1. 创建javaweb项目MyBaits_Page_CaChe
2.在项目的WebRoot下的WEB-INF下的lib文件下加入jar文件
log4j-1.2.17.jar
mybatis-3.2.3.jar
ojdbc14.jar
3.在src下创建jdbc.properties属性文件
1 driver=oracle.jdbc.driver.OracleDriver 2 url=jdbc\:oracle\:thin\:@127.0.0.1\:1521\:orcl 3 username=scott 4 password=tiger
jdbc.properties
4.在src下创建configuration.xml主配置文件
1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" >
3 <configuration>
4 <!-- 引用jdbc链接数据库属性文件 -->
5 <properties resource="jdbc.properties"/>
6
7 <!-- 全局参数的配置 -->
8 <settings>
9 <!-- 开启二级缓存 -->
10 <setting name="cacheEnabled" value="true"/>
11 </settings>
12
13
14 <!-- 配置别名 -->
15 <typeAliases>
16 <typeAlias type="com.entity.Emp" alias="Emp"/>
17 <typeAlias type="com.page.EmpPage" alias="EmpPage"/>
18 </typeAliases>
19
20 <environments default="development">
21 <environment id="development">
22 <transactionManager type="jdbc"/>
23 <dataSource type="POOLED">
24 <property name="driver" value="${driver}"/>
25 <property name="url" value="${url}"/>
26 <property name="username" value="${username}"/>
27 <property name="password" value="${password}"/>
28 </dataSource>
29
30
31
32 </environment>
33
34
35 </environments>
36
37 <mappers>
38 <mapper resource="com/mapper/EmpMapper.xml"/>
39 </mappers>
40
41 </configuration>
configuration.xml
5.在src下创建log4j.properties日志文件
1 log4j.rootLogger=DEBUG, Console 2 3 #Console 4 log4j.appender.Console=org.apache.log4j.ConsoleAppender 5 log4j.appender.Console.layout=org.apache.log4j.PatternLayout 6 log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n 7 8 log4j.logger.java.sql.ResultSet=INFO 9 log4j.logger.org.apache=INFO 10 log4j.logger.java.sql.Connection=DEBUG 11 log4j.logger.java.sql.Statement=DEBUG 12 log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.properties
6.在src下创建com.entity包下创建Emp.java
1 package com.entity;
2
3 public class Emp {
4 private int empno;
5 private String ename;
6 private double sal;
7 private int deptno;
8
9 public Emp() {
10 }
11 public Emp(int empno, String ename, double sal, int deptno) {
12 this.empno = empno;
13 this.ename = ename;
14 this.sal = sal;
15 this.deptno = deptno;
16 }
17 public int getEmpno() {
18 return empno;
19 }
20 public void setEmpno(int empno) {
21 this.empno = empno;
22 }
23 public String getEname() {
24 return ename;
25 }
26 public void setEname(String ename) {
27 this.ename = ename;
28 }
29 public double getSal() {
30 return sal;
31 }
32 public void setSal(double sal) {
33 this.sal = sal;
34 }
35 public int getDeptno() {
36 return deptno;
37 }
38 public void setDeptno(int deptno) {
39 this.deptno = deptno;
40 }
41 @Override
42 public String toString() {
43 return "Emp [deptno=" + deptno + ", empno=" + empno + ", ename="
44 + ename + ", sal=" + sal + "]";
45 }
46
47
48 }
Emp.java
7.在src下创建com.util包下创建MyBatisUtil.java
1 package com.util;
2
3 import java.io.IOException;
4 import java.io.Reader;
5
6 import org.apache.ibatis.io.Resources;
7 import org.apache.ibatis.session.SqlSession;
8 import org.apache.ibatis.session.SqlSessionFactory;
9 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
10
11 public class MyBatisUtil {
12 private static SqlSessionFactory sqlSessionFactory=null;
13 static{
14 try {
15 Reader reader=Resources.getResourceAsReader("configuration.xml");
16 sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
17 } catch (IOException e) {
18 e.printStackTrace();
19 }
20
21 }
22
23 public static SqlSession getSqlSession(boolean isCommit){
24 return sqlSessionFactory.openSession(isCommit);
25 }
26
27 }
MyBatisUtil.java
8.在src下创建com.page包下创建EmpPage.java
1 package com.page;
2
3 import java.util.List;
4
5 import org.apache.ibatis.session.SqlSession;
6
7 import com.entity.Emp;
8 import com.mapper.EmpMapper;
