<?php
/**
* SlimDb
*
* Provides a database wrapper around the PDO and PDO statement that
* help to reduce the effort to interact with a database.
*
* @author Marcelo Entraigas <entraigas@gmail.com>
* @license MIT
* @filesource
*
*/
/**
* Custom methods for MySQL databases
*/
return array(
// Initialize default driver settings after Database contructor
'init' => function($index){
// MySQL uses a non-standard column identifier
self::wrapper($index, '`%s`');
},
// Build a limit clause
'limit' => function( $index, $offset = 0, $limit = 0 ){
$offset = (int) $offset;
$limit = (int) $limit;
if( $offset==0 && $limit==0 )
throw new \Exception("Database Error: invalid parameters in query (offset={$offset} - limit= {$limit} - driver {$db->type}).");
if( $offset<0 )
throw new \Exception("Database Error: invalid <offset> parameter in query (offset={$offset} - driver {$db->type}).");
if( $limit<0 )
throw new \Exception("Database Error: missing <limit> parameter in query (limit= {$limit} - driver {$db->type}).");
if( $offset>0 && $limit>0 )
return " LIMIT {$offset}, {$limit}";
if( $offset==0 && $limit>0 )
return " LIMIT {$limit}";
},
// Run this code right after PDO connection (setup default charset)
'connect' => function ($index, $config){
// If a character set has been specified
if (isset($config['charset'])){
self::query($index, "SET NAMES '{$config['charset']}'");
}
},
// List all tables from database
'schemaDb' => function ($index){
$tables = self::query($index, "SHOW TABLES")->getAll();
$data = array();
foreach($tables as $item){
$data[] = (string) array_shift(array_values($item));
}
return $data;
},
// List all fields from table (describe table structure)
'schemaTable' => function ($index, $table){
$retval = array();
$type = self::getConfigDriver($index);
$table = self::quote($index, $table);
$raw_data = self::query($index, "DESCRIBE {$table}")->getAll();
foreach($raw_data as $item)
{
$row = array();
$row['TABLE'] = trim($table,'`');
$row['FIELD'] = $item['Field'];
$row['TYPE'] = $item['Type'];
if(stristr ($item['Type'],'int')){
$row['TYPE'] = 'integer';
} elseif(stristr ($item['Type'],'enum')) {
$row['TYPE'] = 'string';
$row['VALUES'] = self::driverCall($type, 'parse_enum', $item['Type']);
} elseif(preg_match('[decimal|float|double]',$item['Type'])){
$row['TYPE'] = 'float';
} elseif(preg_match('[var|char|text]',$item['Type'])){
$row['TYPE'] = 'string';
if( preg_match('@\((.+)\)@',$item['Type'], $tmp) )
$row['LENGTH'] = isset($tmp[1])? $tmp[1] : NULL;
}
$row['DEFAULT'] = $item['Default'];
$row['PRIMARY'] = ($item['Key']==="PRI")? true : false;
$row['NULLABLE'] = ($item['Null']==='YES')? true : false;
$row['UNSIGNED'] = strpos($item['Type'],'unsigned')? true : false;
$row['IDENTITY'] = stristr($item['Extra'],'AUTO_INCREMENT')? true : false;
$retval[] = $row;
}
return $retval;
},
// Nasty function that parse enum values
'parseEnum' => function($text){
preg_match('/^enum\((.*)\)$/',$text, $tmp);
$tmp = str_replace("'",'',$tmp[1]);
return explode(',', $tmp);
},
// Return query num rows
'numRows' => function ($index, $sql, $params){
$sql_count = "SELECT count(*) FROM ({$sql}) AS tmp";
return (int) self::query($index, $sql_count, $params)->getVal();
}
);
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