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測試MySql連線是否正常

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%@ page import="java.sql.*" %>
<%
//驅動程式名
String driverName="com.mysql.jdbc.Driver";
//資料庫使用者名稱
String userName="";
//密碼
String userPasswd="";
//資料庫名
String dbName="";
//表名
String tableName="";
//聯結字串
String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;

Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection=DriverManager.getConnection(url);
Statement statement = connection.createStatement();
String sql="SELECT * FROM "+tableName;
ResultSet rs = statement.executeQuery(sql);

//獲得資料結果集合
ResultSetMetaData rmeta = rs.getMetaData();

//確定資料集的列數,亦欄位數
int numColumns=rmeta.getColumnCount();
// 輸出每一個數據值
out.print("id");
out.print("|");
out.print("num");
out.print("<br>");
while(rs.next()) {
out.print(rs.getString(1)+" ");
out.print("|");
out.print(rs.getString(2));
out.print("<br>");
}
out.print("<br>");
out.print("資料庫操作成功,恭喜你");
rs.close();
statement.close();
connection.close();

%>