public static DataSet SelectBookInfoTable(int mode, string str)
{
string SqlStr = "SELECT Book.图书号,书名,作者,出版社,图书分类,存货,价格 AS 原价,标价 FROM BookInfo JOIN Book ON BookInfo.图书号=Book.图书号";
if (mode == 0)
{
SqlStr = "SELECT Book.图书号,书名,作者,出版社,图书分类,存货,价格 AS 原价,标价 FROM BookInfo JOIN Book ON BookInfo.图书号=Book.图书号";
}
else if (mode == 1)
{
SqlStr = "SELECT Book.图书号,书名,作者,出版社,图书分类,存货,价格 AS 原价,标价 FROM BookInfo JOIN Book ON BookInfo.图书号=Book.图书号 WHERE 图书分类 LIKE \'" + str + "\'";
}
else if (mode == 2)
{
SqlStr = "SELECT Book.图书号,书名,作者,出版社,图书分类,存货,价格 AS 原价,标价 FROM BookInfo JOIN Book ON BookInfo.图书号=Book.图书号 WHERE 书名 LIKE \'" + str + "\'";
}
else if (mode == 3)
{
SqlStr = "SELECT Book.图书号,书名,作者,出版社,图书分类,存货,价格 AS 原价,标价 FROM BookInfo JOIN Book ON BookInfo.图书号=Book.图书号 WHERE 出版社 LIKE \'" + str + "\'";
}
else if (mode == 4)
{
SqlStr = "SELECT Book.图书号,书名,作者,出版社,图书分类,存货,价格 AS 原价,标价 FROM BookInfo JOIN Book ON BookInfo.图书号=Book.图书号 WHERE 作者 LIKE \'" + str + "\'";
}
return(MySQLConnector.GetInstance().Select(SqlStr));
}
public static DataSet ShowIncomeStat(int mode)
{
string SqlStr = "";
if (mode == 0)
{
SqlStr = "SELECT year(交易时间) 年,sum(收款金额) AS 销售合计 FROM SellList GROUP BY year(交易时间)";
}
else if (mode == 1)
{
SqlStr = "SELECT year(交易时间) 年,month(交易时间) 月,day(交易时间) 日,sum(收款金额) AS 销售合计 FROM SellList GROUP BY year(交易时间),month(交易时间),day(交易时间)";
}
else if (mode == 2)
{
SqlStr = "SELECT year(交易时间) 年,month(交易时间) 月,sum(收款金额) AS 销售合计 FROM SellList GROUP BY year(交易时间),month(交易时间)";
}
else if (mode == 3)
{
SqlStr = "select year(交易时间) 年份, " +
"case when month(交易时间) between 1 and 3 then '一季度' " +
"when month(交易时间) between 4 and 6 then '二季度' " +
"when month(交易时间) between 7 and 9 then '三季度' " +
"when month(交易时间) between 10 and 12 then '四季度' end 季度, " +
"sum(收款金额) 金额 " +
"from SellList " +
"where year(交易时间) between 1970 and 2030 " +
"group by year(交易时间), " +
"case when month(交易时间) between 1 and 3 then '一季度' " +
"when month(交易时间) between 4 and 6 then '二季度' " +
"when month(交易时间) between 7 and 9 then '三季度' " +
"when month(交易时间) between 10 and 12 then '四季度' end ";
}
return(MySQLConnector.GetInstance().Select(SqlStr));
}
public static void ChangePrice(string isbn, string price)
{
int affected_row = MySQLConnector.GetInstance().Update(
"UPDATE Book SET 标价=\'" + price + "\' WHERE 图书号=\'" + isbn + "\'"
);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void UpgradeVipLevel(string num)
{
int affected_row = MySQLConnector.GetInstance().Update(
"UPDATE VipList SET 会员等级=1+(SELECT 会员等级 FROM VipList WHERE 编号=\'" + num + "\') WHERE 编号=\'" + num + "\'"
);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void AddToSellList(long vipNum, string iSBN, string time, int num, double money, string tranMode, string tranNum, string remarks)
{
int affected_row = MySQLConnector.GetInstance().Insert(
"INSERT INTO SellList VALUES(\'" + vipNum + "\',\'" + iSBN + "\',\'" + time + "\',\'" + num + "\',\'" + money + "\',\'" + tranMode + "\',\'" + tranNum + "\',\'" + remarks + "\')"
);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void AddNewSysUser(string name, string pwd, string power)
{
int affected_row = MySQLConnector.GetInstance().Insert(
"INSERT INTO AdminList VALUES(\'" + name + "\',\'" + pwd + "\',\'" + power + "\',NULL)"
);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void ChangeDiscount(int mode, string text)
{
