-8" ?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <display-name>mybatis04</display-name> <!--配置web项目的web.xml文件的首页--> <welcome-file-list> <welcome-file>/show</welcome-file> <welcome-file>index.html</welcome-file> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
src/java/com/zit目录下：
com.zit.dao.BookDao.java 和MybatisHelper.java
[code]package com.zit.dao;
import com.zit.entity.Book;
import com.zit.mapper.BookMapper;
import org.apache.ibatis.session.SqlSession;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
public class BookDAO implements BookMapper {
private SqlSession session;
private BookMapper bm;
public BookDAO() {
this.session = new MybatisHelper().getSqlSession();
this.bm = session.getMapper(BookMapper.class);
}
public List<Book> query() {
return bm.query();
}
public int save(Book book) {
int i = bm.save(book);
session.commit();
return i;
}
public int deleteById(int id) {
int i = bm.deleteById(id);
session.commit();
return i;
}
public int updateById(Book book) {
int i = bm.updateById(book);
session.commit();
return i;
}
public int count() {
int i = bm.count();
return i;
}
public List<String> queryNames() {
return bm.queryNames();
}
public List<Map<String, Object>> queryNameAndPrice() {
return bm.queryNameAndPrice();
}
public List<Map<String, Object>> queryrandom(Map<String, Object> map) {
return bm.queryrandom(map);
}
public List<Map<String, Object>> queryok(String name, BigDecimal price) {
return bm.queryok(name, price);
}
public Book queryById(int id) {
return bm.queryById(id);
}
}
*********************************************************************************
package com.zit.dao;
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 java.io.IOException;
import java.io.InputStream;
public class MybatisHelper {
protected SqlSessionFactory sf;
protected SqlSession session;
public MybatisHelper() {
InputStream is = null;
try {
is = Resources.getResourceAsStream("conf.xml");
} catch (IOException e) {
e.printStackTrace();
}
sf = new SqlSessionFactoryBuilder().build(is);
session = sf.openSession();
}
public SqlSession getSqlSession() {
return session;
}
public SqlSessionFactory getFactory() {
return sf;
}
}
com.zit.entity包下的java Book.java Classes.java MyStu.java Student.java Teacher.java
[code]package com.zit.entity;
import lombok.Data;
@Data
public class Teacher {
private int tid;
private String tname;
private Classes classes;
}
*********************************************************************
package com.zit.entity;
import lombok.Data;
import java.math.BigDecimal;
import java.util.Date;
@Data
public class Book {
private int id;
private String name;
private BigDecimal price;
private Date btime;
}
***********************************************************************
package com.zit.entity;
import lombok.Data;
@Data
public class Classes {
private int cid;
private String cname;
private Teacher teacher;
}
*********************************************************************
package com.zit.entity;
import lombok.Data;
@Data
public class MyStu {
private int id;
private String sname;
private int sscore;
private String sdept;
}
********************************************************************
package com.zit.entity;
import lombok.Data;
@Data
public class Student {
private int id;
private String name;
private String gender;
private int score;
private String dept;
}
com.zit.mapper包下的内容：
接口：BookMapper.java MyStuMapper.java StudentMapper.java
映射文件BookMapper.xml MyStuMapper.xml StudentMapper.xml
[code]package com.zit.mapper;
import com.zit.entity.Book;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
public interface BookMapper {
@Select("select * from book")
public List<Book> query();
/* @Select("select * from book where id=#{id}")*/
public Book queryById(int id);
@Insert("insert into book values(null,#{name},#{price},#{btime})")
public int save(Book book);
public int deleteById(int id);
public int updateById(Book book);
@Select("select count(*) from book")
public int count();
@Select("select name from book")
public List<String> queryNames();
