SQLite3Result::columnType

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SQLite3Result::columnType — Devolver el tipo de la columna n-ésima

Descripción

public SQLite3Result::columnType(int $column_number): int

Devuelve el tipo de la columna identificada por column_number.

Parámetros

column_number: El índice numérico basado en cero de la columna.

Valores devueltos

Devuelve el índice del tipo de información de la columna identificada por column_number (uno de los siguientes: SQLITE3_INTEGER, SQLITE3_FLOAT, SQLITE3_TEXT, SQLITE3_BLOB, o SQLITE3_NULL).

Improve This Page

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 3 notes

down

phpnotes at carwash dot org ¶

12 years ago

This function never returns any value other than 5, indicating SQLITE3_NULL.  SQLite 3 doesn't have column types, it has column affinities.  Different rows of the same table (and rows resulting from a SELECT) can hold values of different types.  Therefore this API cannot return anything useful, and the method appears to be using SQLITE3_NULL as a placeholder. 

The function in useless and should be removed or marked as deprecated in future releases, so as not to give any programmer the false idea that the values returned are useful.

down

hairbysubaru at gmail dot com ¶

8 years ago

jean-marc is correct. SQLite determines column types dynamically based upon the returned record-set.

down

jean-marc at paratte dot ch ¶

10 years ago

To find the type of columns, you need to 'query' the SQL sentence, 'fetchArray' the 1rst row, and then extract the name and type of each column.

Example:

function _sqlite_fetch_all( $db, $sql ) {

    $sqlite = new SQLite3( $db);

    if( $sqlite->lastErrorCode() ) return;

    $result = $sqlite->query( $sql );

    $result->fetchArray( SQLITE3_NUM );
    $fieldnames = [];
    $fieldtypes = [];
    for( $colnum=0; $colnum<$result->numColumns(); $colnum++) {
        $fieldnames[] = $result->columnName($colnum);
        $fieldtypes[] = $result->columnType($colnum);
    }
    $result->reset();

    while( $row = $result->fetchArray( SQLITE3_NUM ) ) {

        for ($colnum=0; $colnum<count($row); $colnum++) {
            $col = &$row[$colnum];
            if (isset($fieldtype_encode_binary[$fieldtypes[$colnum]])) $col = $fieldtype_encode_binary[$fieldtypes[$colnum]]( $col );
        }
        unset($col);
        if ($resulttype == SQLITE3_ASSOC) $row = array_combine( $fieldnames, $row );
        $rows[] = $row;
    }

    $result->finalize();

    $sqlite->close();

    return $rows;
}

Remark 1: The type of a column is SQLITE3_NULL before any 'fetchArray' and 'false' after last fetched row.

Remark2 : The actual values of SQLITE3_INTEGER, SQLITE3_FLOAT, SQLITE3_TEXT, SQLITE3_BLOB, SQLITE3_NULL are 1, 2, 3, 4, 5.

＋add a note