使用 C# 将外键插入到带有 SQL 查询的表中

Question

I have a database with 3 tables Identification , Identification_group and Group .

The Identification_group table has 2 foreign key columns, Identificaiton_id and Group_id .

In my form you can select the Group Number and it returns the right Group_id to the Identification_group table.

Is it possible to write a SQL query that uses the last Identification_id and the Group_id (from the selection field in my form) and writes this to the Identification_group table?

string sqlquery1 = "Insert into [dbo].[identification_group] (fk_group_id,fk_identification_id values (@fk_group_id,@fk_identification_id;";
            SqlCommand schreiben = new SqlCommand(sqlquery1, myConnection);
            myConnection.Open();
            schreiben.Parameters.AddWithValue("@fk_identification_id", intidentification_id);
            schreiben.Parameters.AddWithValue("@fk_group_id", Wil_Jls_idComboBox.SelectedValue);
schreiben.CommandText = sqlquery;
schreiben.ExecuteNonQuery();
            myConnection.Close();

Sorry for the bad formatting, first time posting here.

Thank you in advance

Answer 1

Please try the below:

You have an issue with your SQL statement whereby you did not close the brackets. Also, you only need the @ symbol in the SQL statement, and not in the C# code.

// Create the query
string query = "Insert into [identification_group] (fk_group_id, fk_identification_id) values (@fk_group_id, @fk_identification_id)";

// Create the SQL command
SqlCommand schreiben = new SqlCommand(query, myConnection);

// Open the SQL connection
myConnection.Open();

// Bind the parameters
schreiben.Parameters.AddWithValue("fk_identification_id", intidentification_id);
schreiben.Parameters.AddWithValue("fk_group_id", Wil_Jls_idComboBox.SelectedValue);

// Bind the command
schreiben.CommandText = query;

// Execute the command
schreiben.ExecuteNonQuery();

// Close the connection
myConnection.Close();

Answer 2

I have a database with 3 tables Identification , Identification_group and Group .

The Identification_group table has 2 foreign key columns, Identificaiton_id and Group_id .

In my form you can select the Group Number and it returns the right Group_id to the Identification_group table.

Is it possible to write a SQL query that uses the last Identification_id and the Group_id (from the selection field in my form) and writes this to the Identification_group table?

string sqlquery1 = "Insert into [dbo].[identification_group] (fk_group_id,fk_identification_id values (@fk_group_id,@fk_identification_id;";
            SqlCommand schreiben = new SqlCommand(sqlquery1, myConnection);
            myConnection.Open();
            schreiben.Parameters.AddWithValue("@fk_identification_id", intidentification_id);
            schreiben.Parameters.AddWithValue("@fk_group_id", Wil_Jls_idComboBox.SelectedValue);
schreiben.CommandText = sqlquery;
schreiben.ExecuteNonQuery();
            myConnection.Close();

Sorry for the bad formatting, first time posting here.

Thank you in advance