Question

首先，我允许用户输入组合框，以便在有很多项目时快速搜索。我想知道如果用户不小心按下另一个字母并且它将导致null，我是否可以停止插入查询，并且我有sscanf()阻止但它只显示错误消息但主键跳过一个数字。

选择ProjectID以填充comboBox

try catch

插入数据库：

private void GetProjectID()
{
    newConnection.ConnectionM();
    SqlCommand cmd = SqlConnectionOLTP.cn.CreateCommand();
    cmd.CommandText = "Select * from Project where ProjectName='" + comboBoxProjectTitle.Text + "' ";
    try
    {
        SqlDataReader reader = cmd.ExecuteReader();
        while(reader.Read())
        {
            ProjectID = reader.GetInt32(0);

        }
        reader.Close();
        SqlConnectionOLTP.cn.Close();
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

Answer 1

SET IDENTITY_INSERT <TableName> ON
-- Do the inserting in the table with name <TableName>
SET IDENTITY_INSERT <TableName> OFF

Answer 2

在SSMS上运行此代码，即sql server management studio

 ALTER TABLE [Project] DROP ProjectID 
   SET IDENTITY_INSERT <Project> OFF

如何在插入查询时避免主键自动增加？

2 个答案: