使用spring框架的JdbcTemplate实现对Oracle数据库的简单操作实例

　　最近实现了一个小功能，针对Oracle数据库两张关联表进行查询和修改，因为比较简单，所以选择了spring框架里的JdbcTemplate。JdbcTemplate算是老古董了，是当年spring为了封装JDBC对数据库繁琐的操作而搞出来一个模板，相比起spring框架后来搞的JPA就显得比较low了。但技术只有合适的，没有最好的。这次因为时间紧，功能简单，使用JPA反而有点杀猪用牛刀了。直接上例子：

　　maven项目，当然先把依赖配置好了，spring框架的几个需要的jar包，这里只贴出来pom.xml里的依赖节点

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.3.12.RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.vividsolutions</groupId>
            <artifactId>jts</artifactId>
            <version>1.8</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc14</artifactId>
            <version>10.2.0.2.0</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz</artifactId>
            <version>2.3.0</version>
        </dependency>
    </dependencies>

　　JdbcTemplate在spring-jdbc这个包里，如果需要用到事务，那么再引入一个tx包，我这里比较简单，无须用事务。commons-dbcp和ojdbc14这两个包是用来连接oracle数据库用的。接下来看spring的配置文件

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <context:annotation-config />

    <bean id="PropertyConfig" class="com.inspur.chinanet.point.util.PropertiesConfigUtil">
        <property name="locations">
            <list>
                <value>classpath:global.properties</value>
            </list>
        </property>
        <property name="fileEncoding">
            <value>UTF-8</value>
        </property>
        <property name="ignoreResourceNotFound" value="true" />
        <property name="ignoreUnresolvablePlaceholders" value="true" />
    </bean>

    <bean id="jdbcImpl" class="com.inspur.chinanet.point.dao.JdbcImpl" />

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${driver.class}" />
        <property name="url" value="${driver.url}" />
        <property name="username" value="${db.username}" />
        <property name="password" value="${db.password}" />
    </bean>

    <!-- 使用MethodInvokingJobDetailFactoryBean，任务类可以不实现Job接口，通过targetMethod指定调用方法 -->
    <bean id="taskJob" class="com.inspur.chinanet.point.task.CirclePointTask" />
    <bean id="jobDetail"
        class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
        <property name="group" value="circle_point_group" />
        <property name="name" value="circle_point_update" />
        <!--false表示等上一个任务执行完后再开启新的任务 -->
        <property name="concurrent" value="false" />
        <property name="targetObject">
            <ref bean="taskJob" />
        </property>
        <property name="targetMethod">
            <value>run</value>
        </property>
    </bean>

    <!-- 调度触发器 -->
    <bean id="myTrigger"
        class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
        <property name="name" value="circle_point_update" />
        <property name="group" value="circle_point_group" />
        <property name="jobDetail">
            <ref bean="jobDetail" />
        </property>
        <property name="cronExpression">
            <value>0 11 13 ? * *</value>
        </property>
    </bean>

    <!-- 调度工厂 -->
    <bean id="scheduler"
        class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="triggers">
            <list>
                <ref bean="myTrigger" />
            </list>
        </property>
    </bean>
</beans>

　　这里先配置数据库的连接参数dataSource，然后把JdbcTemplate作为一个bean加载到spring容器中，然后我们就可以在DAO里执行数据库操作了。这里按spring提倡的面向接口编程，提供一个DAO的接口和实现类

package com.inspur.chinanet.point.dao;

import java.sql.Date;
import java.util.List;
import java.util.Map;

/**
 * 数据库增删查改接口
 *
 * @author wulinfeng
 * @version C10 2018年1月25日
 * @since SDP V300R003C10
 */
public interface JdbcInterface
{
    /**
     * 查询所有多边形
     *
     * @author wulinfeng
     * @return
     */
    public List<Map<String, Object>> queryCircles();

    /**
     * 根据日志查询点
     *
     * @author wulinfeng
     * @return
     */
    public List<Map<String, Object>> queryPoints(Date orderDate);

    /**
     * 查询每一个点
     *
     * @author wulinfeng
     * @return
     */
    public List<Map<String, Object>> querySinglePoint(Date orderDate, String openNumber);

    /**
     * 更新点所对应的多边形编码
     *
     * @author wulinfeng
     * @param circleId
     */
    public int updateCircleIdToPoint(Date orderDate, String openNumber, String longitude, String latitude,
        String gridId);

