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Merge pull request #505 from gevik/pgsql-driver
Pgsql driver implementation (update 4)
This commit is contained in:
Qiang Xue
41
framework/yii/db/pgsql/QueryBuilder.php
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41
framework/yii/db/pgsql/QueryBuilder.php
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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db\pgsql;
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/**
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* QueryBuilder is the query builder for PostgreSQL databases.
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*
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* @author Gevik Babakhani <gevikb@gmail.com>
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* @since 2.0
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*/
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class QueryBuilder extends \yii\db\QueryBuilder
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{
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/**
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* @var array mapping from abstract column types (keys) to physical column types (values).
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*/
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public $typeMap = array(
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Schema::TYPE_PK => 'serial not null primary key',
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Schema::TYPE_STRING => 'varchar',
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Schema::TYPE_TEXT => 'text',
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Schema::TYPE_SMALLINT => 'smallint',
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Schema::TYPE_INTEGER => 'integer',
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Schema::TYPE_BIGINT => 'bigint',
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Schema::TYPE_FLOAT => 'double precision',
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Schema::TYPE_DECIMAL => 'numeric',
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Schema::TYPE_DATETIME => 'timestamp',
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Schema::TYPE_TIMESTAMP => 'timestamp',
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Schema::TYPE_TIME => 'time',
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Schema::TYPE_DATE => 'date',
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Schema::TYPE_BINARY => 'bytea',
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Schema::TYPE_BOOLEAN => 'boolean',
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Schema::TYPE_MONEY => 'numeric(19,4)',
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);
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}
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284
framework/yii/db/pgsql/Schema.php
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284
framework/yii/db/pgsql/Schema.php
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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db\pgsql;
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use yii\db\TableSchema;
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use yii\db\ColumnSchema;
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/**
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* Schema is the class for retrieving metadata from a PostgreSQL database
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* (version 9.x and above).
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*
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* @author Gevik Babakhani <gevikb@gmail.com>
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* @since 2.0
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*/
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class Schema extends \yii\db\Schema
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{
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/**
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* The default schema used for the current session.
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* @var string
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*/
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public $defaultSchema = 'public';
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/**
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* @var array mapping from physical column types (keys) to abstract
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* column types (values)
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*/
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public $typeMap = array(
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'abstime' => self::TYPE_TIMESTAMP,
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'bit' => self::TYPE_STRING,
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'boolean' => self::TYPE_BOOLEAN,
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'box' => self::TYPE_STRING,
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'character' => self::TYPE_STRING,
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'bytea' => self::TYPE_BINARY,
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'char' => self::TYPE_STRING,
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'cidr' => self::TYPE_STRING,
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'circle' => self::TYPE_STRING,
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'date' => self::TYPE_DATE,
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'real' => self::TYPE_FLOAT,
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'double precision' => self::TYPE_DECIMAL,
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'inet' => self::TYPE_STRING,
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'smallint' => self::TYPE_SMALLINT,
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'integer' => self::TYPE_INTEGER,
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'bigint' => self::TYPE_BIGINT,
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'interval' => self::TYPE_STRING,
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'json' => self::TYPE_STRING,
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'line' => self::TYPE_STRING,
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'macaddr' => self::TYPE_STRING,
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'money' => self::TYPE_MONEY,
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'name' => self::TYPE_STRING,
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'numeric' => self::TYPE_STRING,
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'numrange' => self::TYPE_DECIMAL,
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'oid' => self::TYPE_BIGINT, // should not be used. it's pg internal!
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'path' => self::TYPE_STRING,
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'point' => self::TYPE_STRING,
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'polygon' => self::TYPE_STRING,
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'text' => self::TYPE_TEXT,
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'time without time zone' => self::TYPE_TIME,
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'timestamp without time zone' => self::TYPE_TIMESTAMP,
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'timestamp with time zone' => self::TYPE_TIMESTAMP,
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'time with time zone' => self::TYPE_TIMESTAMP,
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'unknown' => self::TYPE_STRING,
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'uuid' => self::TYPE_STRING,
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'bit varying' => self::TYPE_STRING,
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'character varying' => self::TYPE_STRING,
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'xml' => self::TYPE_STRING
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);
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/**
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* Creates a query builder for the MySQL database.
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* @return QueryBuilder query builder instance
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*/
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public function createQueryBuilder() {
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return new QueryBuilder($this->db);
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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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* @param TableSchema $table the table metadata object
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* @param string $name the table name
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*/
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protected function resolveTableNames($table, $name) {
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$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->defaultSchema;
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}
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}
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/**
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* Quotes a table name for use in a query.
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* A simple table name has no schema prefix.
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* @param string $name table name
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* @return string the properly quoted table name
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*/
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public function quoteSimpleTableName($name) {
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return strpos($name, '"') !== false ? $name : '"' . $name . '"';
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}
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/**
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* Loads the metadata for the specified table.
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* @param string $name table name
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* @return TableSchema|null driver dependent table metadata. Null if the table does not exist.
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*/
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public function loadTableSchema($name) {
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$table = new TableSchema();
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$this->resolveTableNames($table, $name);
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if ($this->findColumns($table)) {
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$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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* Collects the foreign key column details for the given table.
