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<?php
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namespace yii\db\oci;
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use yii\db\TableSchema;
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use yii\db\oci\ColumnSchema;
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/**
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* Schema is the class for retrieving metadata information from an Oracle database.
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*
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*/
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class Schema extends \yii\db\Schema
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{
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private $_defaultSchema = '';
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public function createQueryBuilder()
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{
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return new QueryBuilder($this->db);
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}
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public function quoteTableName($name)
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{
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if (strpos($name, '.') === false) {
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return $this->quoteSimpleTableName($name);
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}
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$parts = explode('.', $name);
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foreach ($parts as $i => $part) {
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$parts[$i] = $this->quoteSimpleTableName($part);
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}
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return implode('.', $parts);
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}
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public function quoteSimpleTableName($name)
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{
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return '"' . $name . '"';
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// return $name;
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}
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public function quoteColumnName($name)
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{
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if (($pos = strrpos($name, '.')) !== false) {
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$prefix = $this->quoteTableName(substr($name, 0, $pos)) . '.';
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$name = substr($name, $pos + 1);
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} else {
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$prefix = '';
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}
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return $prefix . ($name === '*' ? $name : $this->quoteSimpleColumnName($name));
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}
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public function quoteSimpleColumnName($name)
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{
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return '"' . $name . '"';
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// return $name;
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}
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public function loadTableSchema($name)
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{
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$table = new TableSchema();
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$this->resolveTableNames($table, $name);
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// $this->findPrimaryKeys($table);
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if ($this->findColumns($table)) {
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// $this->findForeignKeys($table);
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$this->findConstraints($table);
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return $table;
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}
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}
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/**
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* Resolves the table name and schema name (if any).
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*
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* @param TableSchema $table
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* the table metadata object
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* @param string $name
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* the table name
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*/
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protected function resolveTableNames($table, $name)
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{
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$parts = explode('.', str_replace('"', '', $name));
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if (isset($parts[1])) {
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$table->schemaName = $parts[0];
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$table->name = $parts[1];
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} else {
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$table->name = $parts[0];
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}
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if ($table->schemaName === null) {
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$table->schemaName = $this->getDefaultSchema();
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}
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}
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/**
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*
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* @return string default schema.
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*/
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public function getDefaultSchema()
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{
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if (! strlen($this->_defaultSchema)) {
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$this->setDefaultSchema(strtoupper($this->db->username));
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}
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return $this->_defaultSchema;
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}
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/**
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*
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* @param string $schema
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* default schema.
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*/
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public function setDefaultSchema($schema)
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{
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$this->_defaultSchema = $schema;
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}
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public function getLastInsertID($sequenceName = '')
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{
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if ($this->db->isActive) {
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$sql = "select {$sequenceName}.currval from dual";
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return $this->db->createCommand($sql)->queryScalar();
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} else {
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throw new InvalidCallException('DB Connection is not active.');
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}
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}
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/**
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* Collects the table column metadata.
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*
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*/
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protected function findColumns($table)
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{
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$schemaName = $table->schemaName;
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$tableName = $table->name;
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$sql = <<<EOD
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SELECT a.column_name, a.data_type ||
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case
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when data_precision is not null
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then '(' || a.data_precision ||
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case when a.data_scale > 0 then ',' || a.data_scale else '' end
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|| ')'
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when data_type = 'DATE' then ''
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when data_type = 'NUMBER' then ''
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else '(' || to_char(a.data_length) || ')'
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end as data_type,
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a.nullable, a.data_default,
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( SELECT D.constraint_type
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FROM ALL_CONS_COLUMNS C
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inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
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WHERE C.OWNER = B.OWNER
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and C.table_name = B.object_name
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and C.column_name = A.column_name
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and D.constraint_type = 'P') as Key,
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com.comments as column_comment
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FROM ALL_TAB_COLUMNS A
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inner join ALL_OBJECTS B ON b.owner = a.owner and ltrim(B.OBJECT_NAME) = ltrim(A.TABLE_NAME)
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LEFT JOIN user_col_comments com ON (A.table_name = com.table_name AND A.column_name = com.column_name)
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WHERE
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a.owner = '{$schemaName}'
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and (b.object_type = 'TABLE' or b.object_type = 'VIEW')
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and b.object_name = '{$tableName}'
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ORDER by a.column_id
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EOD;
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try {
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$columns = $this->db->createCommand($sql)->queryAll();
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} catch (\Exception $e) {
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return false;
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}
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foreach ($columns as $column) {
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$c = $this->createColumn($column);
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$table->columns[$c->name] = $c;
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if ($c->isPrimaryKey) {
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if ($table->primaryKey === null) {
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$table->primaryKey = $c->name;
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} elseif (is_string($table->primaryKey)) {
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$table->primaryKey = array(
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$table->primaryKey,
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$c->name
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);
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} else {
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$table->primaryKey[] = $c->name;
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}
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$sql = "select sequence_name
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from user_tables tabs
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join user_triggers trigs
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on trigs.table_name = tabs.table_name
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join user_dependencies deps
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on deps.name = trigs.trigger_name
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join user_sequences seqs
