mybatis框架-查询用户表中的记录数

之前已经搭建过mybatis框架了，现在我们要用mybatis框架真正的干点事情了。

这是这个简单web项目的整体架构。

 

 我们使用mybatis框架查询用户表中的记录数；

这是用户类：

package cn.smbms.dao.pojo.user;

import java.util.Date;

public class User {
    private Integer id; //id 
    private String userCode; //鐢ㄦ埛缂栫爜
    private String userName; //鐢ㄦ埛鍚嶇О
    private String userPassword; //鐢ㄦ埛瀵嗙爜
    private Integer gender;  //鎬у埆
    private Date birthday;  //鍑虹敓鏃ユ湡
    private String phone;   //鐢佃瘽
    private String address; //鍦板潃
    private Integer userRole;    //鐢ㄦ埛瑙掕壊
    private Integer createdBy;   //鍒涘缓鑰?
    private Date creationDate; //鍒涘缓鏃堕棿
    private Integer modifyBy;     //鏇存柊鑰?
    private Date modifyDate;   //鏇存柊鏃堕棿
    
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUserCode() {
        return userCode;
    }
    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getUserPassword() {
        return userPassword;
    }
    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }
    public Integer getGender() {
        return gender;
    }
    public void setGender(Integer gender) {
        this.gender = gender;
    }
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public Integer getUserRole() {
        return userRole;
    }
    public void setUserRole(Integer userRole) {
        this.userRole = userRole;
    }
    public Integer getCreatedBy() {
        return createdBy;
    }
    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }
    public Date getCreationDate() {
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }
    public Integer getModifyBy() {
        return modifyBy;
    }
    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }
    public Date getModifyDate() {
        return modifyDate;
    }
    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }
}

这是sql映射文件：

<?xml version="1.0" encoding="UTF-8"?>
<!-- 引入mybatis框架SQL文件的头部 -->
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.smbms.dao.user.UerMapper">
    <!-- 编写自己的sql语句 -->
    <select id="count" resultType="int">
        select count(1) from smbms_user;
    </select>
</mapper>

这是数据库配置文件：

1 driver=com.mysql.jdbc.Driver
2 url=jdbc:mysql://127.0.0.1:3306/smbms?useUnicode=true&characterEncoding=utf-8
3 user=root
4 password=root

这是log4j组件

log4j.rootLogger=DEBUG,CONSOLE,file
#log4j.rootLogger=ERROR,ROLLING_FILE
log4j.logger.cn.smbms.dao=debug
log4j.logger.com.ibatis=debug 
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug 
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug 
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug 
log4j.logger.java.sql.Connection=debug 
log4j.logger.java.sql.Statement=debug 
log4j.logger.java.sql.PreparedStatement=debug 
log4j.logger.java.sql.ResultSet=debug 
log4j.logger.org.tuckey.web.filters.urlrewrite.UrlRewriteFilter=debug

######################################################################################
# Console Appender  \u65e5\u5fd7\u5728\u63a7\u5236\u8f93\u51fa\u914d\u7f6e
######################################################################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=error
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern= [%p] %d %c - %m%n


######################################################################################
# DailyRolling File  \u6bcf\u5929\u4ea7\u751f\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\u683c\u5f0f:log2009-09-11
######################################################################################
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern=yyyy-MM-dd
log4j.appender.file.File=log.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=error
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L) %m%n


log4j.logger.com.opensymphony.xwork2=error  

这是mybatis框架的核心配置文件：

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration
 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 
 6 <configuration>
 7     <!-- 引入database.properties 文件 -->
 8     <properties resource="database.properties"/><!--注意这个是有闭合标签的  -->
 9         <!-- 配置日志的实现方式是log4j实现 -->
10         <settings>
11             <setting name="logImpl" value="LOG4J"/>
12         </settings>
13         <!-- 配置mybatis的运行环境，可以有多套运行环境 默认先指定成为开发环境 和下面的id属性的命名是相对应的 -->
14         <environments default="development">
15             <environment id="development">
16                 <!--配置事务管理，采用jdbc的事务管理 -->
17                 <transactionManager type="JDBC"></transactionManager>
18                 <!-- POOLED:mybatis自带的数据源，JNDI:基于tomcat的数据源 -->
19                 <dataSource type="POOLED">
20                     <property name="driver" value="${driver}" />
21                     <property name="url" value="${url}" />
22                     <property name="username" value="${user}" />
23                     <property name="password" value="${password}" />
24                 </dataSource>
25             </environment>
26         </environments>
27     
28     <!-- 下面是重头戏 mybatis的sql文件 将mapper文件引入到mybatis的配置文件中-->
29     <mappers>
30     <mapper resource="cn/smbms/dao/user/UserMapper.xml"/>
31     </mappers>
32 </configuration>

创建UserMapperTest.java

 1 package cn.smbms.dao.test;
 2 import org.apache.ibatis.session.SqlSession;
 3 import org.apache.ibatis.session.SqlSessionFactory;
 4 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 5 import org.apache.log4j.Logger;
 6 import org.junit.Before;
 7 import org.junit.Test;
 8 import java.io.InputStream;
 9 import java.util.Properties;
10 import org.apache.ibatis.io.Resources;
11 
12 
13 
14 public class UserMapperTest {
15     //引入日志组件
16     private Logger mlogger=Logger.getLogger(UserMapperTest.class);
17     @Before
18     public void setUp(){
19         
20     }
21     @Test
22     public void test(){
23         String resource="mybatis-config.xml";
24         int count=0;
25         SqlSession sqlSession=null;
26     
27         try {
28             //读取mybatis框架的核心配置文件 mybatis-config.xml  现将文件转化流的形式
29             InputStream inputStream = Resources.getResourceAsStream(resource);
30             //创建SqlSessionFactoryBuilder读取框架的配置文件
31             SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
32             //创建sqlsession
33             sqlSession= factory.openSession();
34             //调用mapper文件来对数据库进行操作，必须先把mapper文件引入到mybatis-config.xml中
35             count = (Integer)sqlSession.selectOne("cn.smbms.dao.user.UerMapper.count");
36             mlogger.info("用户表中的记录数："+count);
37             
38             
39             
40         } catch (Exception e) {
41             // TODO: handle exception
42         }finally{
43             //最后一定要注意：关闭会话
44             if(sqlSession!=null){
45                 sqlSession.close();
46             }
47             
48         }
49         
50         
51         
52     }
53 
54 }