----------------------------------------spring 整合jdbc---------------------

一、

1.spring 容器可以有多种方式连接数据库：

    01.

<!--SpringJDBC需要的jar  只是spring默认的-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>4.2.1.RELEASE</version>
</dependency>

02.

<!--dbcp Aphche比较常用-->

<dependency>
    <groupId>commons-pool</groupId>
    <artifactId>commons-pool</artifactId>
    <version>1.6</version>
</dependency>

<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
</dependency>

3.

<!--c3p0-->

<dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
</dependency>
4.

<!--alibaba datasource-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.0.18</version>
</dependency>

上面是四中方式的依赖
二、我们dao实现以前都是继承basedao现在我们继承JDBCDaoSupport,具体代码如下：代码中有一个

   private JdbcTemplate jdbcTemplate;这属性，spring在底层通过给dataSource赋值就可以给jdbcTemplate给上值。

package cn.bdqn.dao.impl;

import cn.bdqn.Account;
import cn.bdqn.dao.AccountDao;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
    private JdbcTemplate jdbcTemplate;


    public List<Account> selectAccount() {
        String sql="select * from Account";

          注意：我们查询的时候，第二个参数是RowMapper类型的，这里通过匿名类部类实现
        List<Account> list = getJdbcTemplate().query(sql, new RowMapper<Account>() {
            public Account mapRow(ResultSet resultSet, int i) throws SQLException {
                Account account=new Account();
                account.setAid(resultSet.getInt("aid"));
                account.setAname(resultSet.getString("aname"));
                account.setBalance(resultSet.getDouble("balance"));

                return account;
            }
        });
        return list;
    }
}

三、applicationContext.xml文件的代码：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">
    <!--01.加载jdbc.properties文件 的两种方式-->
    <!--<context:property-placeholder location="classpath:jdbc.properties"/>-->
    <bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
       <property name="location" value="classpath:jdbc.properties"/>
   </bean>

    <!-- 02.配置数据源  001.使用spring默认的数据源
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="url" value="${jdbc.jdbcUrl}"/>
        <property name="driverClassName" value="${jdbc.driverClass}"/>
        <property name="username" value="${jdbc.userName}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>-->
    <!--002.dbcp数据源-->  这种配置比较常用
    <!--<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="url" value="${jdbc.jdbcUrl}"/>
        <property name="driverClassName" value="${jdbc.driverClass}"/>
        <property name="username" value="${jdbc.userName}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>-->
    <!--003  c3p0数据源-->
   <!-- <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="jdbcUrl" value="${jdbc.jdbcUrl}"/>
    <property name="driverClass" value="${jdbc.driverClass}"/>
    <property name="user" value="${jdbc.userName}"/>
    <property name="password" value="${jdbc.password}"/>
</bean>-->
    <!--004   使用阿里巴巴de数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${jdbc.jdbcUrl}"/>
        <property name="driverClassName" value="${jdbc.driverClass}"/>
        <property name="username" value="${jdbc.userName}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!--03.配置dao-->
    <bean id="accountDao" class="cn.bdqn.dao.impl.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--04.配置service-->
    <bean id="impl" class="cn.bdqn.service.impl">
        <property name="accountDao" ref="accountDao"/>
    </bean>

</beans>

四、jdbc.properties文件的代码：

jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///mybatis
jdbc.userName=root
jdbc.password=000

五、目录结构：

六、prom.xml 的全部依赖：

<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">
    <parent>
        <artifactId>U3</artifactId>
        <groupId>cn.bdqn</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>springJDBCt14</artifactId>
    <packaging>jar</packaging>

    <name>springJDBCt14</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <!--spring对应的版本号-->
        <spring.version>4.2.1.RELEASE</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.0</version>
            <scope>test</scope>
        </dependency>

        <!--引入需要的spring 核心jar-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>

        <!--引入mysql的驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.26</version>
        </dependency>

        <!--配置jdbc需要的数据源-->
        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.6</version>
        </dependency>

        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>

        <!--SpringJDBC需要的jar-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--alibaba datasource-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>

    </dependencies>
</project>