• Spring(三)使用JdbcTemplate对象完成查询


    查询银行账户的数量
    1.建立一个项目导入jar包(ioc aop dao 连接池 数据库驱动 ),拷贝容器对应的配置文件到src下
    2.在配置文件中开启组件扫描
    3.写一个DAO接口定义一个查询方法
    4.定义一个JdbcTemplate的成员变量
    4.1在类上加@Repository标注
    4.2注入JdbcTemplate,JdbcTemplate创建时要使用到dataSource
    4.3使用模板完成查询

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <beans xmlns="http://www.springframework.org/schema/beans"
     3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     4     xmlns:context="http://www.springframework.org/schema/context"
     5     xmlns:lang="http://www.springframework.org/schema/lang"
     6     xmlns:mvc="http://www.springframework.org/schema/mvc"
     7     xmlns:util="http://www.springframework.org/schema/util"
     8     xmlns:task="http://www.springframework.org/schema/task"
     9     xmlns:aop="http://www.springframework.org/schema/aop"
    10     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
    11         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd
    12         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    13         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
    14         http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.1.xsd
    15         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
    16         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd">
    17     <!-- 开启组件扫描 -->
    18     <context:component-scan base-package="com.xcz"></context:component-scan>
    19     <!-- 开启标注形式的mvc -->
    20     <mvc:annotation-driven></mvc:annotation-driven>
    21     <!-- 配置视图处理器 -->
    22     <bean id="ViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    23         <property name="prefix" value="/WEB-INF/"></property>
    24         <property name="suffix" value=".jsp"></property>
    25     </bean>
    26     <!-- 引入外部资源 -->
    27     <context:property-placeholder location="classpath:db.properties"/>
    28     <!-- 配置数据源 -->
    29     <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    30         <property name="driverClassName" value="${driverClassName}"></property>
    31         <property name="url" value="${url}"></property>
    32         <property name="username" value="${jdbc.username}"></property>
    33         <property name="password" value="${jdbc.password}"></property>
    34     </bean>
    35     <!-- 定义一个模板 -->
    36     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    37         <constructor-arg index="0" ref="dataSource"></constructor-arg>
    38     </bean>
    39 </beans>
    xml
    1 driverClassName=oracle.jdbc.OracleDriver
    2 url=jdbc:oracle:thin:@127.0.0.1:1521:xe
    3 jdbc.username=
    4 jdbc.password=
    5 maxActive=20
    db.properties
    1 package com.xcz.dao;
    2 
    3 public interface XdlBankAccountDao {
    4     int getBankAccount();
    5 }
    dao
     1 package com.xcz.impl;
     2 
     3 import org.springframework.beans.factory.annotation.Autowired;
     4 import org.springframework.jdbc.core.JdbcTemplate;
     5 import org.springframework.stereotype.Repository;
     6 
     7 import com.xcz.dao.XdlBankAccountDao;
     8 
     9 @Repository("bankDao")
    10 public class XdlBankAccountImpl implements XdlBankAccountDao{
    11     @Autowired
    12     private JdbcTemplate jdbcTemplate;
    13     @Override
    14     public int getBankAccount() {
    15         String sql = "select count(1) from xdl_bank_account";
    16         return jdbcTemplate.queryForInt(sql);
    17     }
    18 }
    impl
     1 package com.xcz.test;
     2 
     3 import org.springframework.context.ApplicationContext;
     4 import org.springframework.context.support.ClassPathXmlApplicationContext;
     5 
     6 import com.xcz.dao.XdlBankAccountDao;
     7 import com.xcz.impl.XdlBankAccountImpl;
     8 
     9 public class TestXdlBankAccount {
    10     public static void main(String[] args) {
    11         ApplicationContext ioc = new ClassPathXmlApplicationContext("mvc.xml");
    12         XdlBankAccountDao count = ioc.getBean("bankDao", XdlBankAccountImpl.class);
    13         System.out.println(count.getBankAccount());
    14     }
    15 }
    test
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  • 原文地址:https://www.cnblogs.com/resultset/p/9938142.html
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