当我使用SqlCommand
插入数据时,它还会在我刚刚插入的值之前添加空格。如何避免添加空格?
这是插入查询代码:
SqlCommand cmd1 = new SqlCommand("INSERT INTO [Contracts].[dbo].[Contract]
([Contract_Id],[Name],[Description],[Contracted_by],[Vendor_Name],[Related_Dept],[Start_date],[Expiration_Date],[TypeofContract],[Contact_Person],[Contact_No],FileName,FileData,FileType)
VALUES (' " + TextBox1.Text + "',' " + TextBox2.Text + "',' " + TextBox3.Text + "',' " + TextBox4.Text + "',' " + TextBox5.Text + "',' " + DepartmentTextBox.SelectedValue.ToString() + "',' " + TextBox7.Text + "',' " + TextBox8.Text + "',' " + TextBox9.Text + "',' " + TextBox10.Text + "',' " + TextBox11.Text + "',@Name,@Data,@Type)", con);
答案 0 :(得分:3)
当您使用字符串连接来构建命令文本时,当然会出现任何类型的问题。在您的情况下,您无意中在控制值之前添加了一个空格 如果您使用了参数化查询,则不会出现此问题
SqlCommand cmd1 = new SqlCommand("INSERT INTO [Contracts].[dbo].[Contract] " +
"([Contract_Id],[Name],[Description],[Contracted_by],[Vendor_Name],[Related_Dept]," +
"[Start_date],[Expiration_Date],[TypeofContract],[Contact_Person]," +
"[Contact_No],FileName,FileData,FileType) VALUES (" +
"@cid, @name, @desc, @cby, @vname, @rdept, @stdate, @expdate, " +
"@tc, @cp, @cno, @file, @fdate, @ftype",con)
SqlParameter p = new SqlParameter("@cid", SqlDbType.Int).Value = Convert.ToInt32(textBox1.Text));
cmd.Parameters.Add(p);
.... and so on for the other parameters required
顺便说一下,请记住,如果您有IDENTITY列,则不应尝试在该列中插入任何内容(Contract_ID特别怀疑此处)
答案 1 :(得分:0)
它正在插入空格,因为查询字符串中有额外的空格。我将"',' "
更改为"','"
:
SqlCommand cmd1 = new SqlCommand("INSERT INTO [Contracts].[dbo].[Contract] ([Contract_Id],
[Name],[Description],[Contracted_by],[Vendor_Name],[Related_Dept],[Start_date],
[Expiration_Date],[TypeofContract],[Contact_Person], Contact_No],FileName,FileData,FileType)
VALUES ('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" +
TextBox4.Text + "','" + TextBox5.Text + "','" + DepartmentTextBox.SelectedValue.ToString()
+ "','" + TextBox7.Text + "','" + TextBox8.Text + "','" + TextBox9.Text + "','" +
TextBox10.Text + "','" + TextBox11.Text + "',@Name,@Data,@Type)", con);