mybatis 操作数据库
目录结构
实体类：
package domain;
import java.util.Date;
public class AuthOrderExprieFlag {
private Integer id;
private Integer expireOrderNo;
private String verifyExpire;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getExpireOrderNo() {
return expireOrderNo;
}
public void setExpireOrderNo(Integer expireOrderNo) {
this.expireOrderNo = expireOrderNo;
}
public String getVerifyExpire() {
return verifyExpire;
}
public void setVerifyExpire(String verifyExpire) {
this.verifyExpire = verifyExpire == null ? null : verifyExpire.trim();
}
@Override
public String toString() {
return "AuthOrderExprieFlag{" +
"id=" + id +
", expireOrderNo=" + expireOrderNo +
", verifyExpire='" + verifyExpire + '\'' +
'}';
}
}
mapper:
package mapper;
import domain.AuthOrderExprieFlag;
/**
* Created by tom on 2017/12/12.
*/
public interface AuthOrderExprieFlagMapper {
public AuthOrderExprieFlag getAuthOrderExprieFlag(Integer i);
}
这里mapper.AuthOrderExprieFlagMapper 对应xml 文件的namespace
<?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">
<!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)
-->
<mapper namespace="mapper.AuthOrderExprieFlagMapper">
<resultMap id="BaseResultMap" type="domain.AuthOrderExprieFlag">
<id column="id" jdbcType="INTEGER" property="id" />
<result column="expire_order_no" jdbcType="INTEGER" property="expireOrderNo" />
<result column="verify_expire" jdbcType="VARCHAR" property="verifyExpire" />
</resultMap>
<!-- 在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是唯一的，不能够重复
使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型
resultType="me.gacl.domain.User"就表示将查询结果封装成一个User类的对象返回
User类就是users表所对应的实体类
-->
<!--
根据id查询得到一个user对象
-->
<select id="getAuthOrderExprieFlag" parameterType="int"
resultMap="BaseResultMap">
select * from tt_auth_order_expire_flag where id=#{id}
</select>
</mapper>
数据库的配置文件：
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<!-- 配置数据库连接信息 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://10.16.199.72:3306/cert"/>
<property name="username" value="certuser"/>
<property name="password" value="certuser"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mapping/AuthOrderExpireFlagMapping.xml"/>
</mappers>
</configuration>
最终查询的方法：
import domain.AuthOrderExprieFlag;
import mapper.AuthOrderExprieFlagMapper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.InputStream;
/**
* Created by tom on 2017/12/12.
*/
public class Test {
public static void main(String[] args) {
//mybatis的配置文件
String resource = "conf.xml";
//使用类加载器加载mybatis的配置文件（它也加载关联的映射文件）
InputStream is = Test.class.getClassLoader().getResourceAsStream(resource);
//构建sqlSession的工厂
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(is);
//使用MyBatis提供的Resources类加载mybatis的配置文件（它也加载关联的映射文件）
//Reader reader = Resources.getResourceAsReader(resource);
//构建sqlSession的工厂
//SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
//创建能执行映射文件中sql的sqlSession
SqlSession session = sessionFactory.openSession();
/**
* 映射sql的标识字符串，
* me.gacl.mapping.userMapper是userMapper.xml文件中mapper标签的namespace属性的值，
* getUser是select标签的id属性值，通过select标签的id属性值就可以找到要执行的SQL
*/
AuthOrderExprieFlagMapper authOrderExprieFlagMapper = session.getMapper(AuthOrderExprieFlagMapper.class);
//执行查询返回一个唯一user对象的sql
AuthOrderExprieFlag authOrderExprieFlag = authOrderExprieFlagMapper.getAuthOrderExprieFlag(296);
System.out.println(authOrderExprieFlag);
}
}
如果要在系统中添加日志logback.xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<!-- mapper 文件的包路径-->
<logger name="mapper.AuthOrderExprieFlagMapper" level="debug" />
<!--log4jdbc -->
<logger name="jdbc.sqltiming" level="debug"/>
<logger name="com.ibatis" level="debug" />
<logger name="com.ibatis.common.jdbc.SimpleDataSource" level="debug" />
<logger name="com.ibatis.common.jdbc.ScriptRunner" level="debug" />
<logger name="com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate"
level="debug" />
<logger name="java.sql.Connection" level="debug" />
<logger name="java.sql.Statement" level="debug" />
<logger name="java.sql.PreparedStatement" level="debug" />
<logger name="java.sql.ResultSet" level="debug" />
<root level="info">
<appender-ref ref="console" />
<appender-ref ref="cn.iautos.manager" />
<appender-ref ref="com.ibatis" />
<appender-ref ref="rollingFile" />
</root>
</configuration>
系统使用的pom 文件
<?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.mybatis</groupId>
<artifactId>Test</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
</dependencies>
</project>