int affected_row = MySQLConnector.GetInstance().Update(
"UPDATE VipType SET 优惠折扣=\'" + text + "\' WHERE 等级=\'" + mode + "\'"
);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static String FindBestSellingBook(string starttime, string endtime)
{
DataSet ds = MySQLConnector.GetInstance().Select(
"SELECT * FROM (SELECT R.图书号,书名,MAX(销量) AS 销量 FROM BookInfo AS B JOIN (SELECT 图书号,SUM(数量) AS 销量 FROM SellList WHERE 交易时间 BETWEEN \'" + starttime + "\'AND \'" + endtime + "\' GROUP BY 图书号) AS R ON R.图书号=B.图书号 GROUP BY R.图书号,书名) AS R1 WHERE 销量=( SELECT MAX(R.销量) FROM (SELECT R.图书号,书名,MAX(销量) AS 销量 FROM BookInfo AS B JOIN (SELECT 图书号,SUM(数量) AS 销量 FROM SellList WHERE 交易时间 BETWEEN \'" + starttime + "\'AND \'" + endtime + "\' GROUP BY 图书号) AS R ON R.图书号=B.图书号 GROUP BY R.图书号,书名) AS R )"
);
String str = (ds.Tables[0].Rows[0].ItemArray[0].ToString() + " " + ds.Tables[0].Rows[0].ItemArray[1].ToString() + " " + ds.Tables[0].Rows[0].ItemArray[2].ToString());
return(str);
}
public static int InquireBookNumbers(string iSBN)
{
int num = 0;
DataSet ds = MySQLConnector.GetInstance().Select(
"SELECT 存货 FROM Book WHERE 图书号='" + iSBN + "'"
);
num = int.Parse(ds.Tables[0].Rows[0].ItemArray[0].ToString());
return(num);
}
public static void AddNewVip(string num, string name, string pwd_sha1, string phone, string mail)
{
String SqlStem = "INSERT INTO VipList VALUES(\'" + num + "\',\'" + name + "\',\'" + pwd_sha1 + "\',\'" + phone + "\',NULL,\'1\',NULL)";
if (mail.Equals(""))
{
SqlStem = "INSERT INTO VipList VALUES(\'" + num + "\',\'" + name + "\',\'" + pwd_sha1 + "\',\'" + phone + "\',\'" + mail + "\',\'1\',NULL)";
}
int affected_row = MySQLConnector.GetInstance().Insert(SqlStem);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void ChangeVipInfo(string num, string name, string pwd_sha1, string phone, string mail)
{
String SqlStem = "UPDATE VipList SET 用户名=\'" + name + "\',密码=\'" + pwd_sha1 + "\',邮箱= NULL ,手机号=\'" + phone + "\' WHERE 编号=\'" + num + "\'";
if (mail.Equals(""))
{
SqlStem = "UPDATE VipList SET 用户名=\'" + name + "\',密码=\'" + pwd_sha1 + "\',邮箱=\'" + mail + "\',手机号=\'" + phone + "\' WHERE 编号=\'" + num + "\'";
}
int affected_row = MySQLConnector.GetInstance().Update(SqlStem);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void AddNewBooks(string iSBN, string bookname, string authorname, string publishname, string classificationname, double money, string remarks)
{
int affected_row = 0;
affected_row += MySQLConnector.GetInstance().Insert(
"INSERT INTO BookInfo VALUES(\'" + iSBN + "\',\'" + bookname + "\',\'" + authorname + "\',\'" + publishname + "\',\'" + classificationname + "\',\'" + money + "\',\'" + remarks + "\')"
);
affected_row += MySQLConnector.GetInstance().Insert(
"INSERT INTO Book VALUES(\'" + iSBN + "\',\'" + "0" + "\',\'" + money + "\',\'" + remarks + "\')"
);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
public static void ChangeAdminPwd(string oldpwd_sha1, string newpwd_sha1)
{
String SqlStem = "UPDATE AdminList SET 密码 = \'" + newpwd_sha1 + "\'WHERE 用户名 = \'" + LoginInfo.LoginName + "\'" + " AND 密码 = \'" + oldpwd_sha1 + "\'";
int affected_row = MySQLConnector.GetInstance().Update(SqlStem);
if (affected_row == 1)
{
MessageBox.Show("修改成功，Update, Total rows affected:1");
}
else
{
MessageBox.Show("修改失败，Update, Total rows affected:0");
}
}
public static void ExecuteStem(String SqlStem)
