Hi @StewartBW , Welcome to Microsoft Q&A,
When you use parameterized queries to update table fields, you can follow these steps:
Using command As New OleDbCommand("UPDATE [Table] SET Column1 = ? WHERE ConditionColumn = ?", connection)
command.Parameters.AddWithValue("@param1", newValue)
command.Parameters.AddWithValue("@param2", conditionValue)
command.ExecuteNonQuery()
End Using
In this example:
-
UPDATE [Table] SET Column1 = ?
is the basic format of a SQL update statement, which tells the database which field of which table you want to update, and replaces the field values with question marks so that they can be replaced later using a parameterized query. -
WHERE ConditionColumn = ?
is optional and allows you to specify a condition to determine which rows will be updated. Conditional columns and conditional values are also provided using parameterized queries.
In the command.Parameters.AddWithValue
method, the first parameter is the parameter name you used in the SQL statement, and the second parameter is the value to be inserted. This way you can safely send parameters to the database without worrying about SQL injection attacks.
The difference between using Parameters.Add
or Parameters.AddWithValue
method to add parameters is:
- The
Parameters.Add
method requires you to explicitly specify the data type of the parameter, while theParameters.AddWithValue
method automatically infers the data type based on the provided value. - The
Parameters.Add
method can provide more control, such as specifying the data type, size, direction, etc. of the parameters, while theParameters.AddWithValue
method is more concise and can add parameters faster.
The following is an example of using the Parameters.Add
method:
Using command As New OleDbCommand("UPDATE [Table] SET Column1 = ? WHERE ConditionColumn = ?", connection)
command.Parameters.Add("@param1", OleDbType.VarChar).Value = newValue
command.Parameters.Add("@param2", OleDbType.Integer).Value = conditionValue
command.ExecuteNonQuery()
End Using
When using the Parameters.Add
method, you need to specify the data type of the parameter, such as OleDbType.VarChar
or OleDbType.Integer
. Doing this ensures that the type of the parameter matches the type of the database column, improving the safety and reliability of the code.
Best Regards,
Jiale
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