9 import com.util.MyBatisUtil;
10
11 public class EmpPage {
12 private Integer pageNo;
13 private Integer pageSize;
14 private Integer totalPage;
15 private Integer totalCount;
16
17
18 public EmpPage() {
19 }
20 public EmpPage(Integer pageNo, Integer pageSize) {
21 this.pageNo = pageNo;
22 this.pageSize = pageSize;
23 }
24 public Integer getPageNo() {
25 return pageNo;
26 }
27 public void setPageNo(Integer pageNo) {
28 if(pageNo!=null){
29 this.pageNo = pageNo;
30 }else{
31 this.pageNo=1;
32 }
33
34 }
35 public Integer getPageSize() {
36 return pageSize;
37 }
38 public void setPageSize(Integer pageSize) {
39 this.pageSize = pageSize;
40 }
41 public Integer getTotalPage() {
42 return totalPage;
43 }
44 public void setTotalPage(Integer totalPage) {
45 this.totalPage = totalPage;
46 }
47 public Integer getTotalCount() {
48 return totalCount;
49 }
50 public void setTotalCount(Integer totalCount) {
51 this.totalCount = totalCount;
52 }
53
54 /**
55 * 查询总记录数
56 * @return 总记录数
57 */
58 public int totalCount(){
59 SqlSession sqlSession=MyBatisUtil.getSqlSession(false);
60 EmpMapper mapper=sqlSession.getMapper(EmpMapper.class);
61 Integer count=mapper.totalCount();
62 sqlSession.clearCache();
63 sqlSession.close();
64
65 //修改
66
67 return count;
68 }
69
70 /**
71 * 计算总页数
72 * @param pageSize 页面大小
73 * @param totalCount 总的记录数
74 * @return 总页数
75 */
76 public int totalPage(int pageSize,int totalCount){
77 int count=totalCount%pageSize==0?totalCount/pageSize:totalCount/pageSize+1;
78 this.setTotalPage(count);
79 return count;
80 }
81
82 /**
83 * 分页查询
84 * @param pageSize 页面大小
85 * @param pageNo 当前页
86 * @return 分页查询集合
87 */
88 public List<Emp> findEmpPage(EmpPage page){
89 SqlSession sqlSession=MyBatisUtil.getSqlSession(false);
90 EmpMapper mapper=sqlSession.getMapper(EmpMapper.class);
91 List<Emp> list=mapper.findEmpPage(page);
92 sqlSession.close();
93 return list;
94 }
95
96
97 }
EmpPage.java
9.在src下创建com.mapper包下创建EmpMapper.java
1 package com.mapper;
2
3 import java.util.List;
4
5 import com.entity.Emp;
6 import com.page.EmpPage;
7
8 public interface EmpMapper {
9 /**
10 * 查询总条数
11 * @return
12 */
13 Integer totalCount();
14
15 /**
16 * 分页查询
17 */
18 List<Emp> findEmpPage(EmpPage page);
19
20 }
EmpMapper.java
10.在src下创建com.test包下创建EmpMapper.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
3 <mapper namespace="com.mapper.EmpMapper">
4 <!-- 开启二级缓存 -->
5 <!--回收策略为先进先出-->
6 <!--自动刷新时间60s-->
7 <!--最多缓存512个引用对象-->
8 <!--只读-->
9 <cache eviction="FIFO" flushInterval="60000" size="512" readOnly="true"/>
10
11 <!-- 查询总条数 -->
12 <select id="totalCount" resultType="Integer">
13 select count(*) from emp
14 </select>
15
16 <!-- 分页查询 -->
17 <select id="findEmpPage" resultType="Emp" parameterType="EmpPage">
18 <![CDATA[
19 select e.empno,e.ename,e.sal,e.deptno from
20 (
21 select rownum r,empno,ename,sal,deptno from emp
22 where rownum<=(#{pageNo}*#{pageSize})
23 )e where
24 e.r>(#{pageNo}-1)*#{pageSize}
25 ]]>
26
27 <!--
28 select e.empno,e.ename,e.sal,e.deptno from
29 (
30 select rownum r,empno,ename,sal,deptno from emp
31 where rownum<=3
32 )e where
33 e.r>0
34 -->
35
36 </select>
37
38 </mapper>
EmpMapper.xml
11.在src下创建com.mapper包下创建Test.java
1 package com.test;
2
3 import java.util.List;
4
5 import com.entity.Emp;
6 import com.page.EmpPage;
7
8 public class Test {
9
10 public static void main(String[] args) {
11 EmpPage page=new EmpPage(2, 3);
12 int count=page.totalCount();
13 count=page.totalCount();
14 System.out.println("------总条数："+count);
15 System.out.println("-----------分页查询数据如下---------");
16 List<Emp> list=page.findEmpPage(page);
17 for (Emp emp : list) {
18 System.out.println(emp);
19 }
20 }
21
22 }
Test.java
时间： 2024-10-22 13:23:48