初識spring(十一)
14073 ワード
Springのjdbcへのサポート
Springはc 3 p 0でデータベースをサポートできます.
Dept.java
UserDao.java
UserDao1.JAvaこれは伝統的なjdbcです
UserDao2.JAvaはdatasourceを使用してデータベース操作を行います.
bean.xml
Springはc 3 p 0でデータベースをサポートできます.
Dept.java
package cn.itcast.h_jdbc;
public class Dept {
private int deptId;
private String deptName;
public int getDeptId() {
return deptId;
}
public void setDeptId(int deptId) {
this.deptId = deptId;
}
public String getDeptName() {
return deptName;
}
public void setDeptName(String deptName) {
this.deptName = deptName;
}
}
UserDao.java
package cn.itcast.h_jdbc;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;
import org.springframework.jdbc.core.RowMapper;
public class UserDao {
private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
public void save() {
String sql = "insert into t_dept(deptName) values('test');";
jdbcTemplate.update(sql);
}
public Dept findById(int id) {
String sql = "select * from t_dept where deptId=?";
List list = jdbcTemplate.query(sql,new MyResult(), id);
return (list!=null && list.size()>0) ? list.get(0) : null;
}
public List getAll() {
String sql = "select * from t_dept";
List list = jdbcTemplate.query(sql, new MyResult());
return list;
}
class MyResult implements RowMapper{
//
@Override
public Dept mapRow(ResultSet rs, int index) throws SQLException {
Dept dept = new Dept();
dept.setDeptId(rs.getInt("deptId"));
dept.setDeptName(rs.getString("deptName"));
return dept;
}
}
}
UserDao1.JAvaこれは伝統的なjdbcです
package cn.itcast.h_jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class UserDao01 {
/*
*
* :
* 1.
* 2. jdbc
*/
public void save() {
try {
String sql = "insert into t_dept(deptName) values('test');";
Connection con = null;
Statement stmt = null;
Class.forName("com.mysql.jdbc.Driver");
//
con = DriverManager.getConnection("jdbc:mysql:///hib_demo", "root", "root");
//
stmt = con.createStatement();
//
stmt.execute(sql);
//
stmt.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
UserDao2.JAvaはdatasourceを使用してデータベース操作を行います.
package cn.itcast.h_jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import javax.sql.DataSource;
public class UserDao02 {
// IOC
private DataSource dataSource;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
public void save() {
try {
String sql = "insert into t_dept(deptName) values('test');";
Connection con = null;
Statement stmt = null;
//
con = dataSource.getConnection();
//
stmt = con.createStatement();
//
stmt.execute(sql);
//
stmt.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
bean.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver">property>
<property name="jdbcUrl" value="jdbc:mysql:///hib_demo">property>
<property name="user" value="root">property>
<property name="password" value="root">property>
<property name="initialPoolSize" value="3">property>
<property name="maxPoolSize" value="10">property>
<property name="maxStatements" value="100">property>
<property name="acquireIncrement" value="2">property>
bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource">property>
bean>
<bean id="userDao" class="cn.itcast.h_jdbc.UserDao">
<property name="jdbcTemplate" ref="jdbcTemplate">property>
bean>
beans>