spring来了-05-JDBC

概述

1. Spring对C3P0连接池的支持很完善
2. Spring对jdbc提供了JdbcTemplate,来简化jdbc操作, JdbcTemplate模板工具类，类似于DbUtils组件

JDBC:

 package cn.fuyi.h_jdbc;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;

 public class UserDao {

     public void save() {
         try {
             String sql = "insert into dept(dname) values(?)";
             Class.forName("com.mysql.jdbc.Driver");
             Connection connection = DriverManager
                     .getConnection("jdbc:mysql:///mydb", "root", "950613");
             PreparedStatement pstmt = connection.prepareStatement(sql);
             pstmt.setString(1, "test");
             pstmt.execute();

             pstmt.close();
             connection.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }

使用DataSource

 package cn.fuyi.h_jdbc;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;

 import javax.sql.DataSource;

 public class UserDao {

     private DataSource dataSource;
     public void setDataSource(DataSource dataSource) {
         this.dataSource = dataSource;
     }

     public void save() {
         try {
             String sql = "insert into dept(dname) values(?)";
             Class.forName("com.mysql.jdbc.Driver");
             Connection connection = dataSource.getConnection();
             PreparedStatement pstmt = connection.prepareStatement(sql);
             pstmt.setString(1, "test1111");
             pstmt.execute();

             pstmt.close();
             connection.close();
         } catch (Exception e) {
             e.printStackTrace();
         }
     }
 }

     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
         <property name="jdbcUrl" value="jdbc:mysql:///mydb"></property>
         <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
         <property name="user" value="root"></property>
         <property name="password" value="950613"></property>
         <property name="initialPoolSize" value="5"></property>
         <property name="maxPoolSize" value="10"></property>
     </bean>

     <bean id="userDao" class="cn.fuyi.h_jdbc.UserDao">
         <property name="dataSource" ref="dataSource"></property>
     </bean>

使用JdbcTemplate：

　　1）引入jar文件

　　　　spring-jdbc-3.2.5.RELEASE.jar            jdbc支持包

　　　　spring-tx-3.2.5.RELEASE.jar               事务包

　　　　c3p0-0.9.1.2.jar                                c3p0
　　　　mysql-connector-java-5.1.12-bin.jar    驱动类

 package cn.fuyi.h_jdbc;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;

 import javax.sql.DataSource;

 import org.springframework.jdbc.core.JdbcTemplate;

 public class UserDao {

     private DataSource dataSource;
     public void setDataSource(DataSource dataSource) {
         this.dataSource = dataSource;
     }

     public void save1() {
         String sql = "insert into dept(dname) values('test123')";
         JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
         jdbcTemplate.execute(sql);
     }
 }

 <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
         <property name="jdbcUrl" value="jdbc:mysql:///mydb"></property>
         <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
         <property name="user" value="root"></property>
         <property name="password" value="950613"></property>
         <property name="initialPoolSize" value="5"></property>
         <property name="maxPoolSize" value="10"></property>
     </bean>

     <bean id="userDao" class="cn.fuyi.h_jdbc.UserDao">
         <property name="dataSource" ref="dataSource"></property>
     </bean>