用Spring和c3p0工具简单的实现增删改查

1.导入Spring和c3p0的jar包

2.配置beans.xml文件

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

        <!-- 配置链接池 -->
    <bean class="com.mchange.v2.c3p0.ComboPooledDataSource" id="c">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/mydb?characterEncoding=GBK"></property>
        <property name="user" value="root"></property>
        <property name="password" value=""></property>

        <!--依次为数据库连接池最大连接数、最小连接数、初始连接数-->
        <property name="maxPoolSize" value="15"></property>
        <property name="minPoolSize" value="5"></property>
        <property name="initialPoolSize" value="5"></property>

    </bean>

</beans>

3.编写代码

实体类Nation

package com.itnba.maya.test;

public class Nation {
    private String code;
    private String name;
    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Nation [code=" + code + ", name=" + name + "]";
    }

}

main函数

修改：

package com.itnba.maya.test;

import java.sql.Connection;import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        JdbcTemplate j =new JdbcTemplate();//造一个工具
        j.setDataSource(ds);
        String sql="update nation set name=? where code=?";
        j.update(sql, "维吾尔族", "n001");
　　}
}

单个数据更新

package com.itnba.maya.test;

import java.sql.Connection;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        JdbcTemplate j =new JdbcTemplate();//造一个工具
        j.setDataSource(ds); 

        String sql = "insert into nation values(?,?)";
        j.update(sql, "n006","侗族");
　　}
}

多个数据更新

package com.itnba.maya.test;

import java.sql.Connection;
import java.util.*;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        JdbcTemplate j =new JdbcTemplate();//造一个工具
        j.setDataSource(ds); 

        String sql = "insert into nation values(?,?)";
      //批量更，用里面是object[]的集合
        List<Object[]> batchArgs=new ArrayList<Object[]>();
        batchArgs.add(new Object[]{"n007","蒙古族"});
        batchArgs.add(new Object[]{"n008","朝鲜族"});
        j.batchUpdate(sql, batchArgs);
　　}
}

查询单行：

package com.itnba.maya.test;

import java.sql.Connection;
import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        JdbcTemplate j =new JdbcTemplate();//造一个工具
        j.setDataSource(ds);
        //查询单个
        String sql="select * from nation where code=?";
        RowMapper<Nation> rowMapper= new BeanPropertyRowMapper<Nation>(Nation.class);
        Nation nation = j.queryForObject(sql, rowMapper,"n001");
        System.out.println(nation);
    }
}

查询多行：

package com.itnba.maya.test;

import java.sql.Connection;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        JdbcTemplate j =new JdbcTemplate();//造一个工具
        j.setDataSource(ds);
        //查询多行
        String sql="select * from nation";
        RowMapper<Nation> rowMapper= new BeanPropertyRowMapper<Nation>(Nation.class);
        List<Nation> list=j.query(sql, rowMapper);
        for(Nation a:list){
            System.out.println(a);
        }
    }
}

查询统计函数

package com.itnba.maya.test;
import java.sql.Connection;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.jdbc.core.JdbcTemplate;import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        JdbcTemplate j =new JdbcTemplate();//造一个工具
        j.setDataSource(ds);
        //查询统计函数
        String sql="select count(*) from nation ";
        long l=j.queryForObject(sql, Long.class);
        System.out.println(l);
    }
}

不用?用 : 的方式查询

package com.itnba.maya.test;

import java.sql.Connection;
import java.util.*;

import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
        DataSource ds= (DataSource) context.getBean("c");

        NamedParameterJdbcTemplate j=new NamedParameterJdbcTemplate(ds);
        String sql="select * from nation where code=:a";
        Map<String, String> paramSource = new HashMap<String,String>();
        paramSource.put("a", "n001");
        RowMapper<Nation> rowMapper= new BeanPropertyRowMapper<Nation>(Nation.class);
        Nation nation = j.queryForObject(sql, paramSource, rowMapper);
        System.out.println(nation);
    }

}