spring来了-05-JDBC

Posted 2020-08-06 起今知行 | 思考者 | Freedom

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:

 1 package cn.fuyi.h_jdbc;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.PreparedStatement;
 6 
 7 public class UserDao {
 8 
 9     public void save() {
10         try {
11             String sql = "insert into dept(dname) values(?)";
12             Class.forName("com.mysql.jdbc.Driver");
13             Connection connection = DriverManager
14                     .getConnection("jdbc:mysql:///mydb", "root", "950613");
15             PreparedStatement pstmt = connection.prepareStatement(sql);
16             pstmt.setString(1, "test");
17             pstmt.execute();
18             
19             pstmt.close();
20             connection.close();
21         } catch (Exception e) {
22             e.printStackTrace();
23         }
24     }
25 }

 

使用DataSource

 1 package cn.fuyi.h_jdbc;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.PreparedStatement;
 6 
 7 import javax.sql.DataSource;
 8 
 9 public class UserDao {
10     
11     private DataSource dataSource;
12     public void setDataSource(DataSource dataSource) {
13         this.dataSource = dataSource;
14     }
15 
16     public void save() {
17         try {
18             String sql = "insert into dept(dname) values(?)";
19             Class.forName("com.mysql.jdbc.Driver");
20             Connection connection = dataSource.getConnection();
21             PreparedStatement pstmt = connection.prepareStatement(sql);
22             pstmt.setString(1, "test1111");
23             pstmt.execute();
24             
25             pstmt.close();
26             connection.close();
27         } catch (Exception e) {
28             e.printStackTrace();
29         }
30     }
31 }

 1     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
 2         <property name="jdbcUrl" value="jdbc:mysql:///mydb"></property>
 3         <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
 4         <property name="user" value="root"></property>
 5         <property name="password" value="950613"></property>
 6         <property name="initialPoolSize" value="5"></property>
 7         <property name="maxPoolSize" value="10"></property>
 8     </bean>
 9     
10     <bean id="userDao" class="cn.fuyi.h_jdbc.UserDao">
11         <property name="dataSource" ref="dataSource"></property>
12     </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

 1 package cn.fuyi.h_jdbc;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.PreparedStatement;
 6 
 7 import javax.sql.DataSource;
 8 
 9 import org.springframework.jdbc.core.JdbcTemplate;
10 
11 public class UserDao {
12     
13     private DataSource dataSource;
14     public void setDataSource(DataSource dataSource) {
15         this.dataSource = dataSource;
16     }
17     
18     public void save1() {
19         String sql = "insert into dept(dname) values(‘test123‘)";
20         JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
21         jdbcTemplate.execute(sql);
22     }
23 }

 1 <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
 2         <property name="jdbcUrl" value="jdbc:mysql:///mydb"></property>
 3         <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
 4         <property name="user" value="root"></property>
 5         <property name="password" value="950613"></property>
 6         <property name="initialPoolSize" value="5"></property>
 7         <property name="maxPoolSize" value="10"></property>
 8     </bean>
 9     
10     <bean id="userDao" class="cn.fuyi.h_jdbc.UserDao">
11         <property name="dataSource" ref="dataSource"></property>
12     </bean>