C# sql update - InvalidOperationException
我正在开发一个需要数据库的项目。
我在 Youtube 上找到了一个教程,它演示了如何使用 SQL Server 2005 连接和编辑数据。
但是当我尝试时,我收到此错误InvalidOperationException
这是整个编辑代码
con.Open();
DataTable dt = new DataTable();
//load all records from sample table
SqlDataAdapter da = new SqlDataAdapter("select * from sampleEdit where ID=" +
textBox1.Text + " ", con);
da.Fill(dt);
//start the editing of the selected record
dt.Rows[0].BeginEdit();
dt.Rows[0][1] = textBox2.Text;
//stop the editing
dt.Rows[0].EndEdit();
//declare the sql commandbuilder that allow saving of records
SqlCommandBuilder cb = new SqlCommandBuilder(da);
//update the database
da.Update(dt);
//close the connection
con.Close();
//call the method that display the record to the gridview
displayRecords();
错误显示在更新部分。
应该是什么问题呢?
这是完整的异常错误
System.InvalidOperationException: Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information.
at System.Data.Common.DbDataAdapter.UpdatingRowStatusErrors(RowUpdatingEventArgs rowUpdatedEvent, DataRow dataRow)
at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping tableMapping)
at System.Data.Common.DbDataAdapter.UpdateFromDataTable(DataTable dataTable, DataTableMapping tableMapping)
at System.Data.Common.DbDataAdapter.Update(DataTable dataTable)
at DatabaseConnect3.Form1.btnEdit_Click(Object sender, EventArgs e)
I am working on a project that needs a database.
I have found a tutorial which I've seen in Youtube, and it demonstrates how to connect and edit data with SQL Server 2005.
But when I tried it, I receive this error InvalidOperationException
This is the whole edit code
con.Open();
DataTable dt = new DataTable();
//load all records from sample table
SqlDataAdapter da = new SqlDataAdapter("select * from sampleEdit where ID=" +
textBox1.Text + " ", con);
da.Fill(dt);
//start the editing of the selected record
dt.Rows[0].BeginEdit();
dt.Rows[0][1] = textBox2.Text;
//stop the editing
dt.Rows[0].EndEdit();
//declare the sql commandbuilder that allow saving of records
SqlCommandBuilder cb = new SqlCommandBuilder(da);
//update the database
da.Update(dt);
//close the connection
con.Close();
//call the method that display the record to the gridview
displayRecords();
The error shows at the update part.
What should be the problem?
this was the full exception error
System.InvalidOperationException: Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information.
at System.Data.Common.DbDataAdapter.UpdatingRowStatusErrors(RowUpdatingEventArgs rowUpdatedEvent, DataRow dataRow)
at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping tableMapping)
at System.Data.Common.DbDataAdapter.UpdateFromDataTable(DataTable dataTable, DataTableMapping tableMapping)
at System.Data.Common.DbDataAdapter.Update(DataTable dataTable)
at DatabaseConnect3.Form1.btnEdit_Click(Object sender, EventArgs e)
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您的源表无效,因为您很可能没有在表上定义主键。只需将 ID 列设置为表的主键,代码就可以工作。
Your source table is invalid because you most likely didn't define a primary key on the table. Just make the ID column the primary key of the table and the code should work.