How to get all table and column names from database in Yii Framework

Question

I am working on a module where I want to do dynamic dependent dropdown table and column name functionality.

Ex. Fetch all table names and display it in dropdown fields and after selection of particular table I want to display its all column name again in dropdown field.

The issues are:

1) How to fetch all table name from db?

2) and how to fetch all column name from table?

I tried few articles and forums like http://www.yiiframework.com/forum/index.php/topic/5920-how-can-i-get-the-actual-full-table-name/ but its not working.

Any help would be appreciated.

Thanks

Answer 1

It's quite simple, using an instance of the CDbTableSchema class:

echo 'Name: ', $tbl->name, ' (raw: ', $tbl->rawName, ')';
echo 'Fields: ', implode(', ', $tbl->columnNames);

And so on. There's a lot of methods and properties for this
To get all tables, just use the CDbSchema class docs here .

the CDbSchema class has both the public tableNames property (an array of all tbl namnes) and a tables property, containing all meta-data. That's all, really.

To get to all these instances, the following code should suffice:

$connection = Yii::app()->db;//get connection
$dbSchema = $connection->schema;
//or $connection->getSchema();
$tables = $dbSchema->getTables();//returns array of tbl schema's
foreach($tables as $tbl)
{
    echo $tbl->rawName, ':<br/>', implode(', ', $tbl->columnNames), '<br/>';
}

To create a dropdown list, you simply use the standard CHtml object :

$options = array();
foreach($tables as $tbl)
{//for example
    $options[$tbl->rawName] = $tbl->name;
}
$dropDown = CHtml::dropDownList('tables',$tables[0]->rawName, $options);

Please, spend some time Reading the manual , it's all there. I haven't used Yii that extensively, well, I haven't used it at all, to be honest, yet it only took me 5 minutes to work this out. Just look at the source ! Each and every method/class/property has a link to the exact line in the corresponding file!
Before asking others to figure something out for you, put in some effort .

Answer 2

fetch all column name from table:

TableName::model()->getTableSchema()->getColumnNames();

It'll return an array containing all the column names of TableName.

Answer 3

fetch all column name and labels:

$fields=Tablename::attributeLabels();
foreach($fields as $key=>$value){
    echo "column name : ".$key." and label ".$value."<br/>";
}

it will display all fieldname and label value from modal.....

Answer 4

To get both Tables and Columns refer This Answer , I have pasted the sample code here below, please visit that answer for more explanations.

$connection = Yii::app()->db;//get connection
$dbSchema = $connection->schema;
//or $connection->getSchema();
$tables = $dbSchema->getTables();//returns array of tbl schema's
 foreach($tables as $tbl)
  {
    echo $tbl->rawName, ':<br/>', implode(', ', $tbl->columnNames), '<br/>';
  }