@Select("select name,price from book")
public List<Map<String, Object>> queryNameAndPrice();
@Select("select name,price from book where name like #{name} and price>#{price}")
public List<Map<String, Object>> queryrandom(Map<String, Object> map);
//增加注解
@Select("select name,price from book where name like #{nn} and price>#{pp}")
public List<Map<String, Object>> queryok(@Param("nn") String name, @Param("pp") BigDecimal price);
}
BookMapper.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.zit.mapper.BookMapper">
<delete id="deleteById">
delete from book where id=#{id}
</delete>
<select id="queryById" resultType="book" parameterType="int">
select * from book where id=#{id}
</select>
<update id="updateById">
update book set name=#{name},price=#{price},btime=#{btime} where id=#{id}
</update>
</mapper>
*********************************************************************************
package com.zit.mapper;
import com.zit.entity.MyStu;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.mapping.StatementType;
import org.apache.ibatis.session.RowBounds;
import java.util.List;
public interface MyStuMapper {
@Select("select id,name,score,dept from stuu")
@ResultMap("ms")
public List<MyStu> query();
@Select("select count(*) from stu")
public int getCount();
@Select("select id,name,score,dept from stu limit #{start},#{pagesize}")
@ResultMap("ms")
public List<MyStu> page(@Param("start") int start, @Param("pagesize") int pagesize);
@Select("select * from stu")
@ResultMap("ms")
public List<MyStu> pages(RowBounds rows);
@Select("call stushow")
@ResultMap("ms")
@Options(statementType = StatementType.CALLABLE)
public List<MyStu> pp();
public List<MyStu> pppp();
}
MyStuMapper.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.zit.mapper.MyStuMapper">
<resultMap id="ms" type="MyStu">
<id column="id" property="id"/>
<id column="name" property="sname"/>
<id column="score" property="sscore"/>
<id column="dept" property="sdept"/>
</resultMap>
<select id="abc" resultMap="ms" statementType="PREPARED">
select id,name,score,dept from stuu
</select>
<!--string List<String> map List<Map<String,Object>>-->
<select id="showdbs" resultType="java.lang.String">
/*show databases*/
<include refid="dbs"/>
</select>
<sql id="tbs">show tables</sql>
<sql id="dbs">show databases</sql>
<select id="pppp" resultMap="ms" statementType="CALLABLE">
call stushow
</select>
</mapper>
**********************************************************************************
package com.zit.mapper;
import com.zit.entity.Student;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import java.util.List;
import java.util.Map;
public interface StudentMapper {
//public List<Student> query();
//public List<Student> query(@Param("name") String name);
public List<Student> query(Map<String, Object> map);
// public int update(Student student);
public int update(Map<String, Object> map);
@Select("select * from student where id=#{id}")
public Student queryById(int id);
}
StudentMapper.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.zit.mapper.StudentMapper">
<select id="query" resultType="student" parameterType="map">
select id,name,gender,score,dept from student
<where>
<if test="name!=null">
<if test='name.contains("%")'>
and name like #{name}
</if>
<if test='!name.contains("%")'>
and name = #{name}
</if>
</if>
<if test="id!=null">
and id=#{id}
</if>
</where>
</select>
<!-- set name=#{name},gender=#{gender},dept=#{dept},score=#{score} where id=#{id}-->
<update id="update" parameterType="student">
update student
<!-- <set>-->
<trim prefix="SET" suffixOverrides=",">
<if test="name!=null">
name=#{name},
</if>
<if test="dept!=null">
dept=#{dept},
</if>
<if test="score!=null">
score=#{score},
</if>
<if test="gender!=null">
gender=#{gender},
</if>
</trim>
<!-- </set>-->
where id=#{id}
</update>
</mapper>
*******************************************************************************
com.zit.servlet包：
show.java Update.java
[code]package com.zit.servlet;
import com.zit.dao.BookDAO;
import com.zit.entity.Book;
