Using Databases in E3: Chapter 6 – Editing Records.

To edit a record of the Historic, you must use the UPDATE clause. This is the SQL code structure.

UPDATE (function used) TABLENAME (table used)
SET FIELDNAME2 (field of the variable to modify) = NEWFIELDVALUE
WHERE FIELDNAME1 (field of the variable used as a filter) = FIELDVALUE

As shown in the next example.

Figure 1: Example SQL code for editing records

In this example, FieldVar2 is the variable to modify and FieldVar is the variable used as a filter.

To select and set a value to a variable, you must write to the variable which is used as a filter, whether it is a date or a value.

The method used to set a filter value and the new value to the selected record is SetVariableValue, as displayed in the following figure.

Figure 2: Script showing how to use the SetVariableValue method

In this example, FieldVar2 is the variable to modify and FieldVar is the variable used as a filter.

Exercise

  1. Create a Query and a button to update values on the table, using the Setpoints created previously.
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