README

DB helpers to complement phlib/db

Installation

composer require phlib/db-helper

Usage

// Get an Adapter
$config = [
    'host' => 'localhost',
    'username' => 'myuser',
    'password' => 'mypassword',
    'dbname' => 'mydatabase'
];
$db = new \Phlib\Db\Adapter($config);

BulkInsert

Insert and/or update many rows into a table.

This increases the write performance for adding large numbers (eg. thousands+) of rows, over the typical pseudo-prepared statements used by native PDO.

$insertFields = [
    'product_id',
    'product_name',
    'product_qty'
];
$updateFields = [
    'product_name',
    'product_qty'
];
$bulkInsert = new BulkInsert($adapter, 'product', $insertFields, $updateFields);

// Many calls to add() will write to the DB in batches
$bulkInsert->add($singleProductData);

// One final manual call to write() to complete
$bulkInsert->write();

QueryPlanner

Test the number of rows that a SELECT statement will query.

$queryPlanner = new QueryPlanner($adapter, $sqlSelect);
$queryPlanner->getNumberOfRowsInspected(); // eg. 46234

BigResult

Run a SELECT statement which is expected to be slow (eg. >5s) due to quantity of data.

Query buffering is disabled to reduce the time to first row and avoid consuming PHP's memory for the statement result, and MySQL's query timeout is increased.

$bigResult = new BigResult($adapter);
$pdoStmt = $bigResult->query($sqlSelect, $bind);

Optionally, prevent very large queries from running by using the QueryPlanner inspection:

$bigResult = new BigResult($adapter);
$queryRowLimit = 20000000;
$pdoStmt = $bigResult->query($sqlSelect, $bind, $queryRowLimit);

License

This package is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this program. If not, see http://www.gnu.org/licenses/.

phlib / db-helper

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