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<?php
namespace Bitrix\Main\DB;
use Bitrix\Main;
use Bitrix\Main\Type;
use Bitrix\Main\ORM;
use Bitrix\Main\ORM\Fields\ScalarField;
abstract class MysqlCommonSqlHelper extends SqlHelper
{
/**
* Returns an identificator escaping left character.
*
* @return string
*/
public function getLeftQuote()
{
return '`';
}
/**
* Returns an identificator escaping right character.
*
* @return string
*/
public function getRightQuote()
{
return '`';
}
/**
* Returns maximum length of an alias in a select statement
*
* @return integer
*/
public function getAliasLength()
{
return 256;
}
/**
* Returns database specific query delimiter for batch processing.
*
* @return string
*/
public function getQueryDelimiter()
{
return ';';
}
/**
* Returns function for getting current time.
*
* @return string
*/
public function getCurrentDateTimeFunction()
{
return "NOW()";
}
/**
* Returns function for getting current date without time part.
*
* @return string
*/
public function getCurrentDateFunction()
{
return "CURDATE()";
}
/**
* Returns function for adding seconds time interval to $from.
* <p>
* If $from is null or omitted, then current time is used.
* <p>
* $seconds and $from parameters are SQL unsafe.
*
* @param integer $seconds How many seconds to add.
* @param integer $from Datetime database field of expression.
*
* @return string
*/
public function addSecondsToDateTime($seconds, $from = null)
{
if ($from === null)
{
$from = static::getCurrentDateTimeFunction();
}
return 'DATE_ADD('.$from.', INTERVAL '.$seconds.' SECOND)';
}
/**
* Returns function cast $value to datetime database type.
* <p>
* $value parameter is SQL unsafe.
*
* @param string $value Database field or expression to cast.
*
* @return string
*/
public function getDatetimeToDateFunction($value)
{
return 'DATE('.$value.')';
}
/**
* Returns database expression for converting $field value according the $format.
* <p>
* Following format parts converted:
* - YYYY A full numeric representation of a year, 4 digits
* - MMMM A full textual representation of a month, such as January or March
* - MM Numeric representation of a month, with leading zeros
* - MI Minutes with leading zeros
* - M A short textual representation of a month, three letters
* - DD Day of the month, 2 digits with leading zeros
* - HH 24-hour format of an hour with leading zeros
* - H 24-hour format of an hour without leading zeros
* - GG 12-hour format of an hour with leading zeros
* - G 12-hour format of an hour without leading zeros
* - SS Seconds with leading zeros
* - TT AM or PM
* - T AM or PM
* <p>
* $field parameter is SQL unsafe.
*
* @param string $format Format string.
* @param string $field Database field or expression.
*
* @return string
*/
public function formatDate($format, $field = null)
{
static $search = array(
"YYYY",
"MMMM",
"MM",
"MI",
"DD",
"HH",
"GG",
"G",
"SS",
"TT",
"T"
);
static $replace = array(
"%Y",
"%M",
"%m",
"%i",
"%d",
"%H",
"%h",
"%l",
"%s",
"%p",
"%p"
);
$format = str_replace($search, $replace, $format);
if (mb_strpos($format, '%H') === false)
{
$format = str_replace("H", "%h", $format);
}
if (mb_strpos($format, '%M') === false)
{
$format = str_replace("M", "%b", $format);
}
if($field === null)
{
return $format;
}
else
{
return "DATE_FORMAT(".$field.", '".$format."')";
}
}
/**
* Returns function for concatenating database fields or expressions.
* <p>
* All parameters are SQL unsafe.
*
* @param string $field,... Database fields or expressions.
*
* @return string
*/
public function getConcatFunction()
{
$str = "";
$ar = func_get_args();
if (is_array($ar))
$str .= implode(", ", $ar);
if ($str <> '')
$str = "CONCAT(".$str.")";
return $str;
}
/**
* Returns function for testing database field or expressions
* against NULL value. When it is NULL then $result will be returned.
* <p>
* All parameters are SQL unsafe.
*
* @param string $expression Database field or expression for NULL test.
* @param string $result Database field or expression to return when $expression is NULL.
*
* @return string
*/
public function getIsNullFunction($expression, $result)
{
return "IFNULL(".$expression.", ".$result.")";
}
/**
* Returns function for getting length of database field or expression.
* <p>
* $field parameter is SQL unsafe.
*
* @param string $field Database field or expression.
*
* @return string
*/
public function getLengthFunction($field)
{
return "LENGTH(".$field.")";
}
/**
* Returns function for converting string value into datetime.
* $value must be in YYYY-MM-DD HH:MI:SS format.
* <p>
* $value parameter is SQL unsafe.
*
* @param string $value String in YYYY-MM-DD HH:MI:SS format.
*
* @return string
* @see \Bitrix\Main\DB\MssqlSqlHelper::formatDate
*/
public function getCharToDateFunction($value)
{
return "'".$value."'";
}
/**
* Returns function for converting database field or expression into string.
* <p>
* Result string will be in YYYY-MM-DD HH:MI:SS format.
* <p>
* $fieldName parameter is SQL unsafe.
*
* @param string $fieldName Database field or expression.
*
* @return string
* @see \Bitrix\Main\DB\MssqlSqlHelper::formatDate
*/
public function getDateToCharFunction($fieldName)
{
return $fieldName;
}
/**
* Returns callback to be called for a field value on fetch.
* Used for soft conversion. For strict results @see Entity\Query\Result::setStrictValueConverters()
*
* @param ScalarField $field Type "source".