}

　　实现类

package com.inspur.chinanet.point.dao;

import java.sql.Date;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;

public class JdbcImpl implements JdbcInterface
{
    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 查询所有多边形
     *
     * @author wulinfeng
     * @return
     */
    public List<Map<String, Object>> queryCircles()
    {
        return jdbcTemplate.queryForList(
            "select OID, t.x LONGITUDE, t.y LATITUDE from I2_GRID_INFO_CUR,table (sdo_util.getvertices(LOCA_TION)) t");
    }

    /**
     * 根据日志查询点
     *
     * @author wulinfeng
     * @return
     */
    public List<Map<String, Object>> queryPoints(Date orderDate)
    {
        return jdbcTemplate.queryForList(
            "select OPEN_NUMBER from ORDER_2I_NEW where ORDER_DATE = ? and LONGITUDE != null and LATITUDE != null",
            orderDate);
    }

    /**
     * 查询每一个点
     *
     * @author wulinfeng
     * @return
     */
    public List<Map<String, Object>> querySinglePoint(Date orderDate, String openNumber)
    {
        return jdbcTemplate.queryForList(
            "select LONGITUDE,LATITUDE from ORDER_2I_NEW where ORDER_DATE = ? and OPEN_NUMBER = ?",
            new Object[] {orderDate, openNumber});
    }

    /**
     * 更新网格id
     *
     * @author wulinfeng
     * @return
     */
    public int updateCircleIdToPoint(Date orderDate, String openNumber, String longitude, String latitude,
        String gridId)
    {
        return jdbcTemplate.update(
            "update ORDER_2I_NEW set GRID_ID = ? where ORDER_DATE = ? and OPEN_NUMBER = ? and LONGITUDE = ? and LATITUDE = ?",
            new Object[] {gridId, orderDate, openNumber, longitude, latitude});
    }
}

　　我们在实现类里通过JdbcTemplate执行query和update。因为这里查到的数据有多条记录，所以使用了queryForList，然后再把查到的记录通过map的key，即记录的字段名，来获取字段值。具体来看下第一条查询的处理：

    /**
     * 查询多边形，封装数据到map
     *
     * @author wulinfeng
     * @param jdbcImpl
     * @return
     */
    public static Map<String, String> dealCircles(JdbcImpl jdbcImpl)
    {
        LOG.info("Start to deal with Table : [I2_GRID_INFO_CUR] *****");

        List<Map<String, Object>> circleDatas = jdbcImpl.queryCircles();

        if (circleDatas == null || circleDatas.size() == 0)
        {
            LOG.warning("Table: [I2_GRID_INFO_CUR] is empty.");
            return null;
        }

        Map<String, String> circleMap = null;
        circleMap = new HashMap<>();

        String oId = null;
        String longitude_circle = null;
        String latitude_circle = null;

        // 先遍历数据库查询的多边形列表,按oId为key，value拼接经纬度成类似："39.8160521200 116.6385841370"
        for (Map<String, Object> circleItem : circleDatas)
        {
            oId = circleItem.get("OID").toString();
            longitude_circle = circleItem.get("LONGITUDE").toString();
            latitude_circle = circleItem.get("LATITUDE").toString();

            // 数据校验
            if (StringUtils.isEmpty(oId))
            {
                LOG.warning("Field OID in Table [I2_GRID_INFO_CUR] is null.");
                continue;
            }

            if (StringUtils.isEmpty(longitude_circle) || StringUtils.isEmpty(latitude_circle))
            {
                LOG.warning("Field LOCA_TION in Table [I2_GRID_INFO_CUR] has problem query by OID : " + oId);
                continue;
            }

            // 合并相同oId经纬度
            if (!circleMap.containsKey(oId))
            {
                circleMap.put(oId, latitude_circle + " " + longitude_circle);
            }
            else
            {
                circleMap.put(oId, circleMap.get(oId) + "," + latitude_circle + " " + longitude_circle);
            }
        }

        // 再遍历一次合并后的map，拼接成POLYGON ((39.8160521200 116.6385841370,39.8078766971 116.6742897034))"
        Iterator<String> it = circleMap.keySet().iterator();
        while (it.hasNext())
        {
            String key = it.next();
            circleMap.put(key, "POLYGON ((" + circleMap.get(key) + "))");
        }

        LOG.info("Table: [I2_GRID_INFO_CUR] has " + circleMap.size() + " records.");

        return circleMap;
    }

　　我们看到这里查出I2_GRID_INFO_CUR表里所有记录，然后遍历记录list，通过map取出每条记录的3个字段值：OID、LONGITUDE和LATITUDE。最后我们回到spring配置文件，看下数据库连接的配置dataSource，这里是从global.properties里取到的配置参数：

driver.class=oracle.jdbc.driver.OracleDriver
driver.url=jdbc:oracle:thin:@192.168.12.3:1521:nwom
db.username=wlf
db.password=wlf