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* @param TableSchema $table the table metadata
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*/
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protected function findConstraints($table) {
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$tableName = $this->quoteValue($table->name);
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$tableSchema = $this->quoteValue($table->schemaName);
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//We need to extract the constraints de hard way since:
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//http://www.postgresql.org/message-id/26677.1086673982@sss.pgh.pa.us
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$sql = <<<SQL
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select
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ct.conname as containst,
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c.relname as table_name,
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ns.nspname as table_schema,
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current_database() as table_catalog,
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(select string_agg(attname,',') attname from pg_attribute where attrelid=ct.conrelid and attnum = any(ct.conkey)) as columns,
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fc.relname as foreign_table_name,
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fns.nspname as foreign_table_schema,
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current_database() as foreign_table_catalog,
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(select string_agg(attname,',') attname from pg_attribute where attrelid=ct.confrelid and attnum = any(ct.confkey)) as foreign_columns
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from
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pg_constraint ct
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inner join pg_class c on c.oid=ct.conrelid
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inner join pg_namespace ns on c.relnamespace=ns.oid
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left join pg_class fc on fc.oid=ct.confrelid
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left join pg_namespace fns on fc.relnamespace=fns.oid
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where
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ct.contype='f'
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and c.relname={$tableName}
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and ns.nspname={$tableSchema}
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SQL;
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$constraints = $this->db->createCommand($sql)->queryAll();
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foreach ($constraints as $constraint) {
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$columns = explode(',', $constraint['columns']);
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$fcolumns = explode(',', $constraint['foreign_columns']);
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$citem = array($constraint['foreign_table_name']);
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foreach ($columns as $idx => $column) {
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$citem[] = array($fcolumns[$idx] => $column);
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}
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$table->foreignKeys[] = $citem;
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}
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}
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/**
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* Collects the metadata of table columns.
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* @param TableSchema $table the table metadata
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* @return boolean whether the table exists in the database
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*/
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protected function findColumns($table) {
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$tableName = $this->db->quoteValue($table->name);
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$schemaName = $this->db->quoteValue($table->schemaName);
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$sql = <<<SQL
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SELECT
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current_database() as table_catalog,
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d.nspname AS table_schema,
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c.relname AS table_name,
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a.attname AS column_name,
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t.typname AS data_type,
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a.attlen AS character_maximum_length,
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pg_catalog.col_description(c.oid, a.attnum) AS column_comment,
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a.atttypmod AS modifier,
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a.attnotnull = false AS is_nullable,
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CAST(pg_get_expr(ad.adbin, ad.adrelid) AS varchar) AS column_default,
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coalesce(pg_get_expr(ad.adbin, ad.adrelid) ~ 'nextval',false) AS is_autoinc,
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array_to_string((select array_agg(enumlabel) from pg_enum where enumtypid=a.atttypid)::varchar[],',') as enum_values,
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CASE atttypid
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WHEN 21 /*int2*/ THEN 16
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WHEN 23 /*int4*/ THEN 32
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WHEN 20 /*int8*/ THEN 64
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WHEN 1700 /*numeric*/ THEN
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CASE WHEN atttypmod = -1
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THEN null
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ELSE ((atttypmod - 4) >> 16) & 65535
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END
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WHEN 700 /*float4*/ THEN 24 /*FLT_MANT_DIG*/
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WHEN 701 /*float8*/ THEN 53 /*DBL_MANT_DIG*/
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ELSE null
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END AS numeric_precision,
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CASE
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WHEN atttypid IN (21, 23, 20) THEN 0
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WHEN atttypid IN (1700) THEN
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CASE
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WHEN atttypmod = -1 THEN null
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ELSE (atttypmod - 4) & 65535
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END
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ELSE null
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END AS numeric_scale,
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CAST(
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information_schema._pg_char_max_length(information_schema._pg_truetypid(a, t), information_schema._pg_truetypmod(a, t))
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AS numeric
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) AS size,
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a.attnum = any (ct.conkey) as is_pkey
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FROM
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pg_class c
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LEFT JOIN pg_attribute a ON a.attrelid = c.oid
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LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
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LEFT JOIN pg_type t ON a.atttypid = t.oid
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LEFT JOIN pg_namespace d ON d.oid = c.relnamespace
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LEFT join pg_constraint ct on ct.conrelid=c.oid and ct.contype='p'
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WHERE
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a.attnum > 0
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and c.relname = {$tableName}
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and d.nspname = {$schemaName}
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ORDER BY
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a.attnum;
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SQL;
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try {
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$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 $column) {
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$column = $this->loadColumnSchema($column);
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$table->columns[$column->name] = $column;
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if ($column->isPrimaryKey === true) {
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$table->primaryKey[] = $column->name;
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if ($table->sequenceName === null && preg_match("/nextval\('\w+'(::regclass)?\)/", $column->defaultValue) === 1) {
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$table->sequenceName = preg_replace(array('/nextval/', '/::/', '/regclass/', '/\'\)/', '/\(\'/'), '', $column->defaultValue);
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}
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}
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}
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return true;
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}
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/**
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* Loads the column information into a [[ColumnSchema]] object.
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* @param array $info column information
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* @return ColumnSchema the column schema object
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*/
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protected function loadColumnSchema($info) {
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$column = new ColumnSchema();
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$column->allowNull = $info['is_nullable'];
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$column->autoIncrement = $info['is_autoinc'];
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$column->comment = $info['column_comment'];
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$column->dbType = $info['data_type'];
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$column->defaultValue = $info['column_default'];
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$column->enumValues = explode(',', str_replace(array("''"), array("'"), $info['enum_values']));
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$column->unsigned = false; // has no meanining in PG
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$column->isPrimaryKey = $info['is_pkey'];
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$column->name = $info['column_name'];
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$column->precision = $info['numeric_precision'];
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$column->scale = $info['numeric_scale'];
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$column->size = $info['size'];
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if (isset($this->typeMap[$column->dbType])) {
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$column->type = $this->typeMap[$column->dbType];
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} else {
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$column->type = self::TYPE_STRING;
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}
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$column->phpType = $this->getColumnPhpType($column);
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return $column;
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}
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}
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