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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\oci;
use yii\db\TableSchema;
use yii\db\ColumnSchema;
/**
* Schema is the class for retrieving metadata from an Oracle database
*
* @todo mapping from physical types to abstract types
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Schema extends \yii\db\Schema
{
/**
* @inheritdoc
*/
public function init()
{
parent::init();
if ($this->defaultSchema === null) {
$this->defaultSchema = $this->db->username;
}
}
/**
* @inheritdoc
*/
public function releaseSavepoint($name)
{
// does nothing as Oracle does not support this
}
/**
* @inheritdoc
*/
public function quoteSimpleTableName($name)
{
return '"' . $name . '"';
}
/**
* @inheritdoc
*/
public function quoteSimpleColumnName($name)
{
return '"' . $name . '"';
}
/**
* @inheritdoc
*/
public function createQueryBuilder()
{
return new QueryBuilder($this->db);
}
/**
* @inheritdoc
*/
public function loadTableSchema($name)
{
$table = new TableSchema();
$this->resolveTableNames($table, $name);
if ($this->findColumns($table)) {
$this->findConstraints($table);
return $table;
} else {
return null;
}
}
/**
* Resolves the table name and schema name (if any).
*
* @param TableSchema $table the table metadata object
* @param string $name the table name
*/
protected function resolveTableNames($table, $name)
{
$parts = explode('.', str_replace('"', '', $name));
if (isset($parts[1])) {
$table->schemaName = $parts[0];
$table->name = $parts[1];
} else {
$table->schemaName = $this->defaultSchema;
$table->name = $name;
}
$table->fullName = $table->schemaName !== $this->defaultSchema ? $table->schemaName . '.' . $table->name : $table->name;
}
/**
* Collects the table column metadata.
* @param TableSchema $table the table schema
* @return boolean whether the table exists
*/
protected function findColumns($table)
{
$schemaName = $table->schemaName;
$tableName = $table->name;
$sql = <<<EOD
SELECT a.column_name, a.data_type ||
case
when data_precision is not null
then '(' || a.data_precision ||
case when a.data_scale > 0 then ',' || a.data_scale else '' end
|| ')'
when data_type = 'DATE' then ''
when data_type = 'NUMBER' then ''
else '(' || to_char(a.data_length) || ')'
end as data_type,
a.nullable, a.data_default,
( SELECT D.constraint_type
FROM ALL_CONS_COLUMNS C
inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
WHERE C.OWNER = B.OWNER
and C.table_name = B.object_name
and C.column_name = A.column_name
and D.constraint_type = 'P') as Key,
com.comments as column_comment
FROM ALL_TAB_COLUMNS A
inner join ALL_OBJECTS B ON b.owner = a.owner and ltrim(B.OBJECT_NAME) = ltrim(A.TABLE_NAME)
LEFT JOIN all_col_comments com ON (A.owner = com.owner AND A.table_name = com.table_name AND A.column_name = com.column_name)
WHERE
a.owner = '{$schemaName}'
and (b.object_type = 'TABLE' or b.object_type = 'VIEW')
and b.object_name = '{$tableName}'
ORDER by a.column_id
EOD;
try {
$columns = $this->db->createCommand($sql)->queryAll();
} catch (\Exception $e) {
return false;
}
foreach ($columns as $column) {
$c = $this->createColumn($column);
$table->columns[$c->name] = $c;
if ($c->isPrimaryKey) {
$table->primaryKey[] = $c->name;
$table->sequenceName = '';
$c->autoIncrement = true;
}
}
return true;
}
protected function createColumn($column)
{
$c = new ColumnSchema();
$c->name = $column['COLUMN_NAME'];
$c->allowNull = $column['NULLABLE'] === 'Y';
$c->isPrimaryKey = strpos($column['KEY'], 'P') !== false;
$c->comment = $column['COLUMN_COMMENT'] === null ? '' : $column['COLUMN_COMMENT'];
$this->extractColumnType($c, $column['DATA_TYPE']);
$this->extractColumnSize($c, $column['DATA_TYPE']);
if (!$column->isPrimaryKey) {
if (stripos($column['DATA_DEFAULT'], 'timestamp') !== false) {
$c->defaultValue = null;
} else {
$c->defaultValue = $c->typecast($column['DATA_DEFAULT']);
}
}
return $c;
}
protected function findConstraints($table)
{
$sql = <<<EOD
SELECT D.constraint_type as CONSTRAINT_TYPE, C.COLUMN_NAME, C.position, D.r_constraint_name,
E.table_name as table_ref, f.column_name as column_ref,
C.table_name
FROM ALL_CONS_COLUMNS C
inner join ALL_constraints D on D.OWNER = C.OWNER and D.constraint_name = C.constraint_name
left join ALL_constraints E on E.OWNER = D.r_OWNER and E.constraint_name = D.r_constraint_name
left join ALL_cons_columns F on F.OWNER = E.OWNER and F.constraint_name = E.constraint_name and F.position = c.position
WHERE C.OWNER = '{$table->schemaName}'
and C.table_name = '{$table->name}'
and D.constraint_type <> 'P'
order by d.constraint_name, c.position
EOD;
$command = $this->db->createCommand($sql);
foreach ($command->queryAll() as $row) {
if ($row['CONSTRAINT_TYPE'] === 'R') {
$name = $row["COLUMN_NAME"];
$table->foreignKeys[$name] = [$row["TABLE_REF"], $row["COLUMN_REF"]];
}
}
}
/**
* @inheritdoc
*/
protected function findTableNames($schema = '')
{
if ($schema === '') {
$sql = <<<EOD
SELECT table_name, '{$schema}' as table_schema FROM user_tables
EOD;
$command = $this->db->createCommand($sql);
} else {
$sql = <<<EOD
SELECT object_name as table_name, owner as table_schema FROM all_objects
WHERE object_type = 'TABLE' AND owner=:schema
EOD;
$command = $this->db->createCommand($sql);
$command->bindParam(':schema', $schema);
}
$rows = $command->queryAll();
$names = [];
foreach ($rows as $row) {
$names[] = $row['TABLE_NAME'];
}
return $names;
}
/**
* Extracts the data types for the given column
* @param ColumnSchema $column
* @param string $dbType DB type
*/
protected function extractColumnType($column, $dbType)
{
$column->dbType = $dbType;
if (strpos($dbType, 'FLOAT') !== false) {
$column->type = 'double';
} elseif (strpos($dbType, 'NUMBER') !== false || strpos($dbType, 'INTEGER') !== false) {
if (strpos($dbType, '(') && preg_match('/\((.*)\)/', $dbType, $matches)) {
$values = explode(',', $matches[1]);
if (isset($values[1]) && (((int) $values[1]) > 0)) {
$column->type = 'double';
} else {
$column->type = 'integer';
}
} else {
$column->type = 'double';
}
} else {
$column->type = 'string';
}
}
/**
* Extracts size, precision and scale information from column's DB type.
* @param ColumnSchema $column
* @param string $dbType the column's DB type
*/
protected function extractColumnSize($column, $dbType)
{
if (strpos($dbType, '(') && preg_match('/\((.*)\)/', $dbType, $matches)) {
$values = explode(',', $matches[1]);
$column->size = $column->precision = (int) $values[0];
if (isset($values[1])) {
$column->scale = (int) $values[1];
}
}
}
}