Winform呼叫儲存過程

農碼一生發表於2022-03-09

資料表及資料準備:

create table Member
(
	MemberId int primary key identity(1,1),
	MemberAccount nvarchar(20) unique,
	MemberPwd nvarchar(20),
	MemberName nvarchar(20),
	MemberPhone nvarchar(20)
)
truncate table Member

insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
values('liubei','123456','劉備','4659874564')
insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
values('guanyu','123456','關羽','42354234124')
insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
values('zhangfei','123456','張飛','41253445')
insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
values('zhangyun','123456','趙雲','75675676547')
insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
values('machao','123456','馬超','532523523')

本文以下內容都藉助於前面封裝的DBHelper類

一、呼叫exec語句執行儲存過程

由於在SQL SERVER內部呼叫儲存過程使用的方式是:

exec 儲存過程名 引數1,引數2,引數3...

所以我們可以在C#中呼叫exec的sql語句,讓此sql語句去呼叫儲存過程,嚴格來說,此種方式並不能稱之為C#呼叫儲存過程,本質上仍然是呼叫的sql語句。

示例:

image

image

需求:採用呼叫儲存過程的方式實現資料的顯示以及資料的新增。

主要程式碼:

SQL儲存過程程式碼:

--查詢Member表所有資料的儲存(沒有引數)
create proc procSelectMember
as
	select * from Member
go
exec procSelectMember

--新增會員資訊(有輸入引數)
create proc procInsertMember
	@acc nvarchar(20),
	@pwd nvarchar(20),
	@memName nvarchar(20),
	@memPhone nvarchar(20)
as
	insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
	values(@acc,@pwd,@memName,@memPhone)
go
exec procInsertMember 'sunwukong','123456','孫悟空','13554856985'

資料顯示C#程式碼:

private void BindData()
{
    DBHelper.PrepareSql("exec procSelectMember");
    this.dataGridView1.DataSource = DBHelper.ExecQuery();
}
private void Form1_Load(object sender, EventArgs e)
{
    BindData();
}

資料新增C#程式碼:

private void btAdd_Click(object sender, EventArgs e)
{
    DBHelper.PrepareSql(string.Format("exec procInsertMember '{0}','{1}','{2}','{3}'"
        ,this.txtAccount.Text,this.txtPwd.Text,this.txtNickName.Text,this.txtPhone.Text));
    DBHelper.ExecNonQuery();
}

二、直接呼叫儲存過程

呼叫儲存過程需要將CommandType執行命令型別設定為CommandType.StoredProcedure儲存過程。

(1)呼叫沒有引數的儲存過程

image

需求:實現資料的顯示。

主要程式碼:

SQL儲存過程程式碼:

--查詢Member表所有資料的儲存(沒有引數)
create proc procSelectMember
as
	select * from Member
go
--呼叫
exec procSelectMember

為了支援儲存過程,給DBHelper新增方法:

public static void PrepareProc(string sql)
{
    OpenConn(); //開啟資料庫連線
    adp = new SqlDataAdapter(sql, conn);
    adp.SelectCommand.CommandType = CommandType.StoredProcedure;
}

窗體程式碼:

private void BindData()
{
    DBHelper.PrepareProc("procSelectMember");
    this.dataGridView1.DataSource = DBHelper.ExecQuery();
}
private void Form1_Load(object sender, EventArgs e)
{
    BindData();
}

(2)呼叫有輸入引數的儲存過程

image

需求:實現資料的新增。

主要程式碼:

SQL儲存過程程式碼:

--新增會員資訊(有輸入引數)
create proc procInsertMember
	@acc nvarchar(20),
	@pwd nvarchar(20),
	@memName nvarchar(20),
	@memPhone nvarchar(20)
as
	insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
	values(@acc,@pwd,@memName,@memPhone)
go
--呼叫
exec procInsertMember 'sunwukong','123456','孫悟空','13554856985'

窗體程式碼:

private void btAdd_Click(object sender, EventArgs e)
{
    DBHelper.PrepareProc("procInsertMember");
    DBHelper.SetParameter("acc", this.txtAccount.Text);
    DBHelper.SetParameter("pwd",this.txtPwd.Text);
    DBHelper.SetParameter("memName", this.txtNickName.Text);
    DBHelper.SetParameter("memPhone", this.txtPhone.Text);
    DBHelper.ExecNonQuery();
}

