diff options
| author | xue <> | 2006-11-24 04:21:06 +0000 |
|---|---|---|
| committer | xue <> | 2006-11-24 04:21:06 +0000 |
| commit | 9478fba18018c1f072f5f6dd4335c5828f23bc80 (patch) | |
| tree | f3718d9fd6af53c8aebc591b047a1b257804fa17 /framework/Data/TDbConnection.php | |
| parent | 750f6c453bb21d6cef0eed50ed742fe7048709d2 (diff) | |
Added DB layer.
Diffstat (limited to 'framework/Data/TDbConnection.php')
| -rw-r--r-- | framework/Data/TDbConnection.php | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/framework/Data/TDbConnection.php b/framework/Data/TDbConnection.php new file mode 100644 index 00000000..cfb4fd72 --- /dev/null +++ b/framework/Data/TDbConnection.php @@ -0,0 +1,512 @@ +<?php
+/**
+ * TDbConnection class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright © 2006 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id $
+ * @package System.Data
+ */
+
+Prado::using('System.Data.TDbTransaction');
+Prado::using('System.Data.TDbCommand');
+
+/**
+ * TDbConnection class
+ *
+ * TDbConnection represents a connection to a database.
+ *
+ * TDbConnection works together with {@link TDbCommand}, {@link TDbDataReader}
+ * and {@link TDbTransaction} to provide data access to various DBMS
+ * in a common set of APIs, thanks to the {@link http://www.php.net/manual/en/ref.pdo.php PDO}
+ * PHP extension.
+ *
+ * To establish a connection, set {@link setActive Active} to true after
+ * specifying {@link setConnectionString ConnectionString}, {@link setUsername Username}
+ * and {@link setPassword Password}.
+ *
+ * The following example shows how to create a TDbConnection instance and establish
+ * the actual connection:
+ * <code>
+ * $connection=new TDbConnection($dsn,$username,$password);
+ * $connection->Active=true;
+ * </code>
+ *
+ * After the DB connection is established, one can execute an SQL statement like the following:
+ * <code>
+ * $command=$connection->createCommand($sqlStatement);
+ * $command->execute(); // a non-query SQL statement execution
+ * // or execute an SQL query and fetch the result set
+ * $reader=$command->query();
+ * foreach($reader as $row) ... // each $row is an array representing a row of data
+ * </code>
+ *
+ * One can do prepared SQL execution and bind parameters to the prepared SQL:
+ * <code>
+ * $command=$connection->createCommand($sqlStatement);
+ * $command->bindParameter($name1,$value1);
+ * $command->bindParameter($name2,$value2);
+ * $command->execute();
+ * </code>
+ *
+ * To use transaction, do like the following:
+ * <code>
+ * try
+ * {
+ * $transaction=$connection->beginTransaction();
+ * $connection->createCommand($sql1)->execute();
+ * $connection->createCommand($sql2)->execute();
+ * //.... other SQL executions
+ * $transaction->commit();
+ * }
+ * catch(Exception $e)
+ * {
+ * $transaction->rollBack();
+ * }
+ * </code>
+ *
+ * TDbConnection provides a set of methods to support setting and querying
+ * of certain DBMS attributes, such as {@link getNullConversion NullConversion}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id $
+ * @package System.Data
+ * @since 3.0
+ */
+class TDbConnection extends TComponent
+{
+ private $_dsn;
+ private $_username;
+ private $_password;
+ private $_attributes=array();
+ private $_active=false;
+ private $_pdo=null;
+
+ /**
+ * Constructor.
+ * Note, the DB connection is not established when this connection
+ * instance is created. Set {@link setActive Active} property to true
+ * to establish the connection.
+ * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
+ * @param string The user name for the DSN string.
+ * @param string The password for the DSN string.
+ * @see http://www.php.net/manual/en/function.pdo-construct.php
+ */
+ public function __construct($dsn='',$username='',$password='')
+ {
+ $this->_dsn=$dsn;
+ $this->_username=$username;
+ $this->_password=$password;
+ }
+
+ /**
+ * @return boolean whether the DB connection is established
+ */
+ public function getActive()
+ {
+ return $this->_active;
+ }
+
+ /**
+ * Open or close the DB connection.
+ * @param boolean whether to open or close DB connection
+ * @throws TDbException if connection fails
+ */
+ public function setActive($value)
+ {
+ $value=TPropertyValue::ensureBoolean($value);
+ if($value!==$this->_active)
+ {
+ if($value)
+ $this->open();
+ else
+ $this->close();
+ }
+ }
+
+ /**
+ * Opens DB connection if it is currently not
+ * @throws TDbException if connection fails
+ */
+ protected function open()
+ {
+ if($this->_pdo===null)
+ {
+ try
+ {
+ $this->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+ $this->_pdo=new PDO($this->getConnectionString(),$this->getUsername(),$this->getPassword(),$this->_attributes);
+ $this->_active=true;
+ }
+ catch(PDOException $e)
+ {
+ throw new TDbException('dbconnection_open_failed',$e->getMessage());
+ }
+ }
+ }
+
+ /**
+ * Closes the currently active DB connection.