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on seqs.sequence_name = deps.referenced_name
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where tabs.table_name = '{$tableName}'
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and trigs.triggering_event = 'INSERT'";
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try {
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$seqName = $this->db->createCommand($sql)->queryScalar();
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} catch (\Exception $e) {
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return false;
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}
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$table->sequenceName = $seqName;
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$c->autoIncrement = true;
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}
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}
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return true;
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}
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protected function createColumn($column)
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{
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$c = new ColumnSchema();
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$c->name = $column['COLUMN_NAME'];
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$c->allowNull = $column['NULLABLE'] === 'Y';
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$c->isPrimaryKey = strpos($column['KEY'], 'P') !== false;
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$c->extract($column['DATA_TYPE'], $column['DATA_DEFAULT']);
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$c->comment = $column['COLUMN_COMMENT'] === null ? '' : $column['COLUMN_COMMENT'];
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return $c;
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}
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protected function findConstraints($table)
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{
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$sql = <<<EOD
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SELECT D.constraint_type as CONSTRAINT_TYPE, C.COLUMN_NAME, C.position, D.r_constraint_name,
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E.table_name as table_ref, f.column_name as column_ref,
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C.table_name
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FROM ALL_CONS_COLUMNS C
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inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
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left join ALL_constraints E on E.OWNER = D.r_OWNER and E.constraint_name = D.r_constraint_name
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left join ALL_cons_columns F on F.OWNER = E.OWNER and F.constraint_name = E.constraint_name and F.position = c.position
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WHERE C.OWNER = '{$table->schemaName}'
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and C.table_name = '{$table->name}'
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and D.constraint_type <> 'P'
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order by d.constraint_name, c.position
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EOD;
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$command = $this->db->createCommand($sql);
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foreach ($command->queryAll() as $row) {
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if ($row['CONSTRAINT_TYPE'] === 'R') { // foreign key
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$name = $row["COLUMN_NAME"];
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$table->foreignKeys[$name] = array(
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$row["TABLE_REF"],
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$row["COLUMN_REF"]
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);
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/*
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* if (isset($table->columns[$name])) { $table->columns[$name]->isForeignKey = true; }
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*/
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}
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}
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}
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/**
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* Returns all table names in the database.
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*
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* @param string $schema
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* the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @return array all table names in the database.
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*/
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protected function findTableNames($schema = '')
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{
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if ($schema === '') {
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$sql = <<<EOD
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SELECT table_name, '{$schema}' as table_schema FROM user_tables
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EOD;
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$command = $this->db->createCommand($sql);
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} else {
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$sql = <<<EOD
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SELECT object_name as table_name, owner as table_schema FROM all_objects
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WHERE object_type = 'TABLE' AND owner=:schema
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EOD;
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$command = $this->db > createCommand($sql);
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$command->bindParam(':schema', $schema);
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}
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$rows = $command->queryAll();
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$names = array();
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foreach ($rows as $row) {
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if ($schema === $this->getDefaultSchema() || $schema === '') {
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$names[] = $row['TABLE_NAME'];
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} else {
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$names[] = $row['TABLE_SCHEMA'] . '.' . $row['TABLE_NAME'];
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}
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}
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return $names;
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}
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/**
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* Builds a SQL statement for renaming a DB table.
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*
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* @param string $table
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* the table to be renamed. The name will be properly quoted by the method.
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* @param string $newName
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* the new table name. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB table.
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* @since 1.1.6
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*/
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public function renameTable($table, $newName)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table) . ' RENAME TO ' . $this->quoteTableName($newName);
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}
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/**
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* Builds a SQL statement for changing the definition of a column.
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*
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* @param string $table
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* the table whose column is to be changed. The table name will be properly quoted by the method.
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* @param string $column
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* the name of the column to be changed. The name will be properly quoted by the method.
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* @param string $type
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* the new column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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* @return string the SQL statement for changing the definition of a column.
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* @since 1.1.6
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*/
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public function alterColumn($table, $column, $type)
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{
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$type = $this->getColumnType($type);
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$sql = 'ALTER TABLE ' . $this->quoteTableName($table) . ' MODIFY ' . $this->quoteColumnName($column) . ' ' . $this->getColumnType($type);
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return $sql;
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}
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/**
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* Builds a SQL statement for dropping an index.
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*
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* @param string $name
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* the name of the index to be dropped. The name will be properly quoted by the method.
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* @param string $table
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* the table whose index is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping an index.
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* @since 1.1.6
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*/
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public function dropIndex($name, $table)
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{
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return 'DROP INDEX ' . $this->quoteTableName($name);
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}
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/**
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* Resets the sequence value of a table's primary key.
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* The sequence will be reset such that the primary key of the next new row inserted
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* will have the specified value or 1.
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*
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* @param CDbTableSchema $table
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* the table schema whose primary key sequence will be reset
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* @param mixed $value
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* the value for the primary key of the next new row inserted. If this is not set,
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* the next new row's primary key will have a value 1.
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* @since 1.1.13
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*/
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public function resetSequence($table, $value = 1)
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{
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$seq = $table->name . "_SEQ";
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if ($table->sequenceName !== null) {
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$this->db->createCommand("DROP SEQUENCE " . $seq)->execute();
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$createSequenceSql = <<< SQL
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create sequence $seq
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start with $value
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increment by 1
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nomaxvalue
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nocache
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SQL;
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$this->db->createCommand($createSequenceSql)->execute();
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}
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}
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}
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