.NET笔记

[csharp]  <p>1. 连接本地数据库的语句 string str_conn = "server=.;database=Employees;Trusted_Connection=SSPI;";</p><p>2. 使用DataSet获取数据库返回的数据</p>
  [csharp]
  string str_conn = "server=.;database=Employees;Trusted_Connection=SSPI;";
  string sql = string.Format(
  "select * from Admin where LoginID='{0}' and Password='{1}'",
  this.textBoxUser.Text = loginId, this.textBoxPas.Text = loginPwd);
  SqlConnection sqlconn = new SqlConnection(str_conn);
  sqlconn.Open();
  SqlDataAdapter sda = new SqlDataAdapter(sql,str_conn);
  DataSet ds1 = new DataSet();
  sda.Fill(ds1);
  int count = ds1.Tables[0].Rows.Count;
  创建存储过程:
  CREATE PROC[EDURE] 存储过程名
  @参数1 数据类型 =默认值OUTPUT,
  …… ,
  @参数n 数据类型 =默认值 OUTPUT
  AS
  SQL语句
  GO
  T-sql
  DECLARE  @变量名  数据类型
  SET @变量名=值
  SELECT  @变量名= 值
  IF (条件)
  BEGIN
  语句1
  语句2
  ……
  END
  ELSE
  BEGIN
  语句1;
  语句2;
  ……
  END
  WHILE (条件)
  BEGIN
  语句1
  语句2
  ……
  BREAK
  END
  触发器:
  CREATE TRIGGER trigger_name
  ON table_name
  [WITH ENCRYPTION]
  FOR [DELETE,INSERT, UPDATE]
  AS
  T-SQL语句
  GO
  实例:
  CREATE TRIGGER trig_transInfo
  ON transInfo
  FOR INSERT
  AS
  DECLARE @type char(4),@outMoney MONEY
  DECLARE @myCardIDchar(10),@balance MONEY
  SELECT @type=transType,@outMoney=transMoney,
  @myCardID=cardIDFROM inserted
  IF (@type='支取')
  UPDATE bank SET currentMoney=currentMoney-@outMoney
  WHERE cardID=@myCardID
  ELSE

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