使用Myeclipse创建一个Java project,Web project也行
然后新建一个文件夹lib
导入MyBatis的jar包,放到lib文件夹
(第一个是日志,第三个是源文件,第四个是数据库链接要用的)
然后选中这些jar包,右键
完成后会成为这样
编写实体类User.java
在src新建一个包,取包名字cn.bdqn.pojo
新建一个java类,名字为User.java
快捷键:Alt+Shift+s s
package cn.bdqn.pojo;
import java.util.Date;
public class User {
/*CREATE TABLE `smbms_user` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`userCode` varchar(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '用户编码',
`userName` varchar(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '用户名称',
`userPassword` varchar(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '用户密码',
`gender` int(10) DEFAULT NULL COMMENT '性别(1:女、 2:男)',
`birthday` date DEFAULT NULL COMMENT '出生日期',
`phone` varchar(15) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '手机',
`address` varchar(30) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT '地址',
`userRole` int(10) DEFAULT NULL COMMENT '用户角色(取自角色表-角色id)',
`createdBy` bigint(20) DEFAULT NULL COMMENT '创建者(userId)',
`creationDate` datetime DEFAULT NULL COMMENT '创建时间',
`modifyBy` bigint(20) DEFAULT NULL COMMENT '更新者(userId)',
`modifyDate` datetime DEFAULT NULL COMMENT '更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;*/
private long id;
private String userCode;
private String userName;
private String userPassword;
private Integer gender;
private Date birthday;
private String phone;
private String address;
private Integer userRole;
private String createdBy;
private Date creationDate;
private String modifyBy;
private Date modifyDate;
@Override
public String toString() {
return "User [id=" + id + ", userCode=" + userCode + ", userName=" + userName + ", userPassword="
+ userPassword + ", gender=" + gender + ", birthday=" + birthday + ", phone=" + phone + ", address="
+ address + ", userRole=" + userRole + ", createdBy=" + createdBy + ", creationDate=" + creationDate
+ ", modifyBy=" + modifyBy + ", modifyDate=" + modifyDate + "]";
}
public User() {
super();
}
public long getId() {
return id;
}
public void setId(long 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 String getCreatedBy() {
return createdBy;
}
public void setCreatedBy(String createdBy) {
this.createdBy = createdBy;
}
public Date getCreationDate() {
return creationDate;
}
public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}
public String getModifyBy() {
return modifyBy;
}
public void setModifyBy(String modifyBy) {
this.modifyBy = modifyBy;
}
public Date getModifyDate() {
return modifyDate;
}
public void setModifyDate(Date modifyDate) {
this.modifyDate = modifyDate;
}
}
在项目new一个Source Folder的文件夹,命名为resource,这个文件夹在程序编译的时候也会编译进去
然后在resource文件夹创建MyBatis配置文件mybatis-config.xml
方法一:点这里
然后在resource文件夹右键new的时候你可以看到
创建这个,名字为mybatis-config.xml
方法二:我按方法一还是没有看到
点击resource文件夹,右键,new,other
输入xml,你也可以看到
直接点击,输入名字,确定就行
怎么写这个文件???
百度MyBatis帮助文档
找到入门,往下拉
把这一段复制进去
然后在resource文件夹new两个File文件夹,名字分别是database.properties和log4j.properties
database.properties怎么写??
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/smbms?useUnicode=true&characterEncoding=utf-8
jdbc.user=root
jdbc.password=12345678
log4j.properties怎么写???
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
编写SQL映射文件UserMapper.xml
在src新建一个包,包名字为cn.bdqn.dao,新建一个file文件,名字为UserMapper.xml
代码可以从帮助文档找
我们根据需要,改为
<?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="cn/bdqn/dao/UserMapper">
<select id="selectBlog" resultType="int">
select count(1) from smbms_user
</select>
</mapper>
平时我们用的是*,不过1的速度更快,这里可以写很多select文件,但是id要不一样,而且注意返回类型是什么,在这里返回的记录数是int,还有namespace,你可以右键那个xml文件,copy qualified name,复制进去就行了,.xml和src前面都不要
回到mybatis-config.xml
修改为,修改完后,你可以全选-source-format,整理一下代码格式
<?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>
<!-- 引入属性文件 -->
<properties resource="database.properties"></properties>
<!-- 日志 -->
<settings>
<setting name="logImpl" value="LOG4J" />
</settings>
<!-- 运行环境 -->
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.user}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="cn/bdqn/dao/UserMapper.xml" />
</mappers>
</configuration>
要注意的是database.properties里面写的是jdbc.什么,所以上面那个代码框里面的value也是要加jdbc.
在src新建一个包cn.bdqn.test,创建一个java类,名字为Test
参考帮助文档
改写后
package cn.bdqn.test;
import java.io.IOException;
import java.io.InputStream;
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 org.apache.log4j.Logger;
public class Test {
private static Logger logger = Logger.getLogger("Test");
public static void main(String[] args) {
SqlSession session = null;
try {
// 读取核心配置文件mybatis-config.xml
String resource = "mybatis-config.xml";
InputStream inputStream;
inputStream = Resources.getResourceAsStream(resource);
// 创建SqlSessionFactory对象,读取配置文件
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
// 创建SqlSession对象
session = sqlSessionFactory.openSession();
// 调用mapper文件进行数据操作
int count = session.selectOne("cn/bdqn/dao/UserMapper.count");
logger.debug("用户数量是:" + count);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (session != null) {
session.close();
}
}
}
}