{
int affected_row = MySQLConnector.GetInstance().Insert(SqlStem);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
;
if (affected_row == 1)
{
MessageBox.Show("执行成功");
}
else
{
MessageBox.Show("执行失败");
}
}
public static void Replenishment(int mode, string isbn, int num)
{
String SqlStem = "";
if (mode == 1)//修改
{
SqlStem = "UPDATE Book SET 存货 = \'" + num + "\'WHERE 图书号 = \'" + isbn + "\'";
}
else if (mode == 2)
{//增加
SqlStem = "UPDATE Book SET 存货 = \'" + num + "\'+ (SELECT 存货 FROM Book WHERE 图书号 = \'" + isbn + "\') WHERE 图书号 = \'" + isbn + "\'";
}
int affected_row = MySQLConnector.GetInstance().Update(SqlStem);
MessageBox.Show("INSERT, Total rows affected:" + affected_row);
}
/// <summary>
/// 定义公有方法提供一个全局访问点,同时你也可以定义公有属性来提供全局访问点
/// </summary>
/// <returns></returns>
public static MySQLConnector GetInstance()
{
// 当第一个线程运行到这里时，此时会对locker对象 "加锁"，
// 当第二个线程运行该方法时，首先检测到locker对象为"加锁"状态，该线程就会挂起等待第一个线程解锁
// lock语句运行完之后（即线程运行完之后）会对该对象"解锁"
// 双重锁定只需要一句判断就可以了
if (uniqueInstance == null)
{
lock (locker)
{
// 如果类的实例不存在则创建，否则直接返回
if (uniqueInstance == null)
{
uniqueInstance = new MySQLConnector();
}
}
}
return(uniqueInstance);
}
public static DataSet ShowAllDiscounts()
{
return(MySQLConnector.GetInstance().Select(
"SELECT * FROM VipType"
));
}
public static string GetPower(string name)
{
return(MySQLConnector.GetInstance().Select(
"SELECT 权限 FROM AdminList WHERE 用户名='" + name + "'"
).Tables[0].Rows[0].ItemArray[0].ToString());
}
public static DataSet SelectVipSumBuy(string vipnum)
{
return(MySQLConnector.GetInstance().Select(
"SELECT 交易人编号,SUM(收款金额) AS 总消费金额 FROM SellList WHERE 交易人编号<>0 AND 交易人编号 LIKE '" + vipnum + "' GROUP BY 交易人编号"
));
}
public static DataSet SelectVipTTable()
{
return(MySQLConnector.GetInstance().Select(
"SELECT 编号,用户名,密码 AS '密码(已加密)',手机号,邮箱,会员等级 FROM VipList"
));
}
public static DataSet SelectBookTable()
{
return(MySQLConnector.GetInstance().Select(
"SELECT Book.图书号,书名,存货,标价 FROM Book JOIN BookInfo ON Book.图书号=BookInfo.图书号"
));
}
public static DataSet ShowSalesReport(string starttime, string endtime)
{
return(MySQLConnector.GetInstance().Select(
"SELECT R.图书号,书名,MAX(销量) AS 销量 FROM BookInfo AS B JOIN (SELECT 图书号,SUM(数量) AS 销量 FROM SellList WHERE 交易时间 BETWEEN \'" + starttime + "\'AND \'" + endtime + "\' GROUP BY 图书号) AS R ON R.图书号=B.图书号 GROUP BY R.图书号,书名"
));
}
public static String GetNewVipNum()
{
return(MySQLConnector.GetInstance().Select(
"SELECT MAX(编号)+1 FROM VipList"
).Tables[0].Rows[0].ItemArray[0].ToString());
}
public static String Get_Pwd(String str)
{
return(MySQLConnector.GetInstance().Select(
"SELECT 密码 FROM AdminList WHERE 用户名='" + str + "'"
).Tables[0].Rows[0].ItemArray[0].ToString());
}
public static DataSet GetAllEmails()
{
return(MySQLConnector.GetInstance().Select(
"SELECT 邮箱 FROM VipList WHERE 邮箱 IS NOT NULL "
));
}
public static DataSet ShowAllSysUsers()
{
return(MySQLConnector.GetInstance().Select(
"SELECT 用户名,权限,备注 FROM AdminList"
));
}
public static string GetPrice(string isbn)
{
return(MySQLConnector.GetInstance().Select(
"SELECT 标价 FROM Book WHERE 图书号='" + isbn + "'"
).Tables[0].Rows[0].ItemArray[0].ToString());
}
public static DataSet SelectSellListTable(string starttime, string endtime)
{
return(MySQLConnector.GetInstance().Select(
"SELECT * FROM SellList WHERE 交易时间 BETWEEN \'" + starttime + "\' AND \'" + endtime + "\'"
));
}