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Fetching Rows

Oracle Tips by Burleson Consulting

So far, the details about connect, connect options and handling errors have been described with data fetches present in the examples. The methods to fetch data are a part of the result set class. As expected the fetching mechanism in PEAR DB is based on or similar to the one in OCI8. The methods used to fetch data from the result set are called fetchInto() and fetchRow(). The syntax for the fetchInto(), taken directly from the online manual, is shown as follows:

DB_result::fetchInto()--Fetches a row of a result set into a variable


integer fetchInto (array &$arr [, integer $fetchMode = DB_FETCHMODE_DEFAULT [, integer $rowNum = NULL]])


Places a row of data from a result set into the variable provided and moves the result pointer to the next row. The data can be formatted as an array or as an object.


mixed $arr

Contains a reference to a variable to contain the row integer $fetchMode which is the fetch mode to use. The default is DB_FETCHMODE_DEFAULT, which tells this method to use database's current fetch mode. The database's current default fetch mode can be changed using setFetchMode(). Potential values include:




Integer $rowNum is the row number to fetch the integer - DB_OK if a row is processed, NULL when the end of the result set is reached or a DB_Error object on failure.

The fetchRow() method is identical in all aspects to the fetchInto(), except the fetchRow() method creates a new array to hold the resulting row, while the fetchinto() method fetches into the already existing one.  Fetching modes are the same as in the OCI8 module; associative array, array indexed by numbers and fetching an object. In contrast to OCI8, which fetches rows and organizes them as both associative array and array ordered by numbers, PEAR DB fetches from Oracle databases in the DB_FETCHMODE_ORDERED mode by default. 

Fetching can be performed from different result sets in different modes.  This is accomplished by specifying the mode argument with each call to the fetch method, and in rare occasions, the default mode can be set for the entire session.

The syntax is simple and expected as follows:

    $db->setFetchMode( int mode);

The mode is, of course, one of the modes documented for the fetchInto() method.


The above book excerpt is from  "Easy Oracle PHP: Creating Dynamic Web Pages with Oracle Data". 

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