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UpdateAdmin.java

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package database;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import javax.swing.JOptionPane;

public class UpdateAdmin {

//判断用户是否存在

public static boolean sureuser(String user) {

Connection con = ConnectDatabase.connectDB();

PreparedStatement preSql;

ResultSet rs;

String sqlStr = "select * from usertable where user = ?";

try {

preSql = con.prepareStatement(sqlStr);

preSql.setString(1, user);

rs = preSql.executeQuery();

boolean flag = false;

while(rs.next()) {

flag = true;

return true;

}

if(!flag) {

return false;

}

con.close();

return false;

} catch (SQLException e) {

return false;

}

}

//删除用户

public static void deleteuser(String user) {

Connection con = ConnectDatabase.connectDB();

PreparedStatement preSql;

String sqlStr = "delete from usertable where user = ?";

try {

preSql = con.prepareStatement(sqlStr);

preSql.setString(1, user);

int ok = preSql.executeUpdate();

con.close();

} catch (SQLException e) {

}

}

//更改为用户

public static void updateuser(String user) {

Connection con = ConnectDatabase.connectDB();

PreparedStatement preSql;

String sqlStr = "update usertable set admin = ? where user = ?";

try {

preSql = con.prepareStatement(sqlStr);

preSql.setInt(1, 0);

preSql.setString(2, user);

int ok = preSql.executeUpdate();

con.close();

} catch (SQLException e) {

}

}

//添加为管理员

public static void updateadmin(String user) {

Connection con = ConnectDatabase.connectDB();

PreparedStatement preSql;

String sqlStr = "update usertable set admin = ? where user = ?";

try {

preSql = con.prepareStatement(sqlStr);

preSql.setInt(1, 1);

preSql.setString(2, user);

int ok = preSql.executeUpdate();

con.close();

} catch (SQLException e) {

}

}

//更改密码

public static void updatepass(String user,String password) {

Connection con = ConnectDatabase.connectDB();

PreparedStatement preSql;

String sqlStr = "update usertable set password = ? where user = ?";

try {

preSql = con.prepareStatement(sqlStr);

preSql.setString(1, password);

preSql.setString(2, user);

int ok = preSql.executeUpdate();

con.close();

} catch (SQLException e) {

}

}

}