对应在数据库中表格 rocars表的msg_id,ccrn两个字段。现在要实现在界面上修改ccrn的值，ajax提交到response.jsp页面，并调用RocarsEntiy.updateCcrn方法更新对应的ccrn，最后无刷新显示
代码：
request.jsp
代码如下:
Insert title here
rocarsId:
ccrn:
response.jsp
代码如下:
RocarsEntity.java
代码如下:
package com.lwf.eus.entity;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import com.lwf.eus.bean.RocarsBean;
import com.lwf.eus.util.ConnectionManager;
public class RocarsEntity {
public static Vector getRocarsList() {
Vector vRocars = new Vector();
//Connection conn = ConnectionManager.getConnection();
Connection conn = ConnectionManager.getConnectionFromDS();
Statement st = ConnectionManager.createStatement(conn);
String sql = "select msg_id,ccrn from rocars";
ResultSet rs = null;
try {
rs = st.executeQuery(sql);
while (rs.next()) {
RocarsBean rocars = new RocarsBean();
rocars.setRocarsId(rs.getString(1));
rocars.setCcrn(rs.getString(2));
vRocars.addElement(rocars);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (st != null) {
st.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
return vRocars;
}
}
public static RocarsBean getRocarsListById(String rocarsId){
Connection conn = ConnectionManager.getConnectionFromDS();
Statement st = ConnectionManager.createStatement(conn);
String sql = "select * from rocars where msg_id=" + rocarsId;
ResultSet rs = null;
RocarsBean rocars= null;
try {
rs = st.executeQuery(sql);
rocars = new RocarsBean();
while (rs.next()) {
rocars.setRocarsId(rs.getString("msg_id"));
rocars.setCcrn(rs.getString("ccrn"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (st != null) {
st.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
return rocars;
}
}
public static void updateCcrnById(String rocarsId, String ccrn)
{
Connection conn = null;
Statement stmt = null;
try {
conn = ConnectionManager.getConnectionFromDS();
stmt = ConnectionManager.createStatement(conn);
String sqlStr = "update rocars set ccrn= '"+ ccrn + "'" + "where msg_id=" + rocarsId ;
stmt.executeUpdate(sqlStr);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
ConnectionManager.java
这里可以直接使用JDBC也可以调用weblogic的数据源JNDI。
代码如下:
package com.lwf.eus.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
public class ConnectionManager {
public static Connection getConnection(){
Connection conn = null;
String url = "jdbc:postgresql://192.168.0.180/getseus";
String userName = "getsdbadmin";
String pwd = "powerdb";
try {
Class.forName("org.postgresql.Driver").newInstance();
conn = DriverManager.getConnection(url,userName,pwd);
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (Exception e){
e.printStackTrace();
}
return conn;
}
public static Connection getConnectionFromDS(){
Connection conn = null;
Context ctx = null;
try {
ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("JNDIPG");
conn = ds.getConnection();
} catch (NamingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static Statement createStatement(Connection conn){
Statement st = null;
try {
st = conn.createStatement();
} catch (SQLException e) {
e.printStackTrace();
}
return st;
}
}