概述
近日,在研究 Spring ，看到模板方法有这样一段代码：
一时没有搞明白，经过仔细研究 发现可以用内部类来实现,而Spring
时用接口来实现的。以下时我写的内部类的实现方法：
mysql:
create
database
school;
use
school;
create
table
student( stu_id
int
not
null
primary
key
, stu_name
varchar
(
20
)
not
null
, stu_age
int
);
select
*
from
student;
applicationContext.xml：
<?
xml version="1.0" encoding="UTF-8"
?>
<!
DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"
>
<
beans
>
<
bean
id
="dataSource"
class
="org.apache.commons.dbcp.BasicDataSource"
>
<
property
name
="driverClassName"
>
<
value
>
com.mysql.jdbc.Driver
</
value
>
</
property
>
<
property
name
="url"
>
<
value
>
jdbc:mysql:///school
</
value
>
</
property
>
<
property
name
="username"
>
<
value
>
root
</
value
>
</
property
>
</
bean
>
</
beans
>
DriverManager.java
package
test;
import
javax.sql.DataSource;
import
org.springframework.context.ApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
public
class
DriverManager
...
{
public DataSource getDataSource() ...{
ApplicationContext context = new ClassPathXmlApplicationContext( "applicationContext.xml"); javax.sql.DataSource dataSource = (DataSource) context .getBean("dataSource"); return dataSource;
} public static void main(String[] args) ...{ javax.sql.DataSource d = new DriverManager().getDataSource(); System.out.println(d); }
}
JdbcTemplate.java
package
test;
import
java.sql.PreparedStatement;
import
java.sql.SQLException;
import
javax.sql.DataSource;
public
class
JdbcTemplate
...
{ private DataSource dataSource; public JdbcTemplate(DataSource dataSource) ...{ super(); this.dataSource = dataSource; } static class PreparedStatementSetter ...{ protected java.sql.PreparedStatement pstmt; public void setValues(PreparedStatement pstmt) throws SQLException ...{ this.pstmt = pstmt; } } public void insert(String sql, PreparedStatementSetter pss) ...{ try ...{ java.sql.Connection con = dataSource.getConnection(); java.sql.PreparedStatement pstmt = con.prepareStatement(sql); try ...{ pss.setValues(pstmt); } catch (Exception e) ...{ // TODO 自动生成 catch 块 e.printStackTrace(); } pstmt.executeUpdate(); pstmt.close(); con.close(); } catch (Exception e) ...{ // TODO 自动生成 catch 块 e.printStackTrace(); } } public static void main(String[] args) ...{ DriverManager d = new DriverManager(); javax.sql.DataSource dataSource = d.getDataSource(); JdbcTemplate template = new JdbcTemplate(dataSource); String sql = "insert into student values (?,?,?)"; template.insert(sql, new PreparedStatementSetter() ...{ public void setValues(PreparedStatement pstmt) ...{ try ...{ pstmt.setInt(1, 1112); pstmt.setString(2, "aaaaaaaaaa"); pstmt.setInt(3, 19); } catch (Exception e) ...{ // TODO 自动生成 catch 块 e.printStackTrace(); } } }); }}
最后
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