ResultSetExtractor With Aggregate Function : ResultSetExtractor « Spring « Java Tutorial

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Java Tutorial » Spring » ResultSetExtractor   28. 49. 1. ResultSetExtractor With Aggregate Function File: context.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xmlns:util="http://www.springframework.org/schema/util"        xmlns:tx="http://www.springframework.org/schema/tx"        xmlns:aop="http://www.springframework.org/schema/aop"        xmlns:lang="http://www.springframework.org/schema/lang"        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd                            http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd                            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd                            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd                            http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd"> <!--     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">         <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>         <property name="url" value="jdbc:oracle:thin:@oracle.devcake.co.uk:1521:INTL"/>         <property name="username" value="sa"/>         <property name="password" value=""/>     </bean> -->     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">     <property name="driverClassName" value="org.hsqldb.jdbcDriver"/>     <property name="url" value="jdbc:hsqldb:mem:."/>     <property name="username" value="sa"/>     <property name="password" value=""/>     </bean> <!--     <bean id="mysqlDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">         <property name="driverClassName" value="com.mysql.jdbc.Driver"/>         <property name="url" value="jdbc:mysql://dbhost-prospring-psql/prospring"/>         <property name="username" value="sa"/>         <property name="password" value=""/>     </bean> -->     <bean id="lobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler">         <property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"/>     </bean>     <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.CommonsDbcpNativeJdbcExtractor"/>     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">         <property name="dataSource" ref="dataSource"/>     </bean> </beans> File: Main.java import java.sql.ResultSet; import java.sql.SQLException; import javax.sql.DataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.dao.DataAccessException; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.ResultSetExtractor; class Main {   public static void main(String args[]) throws Exception {     ApplicationContext ac = new ClassPathXmlApplicationContext("context.xml", Main.class);     DataSource dataSource = (DataSource) ac.getBean("dataSource");     // DataSource mysqlDataSource = (DataSource) ac.getBean("mysqlDataSource");     JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);     Long count = (Long) jdbcTemplate.query("select count(*) from customer",         new ResultSetExtractor() {           public Object extractData(ResultSet resultSet) throws SQLException, DataAccessException {             if (resultSet.next()) {               return resultSet.getLong(1);             }             return null;           }         });     System.out.println(count);   } }   Download:  Spring-ResultSetExtractorWithAggregateFunction.zip( 3,655 k) 28. 49. ResultSetExtractor 28. 49. 1.  ResultSetExtractor With Aggregate Function 28. 49. 2.  PreparedStatement Creator And PreparedStatement Setter 28. 49. 3.  Implements ResultSetExtractor to read the data from first column