jdbc连接数据库（mysql，sqlserver，oracle）

package com.test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBConn {

public static Connection getConn(String db){
String driverName="";
String dbURL="";
String userName = "";
String userPwd = "";
if(db.equals("sqlServer")){
driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
dbURL = "jdbc:sqlserver://192.168.0.1:1444; DatabaseName=test";
userName = "";
userPwd = "";
}else if(db.equals("oracle")){
driverName = "oracle.jdbc.driver.OracleDriver";
dbURL = "jdbc:oracle:thin:@192.168.0.1:1521:test";
userName = "";
userPwd = "";
}else if(db.equals("mysql")){
driverName = "com.mysql.jdbc.Driver";
dbURL = "jdbc:mysql://192.168.0.1:3306/test";
userName = "";
userPwd = "";
}
Connection dbConn=null;
try {
Class.forName(driverName);
dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
} catch (Exception e) {
e.printStackTrace();
}
return dbConn;
}

public static void main(String[] args) {
Connection dbConn =DBConn.getConn("oracle");
System.out.println(dbConn);
String sql = "select id from table";
PreparedStatement ps;
try {
ps = dbConn.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
while(rs.next())
System.out.println(rs.getInt("id"));
} catch (SQLException e) {
e.printStackTrace();
}
}
}