Commit 271aecb0 by Carsten Brandt

Update database-basics.md

parent 8036d416
......@@ -5,6 +5,7 @@ Yii has a database access layer built on top of PHP's [PDO](http://www.php.net/m
uniform API and solves some inconsistencies between different DBMS. By default Yii supports MySQL, SQLite, PostgreSQL,
Oracle and MSSQL.
Configuration
-------------
......@@ -28,21 +29,21 @@ return array(
);
```
After component is configured you can access using the following syntax:
After the component is configured you can access it using the following syntax:
```php
$connection = \Yii::$app->db;
```
You can refer to [[\yii\db\Connection]] for a list of properties you can configure. Also note that you can define more
than one connection components and use both at the same time if needed:
than one connection component and use both at the same time if needed:
```php
$primaryConnection = \Yii::$app->db;
$secondaryConnection = \Yii::$app->secondDb;
```
If you don't want to define connection as application component you can instantiate it directly:
If you don't want to define the connection as an application component you can instantiate it directly:
```php
$connection = new \yii\db\Connection(array(
......@@ -53,6 +54,7 @@ $connection = new \yii\db\Connection(array(
$connection->open();
```
Basic SQL queries
-----------------
......@@ -70,7 +72,7 @@ $posts = $command->queryAll();
When only a single row is returned:
```php
$command = $connection->createCommand('SELECT * FROM tbl_post LIMIT 1');
$command = $connection->createCommand('SELECT * FROM tbl_post WHERE id=1');
$post = $command->query();
```
......@@ -93,7 +95,7 @@ $postCount = $command->queryScalar();
If SQL executed doesn't return any data you can use command's `execute` method:
```php
$command = $connection->createCommand('UPDATE tbl_post SET status=1');
$command = $connection->createCommand('UPDATE tbl_post SET status=1 WHERE id=1');
$command->execute();
```
......@@ -196,7 +198,7 @@ Aside from basic SQL queries [[\yii\db\Command]] contains a set of methods allow
These can be used as follows:
```php
// UPDATE
// CREATE TABLE
$connection->createCommand()->createTable('tbl_post', array(
'id' => 'pk',
'title' => 'string',
......
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