CRUD layer for AMS

This commit is contained in:
shubham_meena 2014-05-25 15:03:20 +05:30
parent 766f1d200a
commit 33eece53b4

View file

@ -81,5 +81,113 @@ class DBLayer{
$this->PDO->commit();
return $lastId;
}
/**
*
* Select function using prepared statement
* @param string $tb_name Table Name to Select
* @param array $data Associative array
* @param string $where where to select
* @return array Array containing fetched data
*/
public function select($query, $data)
{
try{
$sth = $this->PDO->prepare($query);
$this->PDO->beginTransaction();
$sth->execute(array($data));
$this->PDO->commit();
}catch(Exception $e)
{
$this->PDO->rollBack();
throw new Exception("error selection");
return false;
}
return $sth;
}
/**
*
* Update function with prepared statement
* @param string $tb_name name of the table
* @param array $data associative array with values
* @param string $where where part
* @throws Exception error in updating
*/
public function update($tb_name, $data, $where)
{
$field_option_values=null;
foreach ($data as $key => $value)
{
$field_option_values.=",$key".'=:'.$value;
}
$field_option_values = ltrim($field_option_values,',');
try {
$sth = $this->PDO->prepare("UPDATE $tb_name SET $field_option_values WHERE $where ");
foreach ($data as $key => $value)
{
$sth->bindValue(":$key", $value);
}
$this->PDO->beginTransaction();
$sth->execute();
$this->PDO->commit();
}catch (Exception $e)
{
$this->PDO->rollBack();
throw new Exception('error in updating');
}
}
/**
*
* insert function using prepared statements
* @param string $tb_name Name of the table to insert in
* @param array $data Associative array of data to insert
*/
public function insert($tb_name, $data)
{
$field_values =':'. implode(',:', array_keys($data));
$field_options = implode(',', array_keys($data));
try{
$sth = $this->PDO->prepare("INSERT INTO $tb_name ($field_options) VALUE ($field_values)");
foreach ($data as $key => $value )
{
$sth->bindValue(":$key", $value);
}
$this->PDO->beginTransaction();
//execution
$sth->execute();
$this->PDO->commit();
}catch (Exception $e)
{
//for rolling back the changes during transaction
$this->PDO->rollBack();
throw new Exception("error in inseting");
}
}
/**
*
* Delete database entery using prepared statement
* @param string $tb_name
* @param string $where
* @throws error in deleting
*/
public function delete($tb_name, $where)
{
try {
$sth = $this->prepare("DELETE FROM $tb_name WHERE $where");
$this->PDO->beginTransaction();
$sth->execute();
$this->PDO->commit();
}
catch (Exception $e)
{
$this->rollBack();
throw new Exception("error in deleting");
}
}
}