SQLCol (Function)

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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

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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

This function is now available in Android Widget mode (accessing the external databases via a Webservice).

This function is now available for the Android applications (accessing the external databases via a Webservice).

This function is now available for the iPhone/iPad applications (accessing the external databases via a Webservice).

New in version 19

This function is now available in Android Widget mode (accessing the external databases via a Webservice).

This function is now available for the Android applications (accessing the external databases via a Webservice).

This function is now available for the iPhone/iPad applications (accessing the external databases via a Webservice).

This function is now available in Android Widget mode (accessing the external databases via a Webservice).

This function is now available for the Android applications (accessing the external databases via a Webservice).

This function is now available for the iPhone/iPad applications (accessing the external databases via a Webservice).

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

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

See Types of SQL browse for more details.

Remark: From version 19, HFSQL is the new name of HyperFileSQL.

Current line in the query

To position on a line of the query, use one of the following functions: SQLFirst, SQLNext, SQLPrevious, SQLLast or SQLSeek.

Query without result

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: Execution of a query by OLEDB, HFSQL or Native Connector
The tabulations found in the result items are automatically retrieved by SQLCol.

Retrieving Float items on Oracle (via ODBC)

By default, the decimal separator used for the Float items on Oracle is the dot. However, the ODBC driver returns the value by using the comma as decimal separator. The decimal places are lost when the value is assigned to a numeric control.

To avoid this problem, you must configure the decimal separator for the current connection:

// Connection to the Oracle database
SQLConnect("MyOracleDatabase", "User", "Pass", "", "ODBC")
// Request for changing the decimal separator
SQLExec("ALTER SESSION SET NLS_NUMERIC_CHARACTERS ='. '", "TempQry")

Managing spaces at the end of text items

The management of spaces at the end of the retrieved items depends on the access mode used:

Native Connectors for SQLServer, ORACLE, AS400, SyBase; and access to HFSQL Client/Server or HFSQL Classic data: spaces at the end of the item are automatically removed.
Native Connectors for Access, MySQl, MariaDB, Informix, DB2, Progress, PostgreSQL, SQLite, ODBC or OleDB: the spaces at the end of the item are kept.

Tip: In order not to keep the spaces on the right in all cases, it is possible to override the function by declaring a global procedure:

PROCEDURE SQLCol(source,index)RESULT NoSpace(WL.SQLCol(source, index), sscRight)

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