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Purpose
Returns a column heading from a Net.Data table.
Format
@DTW_TB_GETN(table, col, name)
@DTW_TB_rGETN(table, col)
Parameters
Table 134. DTW_TB_GETN Parameters
Data Type | Parameter | Use | Description |
---|---|---|---|
table | table | IN | The macro table variable from which a column name is returned. |
integer | col | IN | The column number of the column whose name is to be returned. |
string | name | OUT | A variable that contains the name of the column specified in col. |
Return Codes
Table 135. DTW_TB_GETN Return Codes
Return Code | Explanation |
---|---|
-1001 | The server could not process a Net.Data request to allocate memory. |
1001 | An input parameter contained a NULL value. |
1003 | An incorrect number of parameters were passed on a function call. |
1004 | A parameter passed on a function call, required to be a Net.Data macro table variable, was of a different variable type. |
1005 | A parameter passed on a function call, required to be a string variable, was of a different variable type. |
1006 | A literal string was passed on a function call for a parameter which was required to be an output parameter. |
1007 | A parameter contains a value which is not valid. |
1008 | A parameter is outside of table bounds. |
Usage Notes
Before calling DTW_TB_GETN(), set the number of columns in the table. You can set the number of columns with the DTW_TB_SETCOLS() or DTW_TB_INSERTCOL() functions, or by passing the table to a language environment to be set.
Examples
Example 1: Retrieves the column name of column 4
%DEFINE myTable = %TABLE %DEFINE name = "" ... @FillTable(myTable) ... @DTW_TB_GETN(myTable, "4", name)
Example 2: Retrieves the column name of the last column in the table
%DEFINE myTable = %TABLE ... @FillTable(myTable) ... <p>The column name of the last column is @DTW_TB_rGETN(myTable, @DTW_TB_rCOLS(myTable))</p>