Difference between revisions of "FETCH"
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==See Also== | ==See Also== | ||
| − | [[DECLARE CURSOR]], [[DROP CURSOR]], [[OPEN]], [[SQL SELECT|SELECT]] | + | [[SQL CLOSE|CLOSE]], [[DECLARE CURSOR]], [[DROP CURSOR]], [[OPEN]], [[SQL SELECT|SELECT]], [[SET XMLFORMAT]] |
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// Declare the cursor to retrieve records from the accounts table | // Declare the cursor to retrieve records from the accounts table | ||
EXEC SQL | EXEC SQL | ||
| − | DECLARE accounts CURSOR FOR | + | DECLARE accounts CURSOR FOR |
| − | SELECT name, address, ord_value, balance | + | SELECT name, address, ord_value, balance |
| − | FROM accounts | + | FROM accounts |
| − | ORDER BY name; | + | ORDER BY name; |
// Open the cursor and establish a temporary set of records | // Open the cursor and establish a temporary set of records | ||
EXEC SQL | EXEC SQL | ||
| − | OPEN accounts; | + | OPEN accounts; |
// Retrieve each row from open cursor | // Retrieve each row from open cursor | ||
DO WHILE sqlcode = 0 | DO WHILE sqlcode = 0 | ||
| − | EXEC SQL | + | EXEC SQL |
| − | FETCH NEXT accounts | + | FETCH NEXT accounts |
| − | INTO m_name, m_address, m_ord_value, m_balance; | + | INTO m_name, m_address, m_ord_value, m_balance; |
ENDDO | ENDDO | ||
// Close the cursor | // Close the cursor | ||
EXEC SQL | EXEC SQL | ||
| − | CLOSE accounts; | + | CLOSE accounts; |
// Free up any resources used for the cursor | // Free up any resources used for the cursor | ||
EXEC SQL | EXEC SQL | ||
| − | DROP CURSOR accounts; | + | DROP CURSOR accounts; |
</code> | </code> | ||
Revision as of 10:56, 29 April 2009
Contents
FETCH
Class
SQL Applications
Purpose
Fetches rows returned by the SELECT statement defined in a CURSOR
Syntax
FETCH
[NEXT | PREVIOUS | FIRST | LAST | ABSOLUTE <row position> | CURRENT | RELATIVE <row position>] <cursor>
INTO [ [, ...] | XML <xml filename>]
See Also
CLOSE, DECLARE CURSOR, DROP CURSOR, OPEN, SELECT, SET XMLFORMAT
Description
The FETCH command fetches rows returned by the SELECT statement defined in a CURSOR. It reads the values in the specified row from the open cursor and places them in the bound data variables. If the variables do not exist, they are created. If they do exist, they are updated. The cursor must have already been opened with the OPEN statement.
| Keywords | Description |
|---|---|
| NEXT | Retrieves the next row from the open cursor. This is the default if no direction is specified. |
| PREVIOUS | Retrieves the previous row from the open cursor. |
| FIRST | Retrieves the first row from the open cursor. |
| LAST | Retrieves the last row from the open cursor. |
| ABSOLUTE row position | Retrieves the absolute row position. Row positions start at 1 in the open cursor. |
| CURRENT | Retrieves the current row from the open cursor. |
| RELATIVE row position | Retrieves the row position relative to the current cursor position. The row position can be negative to move to previous rows, positive to move to next rows and zero to retrieve the current row. |
| cursor | The cursor that has been declared with the DECLARE CURSOR statement. |
| INTO data variable | Specifies a list of data variables to receive the extracted row values. The list may contain fewer variables than there are table columns, but may not contain more variables than there are table columns. |
| INTO XML <xml filename> | Specify the name of an XML file that will be created and populated with all the rows from the open cursor. |
Example
// Declare the cursor to retrieve records from the accounts table EXEC SQL DECLARE accounts CURSOR FOR SELECT name, address, ord_value, balance FROM accounts ORDER BY name; // Open the cursor and establish a temporary set of records EXEC SQL OPEN accounts; // Retrieve each row from open cursor DO WHILE sqlcode = 0 EXEC SQL FETCH NEXT accounts INTO m_name, m_address, m_ord_value, m_balance; ENDDO // Close the cursor EXEC SQL CLOSE accounts; // Free up any resources used for the cursor EXEC SQL DROP CURSOR accounts;
Products
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