import lombok.extern.slf4j.Slf4j;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
@WebServlet("/show")
@Slf4j
public class Show extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
if (req.getParameter("name") != null) {
BookDAO bd = new BookDAO();
Book b = new Book();
b.setName(req.getParameter("name"));
b.setPrice(new BigDecimal(req.getParameter("price")));
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
d = sdf.parse(req.getParameter("btime"));
} catch (ParseException e) {
e.printStackTrace();
}
b.setBtime(d);
bd.save(b);
resp.sendRedirect("/show");
} else if (req.getParameter("did") != null) {
BookDAO bd = new BookDAO();
bd.deleteById(Integer.parseInt(req.getParameter("did")));
resp.sendRedirect("/show");
} else if (req.getParameter("uid") != null) {
BookDAO bd = new BookDAO();
req.setAttribute("book", bd.queryById(Integer.parseInt(req.getParameter("uid"))));
req.getRequestDispatcher("/update.jsp").forward(req, resp);
}/* else if (req.getParameter("upid") != null) {
BookDAO bd = new BookDAO();
Book book = new Book();
book.setId(Integer.parseInt(req.getParameter("upid")));
System.out.println(book.getId());
book.setName(req.getParameter("name"));
book.setPrice(new BigDecimal(req.getParameter("price")));
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
d = sdf.parse(req.getParameter("btime"));
} catch (ParseException e) {
e.printStackTrace();
}
book.setBtime(d);
System.out.println(book);
//bd.updateById(book);
resp.sendRedirect("/show");
} */ else {
log.debug("book");
BookDAO bd = new BookDAO();
req.setAttribute("book", bd.query());
req.getRequestDispatcher("show.jsp").forward(req, resp);
}
}
}
*******************************************************************
package com.zit.servlet;
import com.zit.dao.BookDAO;
import com.zit.entity.Book;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
@WebServlet("/update")
public class Update extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
BookDAO bd = new BookDAO();
Book book = new Book();
book.setId(Integer.parseInt(req.getParameter("upid")));
book.setName(req.getParameter("name"));
book.setPrice(new BigDecimal(req.getParameter("price")));
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
d = sdf.parse(req.getParameter("btime"));
} catch (ParseException e) {
e.printStackTrace();
}
book.setBtime(d);
bd.updateById(book);
resp.sendRedirect("/show");
}
}
src/main/java包下的东西完成。。
src/main/webapp包下的内容：
webapp/WEB-INF/web.xml文件上面已经写过了
web/app其他内容：index.jsp show.jsp update.jsp
[code]index.jsp
<%@ page import="com.zit.dao.BookDAO" %>
<%@ page import="com.zit.entity.Book" %>
<%@ page import="java.util.List" %>
<%@ page language="java" pageEncoding="utf-8" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<mata charset="utf-8"/>
<title>显示书籍信息</title>
<meta http-equiv="refresh" content="0;url=/show">
</head>
<body>
</body>
</html>
**************************************************************************
show.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ page language="java" pageEncoding="utf-8" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<mata charset="utf-8"/>
<title>显示书籍信息</title>
</head>
<body>
<c:forEach items="${book}" var="bk">
id:${bk.id}----------${bk.name}-----价格：${bk.price}--------出版日期：<fmt:formatDate value="${bk.btime}"
pattern="yyyy年MM月dd日"/>
----<a href="/show?did=${bk.id}">删除</a>
<a href="/show?uid=${bk.id}">编辑</a>
<br>
</c:forEach>
<br>
<form action="/show" method="post">
书籍名称：<input type="text" name="name"><br>
书籍价格：<input type="text" name="price"><br>
出版日期：<input type="text" name="btime"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
*******************************************************************************
update.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ page language="java" pageEncoding="utf-8" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<mata charset="utf-8"/>
<title>修改书籍信息</title>
</head>
<body>
<h3>修改书籍信息</h3>
<form action="/update?upid=${book.id}" method="post">
书籍名称：<input type="text" name="name" value="${book.name}"><br>
