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Table functions

The table functions return information about the data table which is currently being read. If no table name is specified and the function is used within a LOAD statement, the current table is assumed.

FieldName

The FieldName script function returns the name of the field with the specified number within a previously loaded table. If the function is used within a LOAD statement, it must not reference the table currently being loaded.

FieldName(field_number, table_name)

Argument Description
field_number The field number of the field you want to reference.
table_name The table containing the field you want to reference.

Example:

LET a = FieldName(4,'tab1');

FieldNumber

The FieldNumber script function returns the number of a specified field within a previously loaded table. If the function is used within a LOAD statement, it must not reference the table currently being loaded.

FieldNumber(field_name, table_name)

Argument Description
field_name The name of the field.
table_name The name of the table containing the field.

If the field field_name does not exist in table_name, or table_name does not exist, the function returns 0. Example:

LET a = FieldNumber('Customer','tab1');

NoOfFields

The NoOfFields script function returns the number of fields in a previously loaded table. If the function is used within a LOAD statement, it must not reference the table currently being loaded.

NoOfFields(table_name)

Argument Description
table_name The name of the table.

Example:

LET a = NoOfFields('tab1');

NoOfRows

The NoOfRows function returns the number of rows (records) in a previously loaded table. If the function is used within a LOAD statement, it must not reference the table currently being loaded.

NoOfRows(table_name)

Argument Description
table_name The name of the table.

Example!:

LET a = NoOfRows('tab1');

NoOfTables

This script function returns the number of tables previously loaded.

NoOfTables()

TableName

This script function returns the name of the table with the specified number.

TableName(table_number)

TableNumber

This script function returns the number of the specified table. The first table has number 0.

If table_name does not exist, NULL is returned.

TableNumber(table_name)

In this example, we want to create a table with information about the tables and fields that have been loaded.

First we load some sample data. This creates the two tables that will be used to illustrate the table functions described in this section.

Characters:
Load Chr(RecNo()+Ord('A')-1) as Alpha, RecNo() as Num
autogenerate 26;

ASCII:
Load if(RecNo()\>=65 and
  RecNo()\<=90,RecNo()-64) as Num,
  Chr(RecNo()) as AsciiAlpha,
  RecNo() as AsciiNum
autogenerate 255
  Where (RecNo()\>=32 and RecNo()\<=126) or RecNo()\>=160;

Next, we iterate through the tables that have been loaded, using the NoOfTables function, and then through the fields of each table, using the NoOfFields function, and load information using the table functions.

// Iterate through the loaded tables
For t = 0 to NoOfTables() - 1

// Iterate through the fields of table
For f = 1 to NoOfFields(TableName($(t)))
  Tables:
  Load
    TableName($(t)) as Table,
    TableNumber(TableName($(t))) as TableNo,
    NoOfRows(TableName($(t))) as TableRows,
    FieldName($(f),TableName($(t))) as Field,
    FieldNumber(FieldName($(f), TableName($(t))), TableName($(t))) as FieldNo
    Autogenerate 1;
  Next f
Next t;

The resulting table Tables will look like this:

Table TableNo TableRows Field FieldNo
Characters 0 26 Alpha 1
Characters 0 26 Num 2
ASCII 1 191 Num 1
ASCII 1 191 AsciiAlpha 2
ASCII 1 191 AsciiNum 3
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