- SQLCol and SQLGetCol functions: different types of browse
- Current line in the query
- Query without result
- Using tabulations in the items
- Retrieving Float items on Oracle (via ODBC)
- Managing spaces at the end of text 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. See Types of SQL browse for more details. Versions 19 and later New in version 19 Versions 21 and later New in version 21
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 (with or without quotes) Query name: - created and run by SQLExec (with quotes),
- run by SQLExecWDR (with or without quotes).
<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: "SQLFirst/SQLCol" browse.
- SQLGetCol: "SQLFetch/SQLGetCol" browse.
Remark: From version 19, HFSQL is the new name of HyperFileSQL. Current line in the query SQLCol must not be called if the query returned no result: the test of the SQL.Out variable must be run when you are positioned in the query result and before you call 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 running a query in ODBC, the tabulations are not retrieved by SQLCol. To retrieve the value of items (with TAB characters), we recommend that you use a SQLFetch/SQLGetCol browse.
- 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 a SQLFetch/SQLGetCol browse.
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 The tabulations found in the result items are automatically retrieved by SQLCol.
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