用Spring和c3p0工具简单的实现增删改查详解编程语言

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); 
    } 
 
}

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/16991.html

用Spring和c3p0工具简单的实现增删改查详解编程语言

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