查询数据库表中某一个日期的所有数据,通过传入日期参数来查询。数据库表结构如下:
mybatis配置
在web.xml中引用spring-mybatis.xml配置
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:conf/spring-mybatis.xml</param-value> </context-param>
在spring-mybatis.xml中引入数据库操作mapping文件和mybaits配置文件
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="typeAliasesPackage" value="com.risk.model"/> <property name="mapperLocations" value="classpath*:mybatis/*.xml"/> <property name="configLocation" value="classpath:conf/mybatis-config.xml" /> </bean>
在mybatis-config.xml中设置log4j2的配置
<?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> <settings> <setting name="logImpl" value="LOG4J2"/> </settings> </configuration>
查询日期xml和代码
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.risk.dao.HighLimitDao"> <resultMap type="com.risk.entity.HighLimitEntity" id="hResultMap" > <id property="index" column="index"/> <result property="date" jdbcType="DATE" column="date" javaType="java.util.Date" /> <result property="open" column="open"/> <result property="high" column="high"/> <result property="low" column="low"/> <result property="volume" column="volume"/> </resultMap> <select id="query" parameterType="java.util.HashMap" resultMap="hResultMap"> select * from limit where 1=1 <if test="date != null"> AND date=#{date} </if> </select> </mapper>
对应的java实现类
public class HighLimitEntity { private Long index; private Date date; private String code; private Double open; private Double close; private Double high; private Double low; } @Repository public class HighLimitDaoImpl implements HighLimitDao { @Autowired private SqlSessionFactory sqlSessionFactory; public List<HighLimitEntity> query(Map<String, Object> params){ SqlSession sqlSession = sqlSessionFactory.openSession(); List<HighLimitEntity> entities = sqlSession.selectList("com.risk.dao.HighLimitDao.query", params); sqlSession.close(); return entities; } }
Map<String, Object> params = new HashMap<String, Object>();
Date date = new Date();
Date target = null;
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
try {
String dateString = dateFormat.format(date);
System.out.println("date:" + dateString);
target = dateFormat.parse(dateString);
System.out.println("date:" + target);
params.put("date", target);
}catch (Exception e){
e.printStackTrace();
return null;
}
highLimitDao.query(params)
log4j2.xml
如果想增加调试日志,看Mybatis中有什么错误,可以在log4j2中定义sql查询的日志,打印出查询过程。log4j2.xml中定义了dao的路径,level是debug,这样就可以打印出查询语句到日志中
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<?xml version="1.0" encoding="UTF-8"?> <configuration status="OFF"> <appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/> </Console> <File name="File" fileName="../logs/test.log" append="true"> <PatternLayout pattern="%d{HH:mm:ss.SSS} %-5level %class{36} %L %M - %msg%xEx%n"/> </File> </appenders> <loggers> <logger name="com.risk.test" level="info" additivity="false"> <appender-ref ref="Console"/> </logger> <logger name="log4j.logger.java.sql.Statement" level="info" additivity="false"> <appender-ref ref="File"/> </logger> <Logger name="com.risk.dao" level="debug" additivity="false"> <AppenderRef ref="File"/> </Logger> <root level="info"> <appender-ref ref="Console"/> <appender-ref ref="File"/> </root> </loggers> </configuration>