Question

在javaz中sqlserver连接的代码怎么修改成mysql连接代码？

package bean;

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

public class JdbcUtil {
static Connection con;

public static Connection getConnection() {

try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url = "jdbc:sqlserver://localhost:1433; DatabaseName=LuceneDB2";
//String username = "sa";
//String password = "1";
String username = "sa";
String password = "123456";
con = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return con;
}

// 执行sql语句 增删改
public int updateExecute(String sql) {
int result = 0;
try {
Connection con = getConnection();
Statement sta = con.createStatement();
result = sta.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
}
return result;
}

// 执行sql查询语句 返回一个ResultSet
public ResultSet queryExectue(String sql) {
ResultSet rs = null;
try {
Connection con = getConnection();
Statement sta = con.createStatement();
rs = sta.executeQuery(sql);
} catch (SQLException e) {
e.printStackTrace();
}
return rs;
}
public String executeScalar(String sql) {
ResultSet rs = queryExectue(sql);
String s = "";
try {
while (rs.next()) {
s = rs.getString(1);
}
} catch (SQLException e) {
e.printStackTrace();
}
return s;
}
}

Answer 1

import java.sql.*;
public class apple {
public static void main(String[] args) {

PreparedStatement ps=null;
Connection ct=null;
ResultSet rs=null;
try{
//1.加载驱动
Class.forName("com.mysql.jdbc.Driver");
//2.得到连接
ct=DriverManager.getConnection("jdbc:mysql://localhost:3306/SMILE_OA","sa","wuh11@");
//3.设定“发送器”,功能:给数据库系统发送sql语句
ps=ct.prepareStatement("select * from 你的表");

}catch(Exception e)
{
e.printStackTrace();

}finally{

//关闭资源
try
{

if(rs!=null) rs.close();
if(ct!=null) ct.close();

}catch(Exception e)
{
e.printStackTrace();
}

}

}

}