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<?php |
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declare(strict_types=1); |
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/** |
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* Database Access Layer. |
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* @author Doug Wright |
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*/ |
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namespace DVDoug\DB; |
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/** |
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* PDO-backed database connection (common parts). |
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* @author Doug Wright |
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*/ |
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abstract class PDODatabase extends \PDO implements DatabaseInterface |
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{ |
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/** |
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* Character to use when quoting identifiers. |
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*/ |
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public const IDENTIFIER_OPENQUOTE = '"'; |
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/** |
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* Character to use when quoting identifiers. |
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*/ |
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public const IDENTIFIER_CLOSEQUOTE = '"'; |
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/** |
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* Constructor. |
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* @param string $aDSN |
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* @param string $aUsername |
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* @param string $aPassword |
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*/ |
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public function __construct($aDSN, $aUsername, $aPassword, array $aDriverOptions = null) |
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{ |
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parent::__construct($aDSN, $aUsername, $aPassword, $aDriverOptions); |
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self::setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION); |
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self::setAttribute(\PDO::ATTR_STATEMENT_CLASS, ['\DVDoug\DB\PDOStatement']); |
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} |
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/** |
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* Executes an SQL statement, returning the result set if any as a StatementInterface object. |
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* @param string $aSQL the SQL statement to execute |
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* @return StatementInterface|bool |
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*/ |
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public function query($aSQL) |
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{ |
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return parent::query($aSQL); |
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} |
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/** |
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* Returns the ID of the last inserted row or sequence value. |
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* @param string $aName name of the sequence object (if any) from which the ID should be returned |
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* @return string |
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*/ |
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public function getLastInsertId($aName = null) |
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{ |
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return parent::lastInsertID($aName); |
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} |
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/** |
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* Escapes/quotes a parameter for use in a query. |
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* |
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* @param mixed $aParam the parameter to be quoted |
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* @param int $aParamType data type hint for drivers |
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* |
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* @throws \RuntimeException |
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* @return string a quoted string that is theoretically safe to pass into an SQL statement |
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*/ |
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public function escape($aParam, $aParamType = DatabaseInterface::PARAM_IS_STR) |
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{ |
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switch ($aParamType) { |
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case self::PARAM_IS_INT: |
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if (is_int($aParam) || ctype_digit($aParam)) { |
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return (int) $aParam; |
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} else { |
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throw new \RuntimeException("Parameter {$aParam} is not an integer"); |
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} |
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break; |
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default: |
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return parent::quote($aParam, $aParamType); |
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} |
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} |
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/** |
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* Adds appropriate quotes to an identifier so it can be safely used in an SQL statement. |
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* @param mixed $aIdentifier the parameter to be quoted |
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* @return string |
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*/ |
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public function quoteIdentifier($aIdentifier) |
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{ |
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return static::IDENTIFIER_OPENQUOTE . $aIdentifier . static::IDENTIFIER_CLOSEQUOTE; |
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} |
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/** |
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* Get MySQL table definition. |
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* @param string $aDatabase database/schema name |
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* @param string $aTable table name |
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* @param bool $aSkipUnusedCols whether to skip unused columns |
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* @return string |
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*/ |
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public function getMySQLTableDef($aDatabase, $aTable, $aSkipUnusedCols = true) |
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{ |
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$table = strtolower($aTable); |
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$columns = $this->getTableColumns($aDatabase, $aTable); |
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$colDefs = []; |
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foreach ($columns as $columnName => $column) { |
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if ($aSkipUnusedCols && $column->getDistinctValueCount() <= 1) { |
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unset($columns[$columnName]); |
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continue; |
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} |
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$colDefs[] = $column->getMySQLColumnDef(); |
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} |
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$primaryKey = $this->getPrimaryKey($aDatabase, $aTable); |
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$indexes = $this->getIndexes($aDatabase, $aTable); |
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$tableDef = "CREATE TABLE `{$table}` (" . "\n"; |
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$tableDef .= implode(',' . "\n", $colDefs); |
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if ($primaryKey) { |
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$length = 0; |
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foreach ($primaryKey as $primaryCol) { |
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$length += $columns[$primaryCol]->getLength(); |
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} |
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if ($length <= 191) { //skip index if too long for MySQL |
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$tableDef .= ',' . "\n" . "\n"; |
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$tableDef .= 'PRIMARY KEY ('; |
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$tableDef .= implode(', ' . "\n", array_map(function ($c) {return '`' . strtolower($c) . '`'; }, $primaryKey)); |
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$tableDef .= ')'; |
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} |
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} |
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if ($indexes) { |
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foreach ($indexes as $indexName => $indexColumns) { |
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$length = 0; |
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foreach ($indexColumns as &$col) { |
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if (!in_array($col, array_keys($columns))) { //skip index if it includes a skipped column |
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continue 2; |
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} |
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$length += $columns[$col]->getLength(); |
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if ($length > 191) { //skip index if too long for MySQL |
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continue 2; |
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} |
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if (preg_match('/(BLOB|TEXT)$/', $columns[$col]->getMySQLType())) { |
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continue 2; |
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} |
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} |
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$tableDef .= ',' . "\n"; |
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$tableDef .= 'KEY `' . strtolower($indexName) . '` ('; |
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$tableDef .= implode(', ', array_map(function ($c) {return '`' . strtolower($c) . '`'; }, $indexColumns)); |
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$tableDef .= ')'; |
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} |
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} |
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$tableDef .= ') ENGINE=InnoDB ROW_FORMAT=COMPRESSED'; |
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return $tableDef; |
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} |
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/** |
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* Get Oracle table definition. |
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* @param string $aDatabase database/schema name |
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* @param string $aTable table name |
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* @param bool $aSkipUnusedCols whether to skip unused columns |
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* @return string |
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*/ |
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public function getOracleTableDef($aDatabase, $aTable, $aSkipUnusedCols = true) |
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{ |
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$table = strtolower($aTable); |
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$columns = $this->getTableColumns($aDatabase, $aTable); |
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$colDefs = []; |
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foreach ($columns as $columnName => $column) { |
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if ($aSkipUnusedCols && $column->getDistinctValueCount() <= 1) { |
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unset($columns[$columnName]); |
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continue; |
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} |
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$colDefs[] = $column->getOracleColumnDef(); |
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} |
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$primaryKey = $this->getPrimaryKey($aDatabase, $aTable); |
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$indexes = $this->getIndexes($aDatabase, $aTable); |
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$tableDef = "CREATE TABLE `{$table}` (" . "\n"; |
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$tableDef .= implode(',' . "\n", $colDefs); |
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if ($primaryKey) { |
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$tableDef .= ',' . "\n" . "\n"; |
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$tableDef .= 'PRIMARY KEY ('; |
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$tableDef .= implode(', ' . "\n", array_map(function ($c) {return '"' . strtolower($c) . '"'; }, $primaryKey)); |
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$tableDef .= ')'; |
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} |
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if ($indexes) { |
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foreach ($indexes as $indexName => $indexColumns) { |
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foreach ($indexColumns as &$col) { |
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if (!in_array($col, array_keys($columns))) { //skip index if it includes a skipped column |
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continue 2; |
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} |
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} |
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$tableDef .= ',' . "\n"; |
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$tableDef .= 'KEY `' . strtolower($indexName) . '` ('; |
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$tableDef .= implode(', ', array_map(function ($c) {return '"' . strtolower($c) . '"'; }, $indexColumns)); |
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$tableDef .= ')'; |
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} |
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} |
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$tableDef .= ')'; |
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return $tableDef; |
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} |
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} |
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dvdoug /
DB
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