Starting code for schema instrospection in postgres

lib/Cake/Model/Datasource/Database/Dialect/PostgresDialectTrait.php

@@ -148,4 +148,55 @@ protected function _transformFunctionExpression(FunctionExpression $expression)
 		}
 	}
 
+/**
+ * Get the SQL to list the tables
+ *
+ * @param array $config The connection configuration to use for
+ *    getting tables from.
+ * @return array An array of (sql, params) to execute.
+ */
+	public function listTablesSql() {
+		$sql = "SELECT table_name as name FROM INFORMATION_SCHEMA.tables WHERE table_schema = ? ORDER BY name";
+		$schema = empty($config['schema']) ? 'public' : $config['schema'];
+		return [$sql, [$schema]];
+	}
+
+/**
+ * Get the SQL to describe a table in Sqlite.
+ *
+ * @param string $table The table name to describe
+ * @return array An array of (sql, params) to execute.
+ */
+	public function describeTableSql($table) {
+	}
+
+
+/**
+ * Convert a column definition to the abstract types.
+ *
+ * The returned type will be a type that
+ * Cake\Model\Datasource\Database\Type can handle.
+ *
+ * @param string $column The column type + length
+ * @return array List of (type, length)
+ */
+	public function convertColumn($column) {
+	}
+
+/**
+ * Additional metadata columns in table descriptions.
+ *
+ * @return array
+ */
+	public function extraSchemaColumns() {
+	}
+
+/**
+ * Convert field description results into abstract schema fields.
+ *
+ * @return array An array of with the key/values of schema data.
+ */
+	public function convertFieldDescription($row, $fieldParams = []) {
+	}
+
 }

lib/Cake/Test/TestCase/Model/Datasource/Database/Driver/PostgresTest.php

@@ -17,6 +17,9 @@
  */
 namespace Cake\Test\TestCase\Model\Datasource\Database\Driver;
 
+use Cake\Core\Configure;
+use Cake\Model\Datasource\Database\Connection;
+use Cake\Model\Datasource\Database\Driver\Postgres;
 use \PDO;
 
 /**
@@ -126,4 +129,65 @@ public function testConnectionConfigCustom() {
 		$driver->connect($config);
 	}
 
+/**
+ * Helper method for skipping tests that need a real connection.
+ *
+ * @return void
+ */
+	protected function _needsConnection() {
+		$config = Configure::read('Datasource.test');
+		$this->skipIf(strpos($config['datasource'], 'Postgres') === false, 'Not using Postgres for test config');
+	}
+
+/**
+ * Helper method for testing methods.
+ *
+ * @return void
+ */
+	protected function _createTables($connection) {
+		$this->_needsConnection();
+		$connection->execute('DROP TABLE IF EXISTS articles');
+		$connection->execute('DROP TABLE IF EXISTS authors');
+
+		$table = <<<SQL
+CREATE TABLE authors(
+id SERIAL,
+name VARCHAR(50),
+bio DATE,
+created TIMESTAMP
+)
+SQL;
+		$connection->execute($table);
+
+		$table = <<<SQL
+CREATE TABLE articles(
+id BIGINT PRIMARY KEY,
+title VARCHAR(20),
+body TEXT,
+author_id INTEGER NOT NULL,
+published BOOLEAN DEFAULT false,
+views SMALLINT DEFAULT 0,
+created TIMESTAMP
+)
+SQL;
+		$connection->execute($table);
+		$connection->execute('COMMENT ON COLUMN "articles"."title" IS \'a title\'');
+	}
+
+/**
+ * Test listing tables with Postgres
+ *
+ * @return void
+ */
+	public function testListTables() {
+		$connection = new Connection(Configure::read('Datasource.test'));
+		$this->_createTables($connection);
+
+		$result = $connection->listTables();
+		$this->assertInternalType('array', $result);
+		$this->assertCount(2, $result);
+		$this->assertEquals('articles', $result[0]);
+		$this->assertEquals('authors', $result[1]);
+	}
+
 }