ADD file via upload

Adduser.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 Adduser {
+
+	public static Boolean adduser(String user, String studentid, String name, String password) {
+
+		Connection con = ConnectDatabase.connectDB();
+
+		PreparedStatement preSql;
+
+		String sqlStr=null;
+		
+		if(userlist()) {
+			sqlStr = "insert into usertable values (?,?,?,?,0)";
+		}else {
+			sqlStr = "insert into usertable values (?,?,?,?,1)";
+		}
+
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setString(1, user);
+			preSql.setString(2, studentid);
+			preSql.setString(3, name);
+			preSql.setString(4, password);
+			int ok = preSql.executeUpdate();
+			con.close();
+			return true;
+		} catch (SQLException e) {
+			JOptionPane.showMessageDialog(null, "用户名已存在", "警告", JOptionPane.WARNING_MESSAGE);
+			return false;
+		}
+	}
+	
+	//判断用户是否存在
+	public static boolean userlist() {
+		Connection con = ConnectDatabase.connectDB();
+
+		PreparedStatement preSql;
+
+		ResultSet rs;
+
+		String sqlStr = "select * from usertable";
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			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;
+		}
+	}
+}

BorrowRecords.java

@@ -0,0 +1,134 @@
+package database;
+
+import java.sql.Connection;
+import java.sql.Date;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Arrays;
+import java.util.Vector;
+
+import javax.swing.JOptionPane;
+
+
+public class BorrowRecords {
+	public BorrowRecords() {
+	}
+	//借阅图书
+	public static void Borrow(String user, int bookid, String bookname) {
+		Connection con = ConnectDatabase.connectDB();
+
+		PreparedStatement preSql;
+
+		String sqlStr = "insert into borrowrecords(user,bookid,bookname,borrowtime,returntime,status) values (?,?,?,now(),null,?)";
+
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setString(1, user);
+			preSql.setInt(2, bookid);
+			preSql.setString(3, bookname);
+			preSql.setString(4, "未还");
+			int ok = preSql.executeUpdate();
+			con.close();
+			ChangeBorrowState(bookid);
+		} catch (SQLException e) {
+		}
+	}
+	//借阅图书修改图书状态
+	private static void ChangeBorrowState(int bookid) {
+		Connection con = ConnectDatabase.connectDB();
+
+		PreparedStatement preSql;
+
+		String sqlStr = "update booktable set state=? where bookid = ?";
+
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setString(1, "外借");
+			preSql.setInt(2, bookid);
+			
+			int ok = preSql.executeUpdate();
+			con.close();
+		} catch (SQLException e) {
+		}
+	}
+	
+	//还书
+	public static void Return(String user, int bookid) {
+		Connection con = ConnectDatabase.connectDB();
+
+		PreparedStatement preSql;
+		String sqlStr = "select now()";
+		ResultSet rs;
+		Date date=null;
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			rs = preSql.executeQuery();
+			while(rs.next()) {
+				date = rs.getDate(1);
+			}
+			sqlStr = "update borrowrecords set returntime =  ? where bookid = ? and user = ? and status = ?";
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setDate(1, date);
+			preSql.setInt(2, bookid);
+			preSql.setString(3, user);
+			preSql.setString(4, "未还");
+			int ok = preSql.executeUpdate();
+			
+			sqlStr = "update borrowrecords set status = ? where bookid = ? and user = ? and status = ?";
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setString(1, "已还");
+			preSql.setInt(2, bookid);
+			preSql.setString(3, user);
+			preSql.setString(4, "未还");
+			ok = preSql.executeUpdate();
+			
+			con.close();
+			ChangeReturnState(bookid);
+		} catch (SQLException e) {
+		}
+	}
+	//还书图书修改图书状态
+	private static void ChangeReturnState(int bookid) {
+		Connection con = ConnectDatabase.connectDB();
+
+		PreparedStatement preSql;
+
+		String sqlStr = "update booktable set state=? where bookid = ?";
+
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setString(1, "在馆");
+			preSql.setInt(2, bookid);
+			
+			int ok = preSql.executeUpdate();
+			con.close();
+		} catch (SQLException e) {
+		}
+	}
+	//比对还书
+	public static boolean comparison(String user,int bookid) {
+		Connection con = ConnectDatabase.connectDB();
+		PreparedStatement preSql;
+		ResultSet rs;
+		String sqlStr = "select * from borrowrecords where bookid = ? and status = ?";
+		try {
+			preSql = con.prepareStatement(sqlStr);
+			preSql.setInt(1, bookid);
+			preSql.setString(2, "未还");
+			rs = preSql.executeQuery();
+			while (rs.next()) {
+				String user2 = rs.getString(2);
+				if(user2.equals(user)) {
+					return true;
+				}else {
+					return false;
+				}
+			}
+			con.close();
+			return false;
+		} catch (SQLException e) {
+			return false;
+		}
+	}
+}

UpdateAdmin.java

@@ -0,0 +1,103 @@
+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) {
+		}
+	}
+}