书籍价格：<input type="text" name="price" value="${book.price}"><br>
出版日期：<input type="text" name="btime" value="<fmt:formatDate value="${book.btime}" pattern="yyyy-MM-dd"/> "><br>
<input type="submit" value="提交更改">
</form>
<a href="/show">查看书籍信息</a>
</body>
</html>
完成。。。
src/test/java/com/Demo.java测试文件如下：
[code]package com;
import com.zit.dao.BookDAO;
import com.zit.dao.MybatisHelper;
import com.zit.entity.MyStu;
import com.zit.entity.Student;
import com.zit.mapper.BookMapper;
import com.zit.mapper.MyStuMapper;
import com.zit.mapper.StudentMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.RowBounds;
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.Reader;
import java.math.BigDecimal;
import java.sql.Connection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Demo {
@Test
public void msql() {
SqlSession ss = new MybatisHelper().getSqlSession();
StudentMapper sdao = ss.getMapper(StudentMapper.class);
Map<String, Object> map = new HashMap<String, Object>();
map.put("id", 2);
map.put("name", "周强");
map.put("dept", "计算机网络");
sdao.update(map);
ss.commit();
/* Student stu=sdao.queryById(2);
stu.setName("张三丰");
stu.setScore(80);
stu.setDept("武术");
sdao.update(stu);*/
/* ss.commit();*/
//System.out.println(sdao.query(null));
/* Map<String,Object> map=new HashMap<String, Object>();
map.put("name","李七七");
map.clear();*/
// System.out.println(sdao.query(map));
/* System.out.println(sdao.query(map));
// System.out.println(sdao.query(4));
map.clear();
System.out.println(sdao.query(map));
map.put("id",5);
System.out.println(sdao.query(map));
map.put("name","___");*/
}
@Test
public void sql() {
SqlSession ss = new MybatisHelper().getSqlSession();
MyStuMapper mdao = ss.getMapper(MyStuMapper.class);
//System.out.println(mdao.pp());
System.out.println(mdao.pppp());
//System.out.println(ss.selectList("showdbs"));
/* SqlSession aa = new MybatisHelper().getSqlSession();
System.out.println(ss==aa);
Connection c1=ss.getConnection();
Connection c2=aa.getConnection();
System.out.println(c1==c2);*/
/* MyStuMapper sdao = s.getMapper(MyStuMapper.class);
System.out.println(s.selectList("showdbs"));*/
// Connection conn=s.getConnection();
}
@Test
public void ppp() {
SqlSession s = new MybatisHelper().getSqlSession();
MyStuMapper sdao = s.getMapper(MyStuMapper.class);
RowBounds rows = new RowBounds(3, 3);
List<MyStu> list = sdao.pages(rows);
System.out.println(list.size());
System.out.println(list);
}
@Test
public void abcdd() {
SqlSession s = new MybatisHelper().getSqlSession();
MyStuMapper sdao = s.getMapper(MyStuMapper.class);
int pagesize = 3;
int currpage = 2;
int recordcount = sdao.getCount();
System.out.println(recordcount);
List<MyStu> li = sdao.page(currpage * pagesize - pagesize, pagesize);
System.out.println(li.size());
System.out.println(li);
/*System.out.println(sdao.query());
System.out.println(sdao.query().size());*/
//System.out.println(s.selectList("abc"));
//System.out.println(s.selectList("com.zit.mapper.MyStuMapper.abc"));
}
@Test
public void nnn() {
BookDAO bdao = new BookDAO();
System.out.println(bdao.queryById(10));
}
@Test
public void del() {
BookDAO bdao = new BookDAO();
//System.out.println(bdao.count());
//System.out.println(bdao.queryNames());
//List<Map<String,Object>>list=bdao.queryNameAndPrice();
/* Map<String,Object>map=new HashMap<String, Object>();
map.put("name","%java%");
map.put("price",new BigDecimal(150));*/
//List<Map<String,Object>>list=bdao.queryrandom(map);
List<Map<String, Object>> list = bdao.queryok("%java%", new BigDecimal(50));
for (Map m : list) {
System.out.println(m.get("name") + "-------" + m.get("price"));
}
}
@Test
public void abc() {
try {
Reader reader = Resources.getResourceAsReader("conf.xml");
SqlSessionFactory sf = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = sf.openSession();
BookMapper bookdao = session.getMapper(BookMapper.class);
//System.out.println(bookdao.query());
System.out.println(bookdao.queryById(19));
} catch (IOException e) {
e.printStackTrace();
}
}
}
全部完成。。。。。。。。。。。。。。。。。。。。。。。。。
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