+ * It does nothing if the connection is already closed.
+ */
+ protected function close()
+ {
+ $this->_pdo=null;
+ $this->_active=false;
+ }
+
+ /**
+ * @return string The Data Source Name, or DSN, contains the information required to connect to the database.
+ */
+ public function getConnectionString()
+ {
+ return $this->_dsn;
+ }
+
+ /**
+ * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
+ * @see http://www.php.net/manual/en/function.pdo-construct.php
+ */
+ public function setConnectionString($value)
+ {
+ $this->_dsn=$value;
+ }
+
+ /**
+ * @return string the username for establishing DB connection. Defaults to empty string.
+ */
+ public function getUsername()
+ {
+ return $this->_username;
+ }
+
+ /**
+ * @param string the username for establishing DB connection
+ */
+ public function setUsername($value)
+ {
+ $this->_username=$value;
+ }
+
+ /**
+ * @return string the password for establishing DB connection. Defaults to empty string.
+ */
+ public function getPassword()
+ {
+ return $this->_password;
+ }
+
+ /**
+ * @param string the password for establishing DB connection
+ */
+ public function setPassword($value)
+ {
+ $this->_password=$value;
+ }
+
+ /**
+ * @return PDO the PDO instance, null if the connection is not established yet
+ */
+ public function getPdoInstance()
+ {
+ return $this->_pdo;
+ }
+
+ /**
+ * Creates a command for execution.
+ * @param string SQL statement associated with the new command.
+ * @return TDbCommand the DB command
+ * @throws TDbException if the connection is not active
+ */
+ public function createCommand($sql)
+ {
+ if($this->getActive())
+ return new TDbCommand($this,$sql);
+ else
+ throw new TDbException('dbconnection_connection_inactive');
+ }
+
+ /**
+ * Starts a transaction.
+ * @return TDbTransaction the transaction initiated
+ * @throws TDbException if the connection is not active
+ */
+ public function beginTransaction()
+ {
+ if($this->getActive())
+ {
+ $this->_pdo->beginTransaction();
+ return new TDbTransaction($this);
+ }
+ else
+ throw new TDbException('dbconnection_connection_inactive');
+ }
+
+ /**
+ * Returns the ID of the last inserted row or sequence value.
+ * @param string name of the sequence object (required by some DBMS)
+ * @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
+ * @see http://www.php.net/manual/en/function.pdo-lastinsertid.php
+ */
+ public function getLastInsertID($sequenceName='')
+ {
+ if($this->getActive())
+ return $this->_pdo->lastInsertId($sequenceName);
+ else
+ throw new TDbException('dbconnection_connection_inactive');
+ }
+
+ /**
+ * Quotes a string for use in a query.
+ * @param string string to be quoted
+ * @return string the properly quoted string
+ * @see http://www.php.net/manual/en/function.pdo-quote.php
+ */
+ public function quoteString($str)
+ {
+ if($this->getActive())
+ return $this->_pdo->quote($str);
+ else
+ throw new TDbException('dbconnection_connection_inactive');
+ }
+
+ /**
+ * @return TDbColumnCaseMode the case of the column names
+ */
+ public function getColumnCase()
+ {
+ switch($this->getAttribute(PDO::ATTR_CASE))
+ {
+ case PDO::CASE_NATURAL:
+ return TDbColumnCaseMode::Preserved;
+ case PDO::CASE_LOWER:
+ return TDbColumnCaseMode::LowerCase;
+ case PDO::CASE_UPPER:
+ return TDbColumnCaseMode::UpperCase;
+ default:
+ throw new TDbException('dbconnection_columncase_unknown');
+ }
+ }
+
+ /**
+ * @param TDbColumnCaseMode the case of the column names
+ */
+ public function setColumnCase($value)
+ {
+ switch(TPropertyValue::ensureEnum($value,'TDbColumnCaseMode'))
+ {
+ case TDbColumnCaseMode::Preserved:
+ $value=PDO::CASE_NATURAL;
+ break;
+ case TDbColumnCaseMode::LowerCase:
+ $value=PDO::CASE_LOWER;
+ break;
+ case TDbColumnCaseMode::UpperCase:
+ $value=PDO::CASE_UPPER;
+ break;
+ }
+ $this->setAttribute(PDO::ATTR_CASE,$value);
+ }
+
+ /**
+ * @return TDbNullConversionMode how the null and empty strings are converted
+ */
+ public function getNullConversion()
+ {
+ switch($this->getAttribute(PDO::ATTR_ORACLE_NULLS))
+ {
+ case PDO::NULL_NATURAL:
+ return TDbNullConversionMode::Preserved;
+ case PDO::NULL_EMPTY_STRING:
+ return TDbNullConversionMode::EmptyStringToNull;
+ case PDO::NULL_TO_STRING:
+ return TDbNullConversionMode::NullToEmptyString;
+ default:
+ throw new TDbException('dbconnection_nullconversion_unknown');
+ }
+ }
+
+ /**
+ * @param TDbNullConversionMode how the null and empty strings are converted
+ */
+ public function setNullConversion($value)
+ {
+ switch(TPropertyValue::ensureEnum($value,'TDbNullConversionMode'))
+ {
+ case TDbNullConversionMode::Preserved:
+ $value=PDO::NULL_NATURAL;
+ break;
+ case TDbNullConversionMode::EmptyStringToNull:
+ $value=PDO::NULL_EMPTY_STRING;
+ break;
+ case TDbNullConversionMode::NullToEmptyString:
+ $value=PDO::NULL_TO_STRING;
+ break;
+ }
+ $this->setAttribute(PDO::ATTR_ORACLE_NULLS,$value);
+ }
+
+ /**
+ * @return boolean whether creating or updating a DB record will be automatically committed.