(3)呼叫有輸入和輸出引數的儲存過程

image

需求:輸入使用者名稱,點選"查詢電話"按鈕,在下面顯示姓名和號碼。

主要程式碼:

SQL儲存過程:

--根據賬號查詢姓名和電話(有輸入引數,有輸出引數)
create proc procGetInfoByAcc
	@acc nvarchar(20),
	@memName nvarchar(20) output,
	@phone nvarchar(20) output
as
	select @memName = (select MemberName from Member where MemberAccount=@acc)
	select @phone = (select MemberPhone from Member where MemberAccount=@acc)
go
--呼叫
declare @name nvarchar(20)
declare @phone nvarchar(20)
exec procGetInfoByAcc 'machao',@name output,@phone output
select @name,@phone

為了支援輸出引數,給DBHelper新增方法:

/// <summary>
/// 設定輸出引數(不指定長度,適合非字串)
/// </summary>
/// <param name="parameterName">引數名稱</param>
/// <param name="dbType">引數型別</param>
public static void SetOutParameter(string parameterName, SqlDbType dbType)
{
    parameterName = "@" + parameterName.Trim();
    SqlParameter parameter = new SqlParameter(parameterName, dbType);
    parameter.Direction = ParameterDirection.Output;
    adp.SelectCommand.Parameters.Add(parameter);
}
/// <summary>
/// 設定輸出引數(指定長度,適合字串)
/// </summary>
/// <param name="parameterName">引數名稱</param>
/// <param name="dbType">引數型別</param>
/// <param name="size">引數長度</param>
public static void SetOutParameter(string parameterName, SqlDbType dbType, int size)
{
    parameterName = "@" + parameterName.Trim();
    SqlParameter parameter = new SqlParameter(parameterName, dbType, size);
    parameter.Direction = ParameterDirection.Output;
    adp.SelectCommand.Parameters.Add(parameter);
}
/// <summary>
/// 獲取引數內容值
/// </summary>
/// <param name="parameterName">引數名稱</param>
/// <returns>引數值</returns>
public static object GetParameter(string parameterName)
{
    parameterName = "@" + parameterName.Trim();
    return adp.SelectCommand.Parameters[parameterName].Value;
}

窗體程式碼:

private void btSearch_Click(object sender, EventArgs e)
{
    DBHelper.PrepareProc("procGetInfoByAcc");
    DBHelper.SetParameter("acc", this.txtAccount.Text);
    DBHelper.SetOutParameter("memName", SqlDbType.NVarChar, 20);
    DBHelper.SetOutParameter("phone", SqlDbType.NVarChar, 20);
    DBHelper.ExecNonQuery();
    this.lblName.Text = "姓名:" + DBHelper.GetParameter("memName").ToString();
    this.lblPhone.Text = "電話:" + DBHelper.GetParameter("phone").ToString();
}

(4)呼叫有輸入輸出引數的儲存過程

image

需求:密碼升級,傳入使用者名稱和密碼;如果使用者名稱密碼正確,並且密碼長度<8,自動升級成8位密碼。

主要程式碼:

SQL儲存過程(SQLSERVER中output引數直接傳入值即可以做輸入引數,也可以做輸出引數):

--密碼升級,傳入使用者名稱和密碼,如果使用者名稱密碼正確,並且密碼長度<8,自動升級成8位密碼
--有輸入輸出引數(密碼作為輸入引數也作為輸出引數)
select FLOOR(RAND()*10) --0-9之間隨機數
create proc procPwdUpgrade
@acc nvarchar(20),
@pwd nvarchar(20) output
as
	if not exists(select * from Member where MemberAccount=@acc and MemberPwd=@pwd)
		set @pwd = ''
	else
	begin
		if len(@pwd) < 8
		begin
			declare @len int = 8- len(@pwd)
			declare @i int = 1
			while @i <= @len
			begin
				
				set @pwd = @pwd + cast(FLOOR(RAND()*10) as varchar(1))
				set @i = @i+1
			end
			update Member set MemberPwd = @pwd where MemberAccount=@acc
		end
	end
go
--呼叫
declare @pwd nvarchar(20) = '123456'
exec procPwdUpgrade 'liubei',@pwd output
select @pwd

