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- SQLCol and SQLGetCol functions: different types of browse
- Current row in the query
- Query without result
- Using tabulations in the items
SQLCol (Function) In french: SQLCol Retrieves the content of the specified column from the query result, for the current line. Caution: This function must be used during a SQLFirst/SQLCol browse of the query result. For more details, see Types of SQL browse. ResExec = SQLExec("SELECT CUSTNAME FROM INVOICE", "QRY1")
IF ResExec = True THEN
        SQLFirst("QRY1")
        // Transfer the name into LIST_NAME
        WHILE NOT SQL.Out
                ListAdd(LIST_NAME, SQLCol("QRY1", 1))
                SQLNext("QRY1")
        END
ELSE
        // ProcessError
END
SQLClose("QRY1")
Syntax
<Result> = SQLCol(<Query name> , <Column number>)
<Result>: Character string Value of the column. <Query name>: Character string Query name: <Column number>: Integer Number of the column to retrieve. This column corresponds to a query column (and not to a table column). The order of the numbers for the columns to retrieve is not important. Remarks SQLCol and SQLGetCol functions: different types of browse SQLCol and SQLGetCol are equivalent during an OLE DB or HFSQL access. However, you must respect the type of browse associated with each one of these functions: - SQLCol function: "SQLFirst/SQLCol" browse.
- SQLGetCol function: "SQLFetch/SQLGetCol" browse.
SQLCol should not be called if the query did not return a result: the SQL.Out variable must be tested once the position has been set in the query result, before calling SQLCol. For example: // Retrieve the value of the 1st column for the 1st record
Value is string
QueryText is string
QueryText = "SELECT CUSTNAME, ADDR1, ADDR2, CITY, ZIP FROM INV"
SQLExec(QueryText, "QRY1")
Value = SQLCol("QRY1", 1)
Using tabulations in the items The SQL functions are used to insert tabulations into the file items. The management of tabulations depends on the access mode used. 1st case: Running a query in ODBC: - When executing a query with ODBC, SQLCol does not return tabs. To get the value of the items (with Tabs), use SQLFetch/SQLGetCol.
- When running a query in ODBC, the space characters found at the end of the value of items are removed. To keep all the space characters, we recommend that you use SQLFetch/SQLGetCol.
Example: SQLAssociate and the tabulations in the items The items of the records to retrieve are as follows: | | | | Item 1 | Item 2 | | Record 1 | John | Smith | | Record 2 | John + tab + Mac | Doughnut |
For the first record: - SQLCol(Qry1, 1): retrieves John
- SQLCol(Qry1, 2): retrieves Smith
For the second record: - SQLCol(QRY,1 ): retrieves John
- SQLCol(QRY, 2): retrieves Mac, but Mac does not correspond to the value of the second item
- SQLCol(QRY, 3): retrieves Doughnut, value of the second item
2nd case: Running a query via OLEDB, HFSQL or Native Connector
SQLCol automatically retrieves the tabs in the result items.
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