+ * Some DBMS (such as sqlite) may not support this feature.
+ */
+ public function getAutoCommit()
+ {
+ return $this->getAttribute(PDO::ATTR_AUTOCOMMIT);
+ }
+
+ /**
+ * @param boolean whether creating or updating a DB record will be automatically committed.
+ * Some DBMS (such as sqlite) may not support this feature.
+ */
+ public function setAutoCommit($value)
+ {
+ $this->setAttribute(PDO::ATTR_AUTOCOMMIT,TPropertyValue::ensureBoolean($value));
+ }
+
+ /**
+ * @return string name of the DB driver
+ */
+ public function getDriverName()
+ {
+ return $this->getAttribute(PDO::ATTR_DRIVER_NAME);
+ }
+
+ /**
+ * @return string the version information of the DB driver
+ */
+ public function getClientVersion()
+ {
+ return $this->getAttribute(PDO::ATTR_CLIENT_VERSION);
+ }
+
+ /**
+ * @return string the status of the connection
+ * Some DBMS (such as sqlite) may not support this feature.
+ */
+ public function getConnectionStatus()
+ {
+ return $this->getAttribute(PDO::ATTR_CONNECTION_STATUS);
+ }
+
+ /**
+ * @return boolean whether the connection is persistent or not
+ * Some DBMS (such as sqlite) may not support this feature.
+ */
+ public function getPersistent()
+ {
+ return $this->getAttribute(PDO::ATTR_PERSISTENT);
+ }
+
+ /**
+ * @return boolean whether the connection performs data prefetching
+ */
+ public function getPrefetch()
+ {
+ return $this->getAttribute(PDO::ATTR_PREFETCH);
+ }
+
+ /**
+ * @return string the information of DBMS server
+ */
+ public function getServerInfo()
+ {
+ return $this->getAttribute(PDO::ATTR_SERVER_INFO);
+ }
+
+ /**
+ * @return string the version information of DBMS server
+ */
+ public function getServerVersion()
+ {
+ return $this->getAttribute(PDO::ATTR_SERVER_VERSION);
+ }
+
+ /**
+ * @return int timeout settings for the connection
+ */
+ public function getTimeout()
+ {
+ return $this->getAttribute(PDO::ATTR_TIMEOUT);
+ }
+
+ /**
+ * Obtains a specific DB connection attribute information.
+ * @param int the attribute to be queried
+ * @return mixed the corresponding attribute information
+ * @see http://www.php.net/manual/en/function.pdo-getattribute.php
+ */
+ public function getAttribute($name)
+ {
+ if($this->getActive())
+ return $this->_pdo->getAttribute($name);
+ else
+ throw new TDbException('dbconnection_connection_inactive');
+ }
+
+ /**
+ * Sets an attribute on the database connection.
+ * @param int the attribute to be set
+ * @param mixed the attribute value
+ * @see http://www.php.net/manual/en/function.pdo-setattribute.php
+ */
+ public function setAttribute($name,$value)
+ {
+ if($this->getActive())
+ $this->_pdo->setAttribute($name,$value);
+ else
+ $this->_attributes[$name]=$value;
+ }
+}
+
+/**
+ * TDbColumnCaseMode
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id $
+ * @package System.Data
+ * @since 3.0
+ */
+class TDbColumnCaseMode extends TEnumerable
+{
+ /**
+ * Column name cases are kept as is from the database
+ */
+ const Preserved='Preserved';
+ /**
+ * Column names are converted to lower case
+ */
+ const LowerCase='LowerCase';
+ /**
+ * Column names are converted to upper case
+ */
+ const UpperCase='UpperCase';
+}
+
+/**
+ * TDbNullConversionMode
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id $
+ * @package System.Data
+ * @since 3.0
+ */
+class TDbNullConversionMode extends TEnumerable
+{
+ /**
+ * No conversion is performed for null and empty values.
+ */
+ const Preserved='Preserved';
+ /**
+ * NULL is converted to empty string
+ */
+ const NullToEmptyString='NullToEmptyString';
+ /**
+ * Empty string is converted to NULL
+ */
+ const EmptyStringToNull='EmptyStringToNull';
+}
+
+?>
\ No newline at end of file |