為了支援輸入輸出引數,給DBHelper新增方法:

/// <summary>
/// 設定輸入輸出引數(不指定長度,適合非字串)
/// </summary>
/// <param name="parameterName">引數名稱</param>
/// <param name="dbType">引數型別</param>
public static void SetInOutParameter(string parameterName, SqlDbType dbType, object parameterValue)
{
    parameterName = "@" + parameterName.Trim();
    SqlParameter parameter = new SqlParameter(parameterName, dbType);
    parameter.Value = parameterValue;
    parameter.Direction = ParameterDirection.InputOutput;
    adp.SelectCommand.Parameters.Add(parameter);
}
/// <summary>
/// 設定輸入輸出引數(指定長度,適合字串)
/// </summary>
/// <param name="parameterName">引數名稱</param>
/// <param name="dbType">引數型別</param>
/// <param name="size">引數長度</param>
public static void SetInOutParameter(string parameterName, SqlDbType dbType, int size, object parameterValue)
{
    parameterName = "@" + parameterName.Trim();
    SqlParameter parameter = new SqlParameter(parameterName, dbType, size);
    parameter.Value = parameterValue;
    parameter.Direction = ParameterDirection.InputOutput;
    adp.SelectCommand.Parameters.Add(parameter);
}

窗體程式碼:

//密碼升級,傳入使用者名稱和密碼,
//如果使用者名稱密碼正確,並且密碼長度<8,自動升級成8位密碼
private void btUpgrade_Click(object sender, EventArgs e)
{
    DBHelper.PrepareProc("procPwdUpgrade");
    DBHelper.SetParameter("acc", this.txtAccount.Text);
    DBHelper.SetInOutParameter("pwd", SqlDbType.NVarChar, 20, this.txtPwd.Text);
    DBHelper.ExecNonQuery();
    this.lblNewPwd.Text = DBHelper.GetParameter("pwd").ToString();
}

(5)呼叫有返回值的儲存過程

SQLSERVER儲存過程返回值只能是整數。

image

需求:實現資料的新增,由SQLSERVER返回執行的狀態。

主要程式碼:

SQL儲存過程程式碼:

--新增會員資訊(有返回值)
create proc procInsertMember
	@acc nvarchar(20),
	@pwd nvarchar(20),
	@memName nvarchar(20),
	@memPhone nvarchar(20)
as
	insert into Member(MemberAccount,MemberPwd,MemberName,MemberPhone)
	values(@acc,@pwd,@memName,@memPhone)
	declare @myErr int = @@error
	if @myErr = 0
		return 1
	else if @myErr = 2627 --唯一約束
		return -1
	else
		return -100
go
--呼叫
declare @return int
exec @return = procInsertMember 'sunwukong','123456','孫悟空','13554854785'
print @return

為了支援返回值,給DBHelper新增方法:

/// <summary>
/// 設定返回值引數
/// </summary>
/// <param name="parameterName">引數名稱</param>
public static void SetReturnParameter(string parameterName)
{
    parameterName = "@" + parameterName.Trim();
    SqlParameter parameter = new SqlParameter();
    parameter.ParameterName = parameterName;
    parameter.Direction = ParameterDirection.ReturnValue;
    adp.SelectCommand.Parameters.Add(parameter);
}

窗體程式碼:

private void btAdd_Click(object sender, EventArgs e)
{
    try
    {
        DBHelper.PrepareProc("procInsertMember");
        DBHelper.SetParameter("acc", this.txtAccount.Text);
        DBHelper.SetParameter("pwd", this.txtPwd.Text);
        DBHelper.SetParameter("memName", this.txtNickName.Text);
        DBHelper.SetParameter("memPhone", this.txtPhone.Text);
        DBHelper.SetReturnParameter("returnValue");
        DBHelper.ExecNonQuery();
        int result = (int)DBHelper.GetParameter("returnValue");
        if (result == 1)
        	MessageBox.Show("新增成功!");
    }
    catch (Exception ex)
    {
        int result = (int)DBHelper.GetParameter("returnValue");
        if (result == -1)
        	MessageBox.Show("使用者名稱重名了,違反了唯一約束!");
        if (result == -100)
        	MessageBox.Show(ex.Message);
    }
}

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