*
* @return false|callback
*/
public function getConverter(ScalarField $field)
{
if($field instanceof ORM\Fields\DatetimeField)
{
return array($this, "convertFromDbDateTime");
}
elseif($field instanceof ORM\Fields\DateField)
{
return array($this, "convertFromDbDate");
}
else
{
return parent::getConverter($field);
}
}
/**
* @deprecated
* Converts string into \Bitrix\Main\Type\DateTime object.
* <p>
* Helper function.
*
* @param string $value Value fetched.
*
* @return null|\Bitrix\Main\Type\DateTime
* @see \Bitrix\Main\Db\MysqlCommonSqlHelper::getConverter
*/
public function convertDatetimeField($value)
{
return $this->convertFromDbDateTime($value);
}
/**
* @param $value
*
* @return Type\DateTime|null
* @throws Main\ObjectException
*/
public function convertFromDbDateTime($value)
{
if($value !== null && $value != '0000-00-00 00:00:00')
{
return new Type\DateTime($value, "Y-m-d H:i:s");
}
return null;
}
/**
* @deprecated
* Converts string into \Bitrix\Main\Type\Date object.
* <p>
* Helper function.
*
* @param string $value Value fetched.
*
* @return null|\Bitrix\Main\Type\Date
* @see \Bitrix\Main\Db\MysqlCommonSqlHelper::getConverter
*/
public function convertDateField($value)
{
return $this->convertFromDbDate($value);
}
/**
* @param $value
*
* @return Type\Date|null
* @throws Main\ObjectException
*/
public function convertFromDbDate($value)
{
if($value !== null && $value != '0000-00-00')
{
return new Type\Date($value, "Y-m-d");
}
return null;
}
/**
* {@inheritDoc}
*
* @param string $fieldName
*
* return string
*/
public function castToChar($fieldName)
{
return 'CAST('.$fieldName.' AS char)';
}
/**
* {@inheritDoc}
*
* @param string $fieldName
*
* return string
*/
public function softCastTextToChar($fieldName)
{
return $fieldName;
}
/**
* Returns a column type according to ScalarField object.
*
* @param ScalarField $field Type "source".
*
* @return string
*/
public function getColumnTypeByField(ScalarField $field)
{
if ($field instanceof ORM\Fields\IntegerField)
{
return 'int';
}
elseif ($field instanceof ORM\Fields\DecimalField)
{
$defaultPrecision = 18;
$defaultScale = 2;
$precision = $field->getPrecision() > 0 ? $field->getPrecision() : $defaultPrecision;
$scale = $field->getScale() > 0 ? $field->getScale() : $defaultScale;
if ($scale >= $precision)
{
$precision = $defaultPrecision;
$scale = $defaultScale;
}
return "decimal($precision, $scale)";
}
elseif ($field instanceof ORM\Fields\FloatField)
{
return 'double';
}
elseif ($field instanceof ORM\Fields\DatetimeField)
{
return 'datetime';
}
elseif ($field instanceof ORM\Fields\DateField)
{
return 'date';
}
elseif ($field instanceof ORM\Fields\TextField)
{
return 'text';
}
elseif ($field instanceof ORM\Fields\BooleanField)
{
$values = $field->getValues();
if (preg_match('/^[0-9]+$/', $values[0]) && preg_match('/^[0-9]+$/', $values[1]))
{
return 'int';
}
else
{
return 'varchar('.max(mb_strlen($values[0]), mb_strlen($values[1])).')';
}
}
elseif ($field instanceof ORM\Fields\EnumField)
{
return 'varchar('.max(array_map('strlen', $field->getValues())).')';
}
else
{
// string by default
$defaultLength = false;
foreach ($field->getValidators() as $validator)
{
if ($validator instanceof ORM\Fields\Validators\LengthValidator)
{
if ($defaultLength === false || $defaultLength > $validator->getMax())
{
$defaultLength = $validator->getMax();
}
}
}
return 'varchar('.($defaultLength > 0? $defaultLength: 255).')';
}
}
/**
* Transforms Sql according to $limit and $offset limitations.
* <p>
* You must specify $limit when $offset is set.
*
* @param string $sql Sql text.
* @param integer $limit Maximum number of rows to return.
* @param integer $offset Offset of the first row to return, starting from 0.
*
* @return string
* @throws Main\ArgumentException
*/
public function getTopSql($sql, $limit, $offset = 0)
{
$offset = intval($offset);
$limit = intval($limit);
if ($offset > 0 && $limit <= 0)
throw new \Bitrix\Main\ArgumentException("Limit must be set if offset is set");
if ($limit > 0)
{
$sql .= "\nLIMIT ".$offset.", ".$limit."\n";
}
return $sql;
}
/**
* Builds the strings for the SQL MERGE command for the given table.
*
* @param string $tableName A table name.
* @param array $primaryFields Array("column")[] Primary key columns list.
* @param array $insertFields Array("column" => $value)[] What to insert.
* @param array $updateFields Array("column" => $value)[] How to update.
*
* @return array (merge)
*/
public function prepareMerge($tableName, array $primaryFields, array $insertFields, array $updateFields)
{
$insert = $this->prepareInsert($tableName, $insertFields);
$update = $this->prepareUpdate($tableName, $updateFields);
if (
$insert && $insert[0] != "" && $insert[1] != ""
&& $update && $update[1] != ""
)
{
$sql = "
INSERT INTO ".$this->quote($tableName)." (".$insert[0].")
VALUES (".$insert[1].")
ON DUPLICATE KEY UPDATE ".$update[0]."
";
}
else
{
$sql = "";
}
return array(
$sql
);
}
}