private $max_length = 0;
/**
- * Builder method for the class
+ * Builder method for the class
* @param $db DatabaseIbm_db2: Database interface
* @param $table String: table name
* @param $field String: column name
public function getData() {
return $this->mData;
}
-
+
public function __toString()
{
return $this->mData;
protected $mFakeSlaveLag = null, $mFakeMaster = false;
*
*/
-
+
/** Database server port */
protected $mPort = null;
/** Schema for tables, stored procedures, triggers */
protected $mAffectedRows = null;
/** Number of rows returned by last SELECT */
protected $mNumRows = null;
-
+
/** Connection config options - see constructor */
public $mConnOptions = array();
/** Statement config options -- see constructor */
public $mStmtOptions = array();
-
+
/** Default schema */
const USE_GLOBAL = "mediawiki";
-
+
/** Option that applies to nothing */
const NONE_OPTION = 0x00;
/** Option that applies to connection objects */
const CONN_OPTION = 0x01;
/** Option that applies to statement objects */
const STMT_OPTION = 0x02;
-
+
/** Regular operation mode -- minimal debug messages */
const REGULAR_MODE = 'regular';
/** Installation mode -- lots of debug messages */
const INSTALL_MODE = 'install';
-
+
/** Controls the level of debug message output */
protected $mMode = self::REGULAR_MODE;
-
+
/** Last sequence value used for a primary key */
protected $mInsertId = null;
-
+
######################################
# Getters and Setters
######################################
-
+
/**
* Returns true if this database supports (and uses) cascading deletes
*/
function strictIPs() {
return true;
}
-
+
/**
* Returns true if this database uses timestamps rather than integers
*/
function functionalIndexes() {
return true;
}
-
+
/**
* Returns a unique string representing the wiki on the server
*/
function getType() {
return 'ibm_db2';
}
-
+
######################################
# Setup
######################################
-
-
+
+
/**
- *
+ *
* @param $server String: hostname of database server
* @param $user String: username
* @param $password String: password
$this->mOut =& $wgOut;
$this->mFailFunction = $failFunction;
$this->mFlags = DBO_TRX | $flags;
-
+
if ( $schema == self::USE_GLOBAL ) {
$this->mSchema = $wgDBmwschema;
}
else {
$this->mSchema = $schema;
}
-
+
// configure the connection and statement objects
$this->setDB2Option( 'db2_attr_case', 'DB2_CASE_LOWER',
self::CONN_OPTION | self::STMT_OPTION );
self::STMT_OPTION );
$this->setDB2Option( 'rowcount', 'DB2_ROWCOUNT_PREFETCH_ON',
self::STMT_OPTION );
-
+
$this->open( $server, $user, $password, $dbName );
}
-
+
/**
* Enables options only if the ibm_db2 extension version supports them
* @param $name String: name of the option in the options array
"$const is not defined. ibm_db2 version is likely too low." );
}
}
-
+
/**
* Outputs debug information in the appropriate place
* @param $string String: the relevant debug message
if ( $this->mMode == self::INSTALL_MODE ) {
print "<li><pre>$string</pre></li>";
flush();
- }
+ }
}
-
+
/**
* Opens a database connection and returns it
* Closes any existing connection
// Load the port number
global $wgDBport;
wfProfileIn( __METHOD__ );
-
+
// Load IBM DB2 driver if missing
wfDl( 'ibm_db2' );
if ( strlen( $user ) < 1) {
return null;
}
-
+
// Close existing connection
$this->close();
// Cache conn info
$this->mUser = $user;
$this->mPassword = $password;
$this->mDBname = $dbName;
-
+
$this->openUncataloged( $dbName, $user, $password, $server, $port );
-
+
// Apply connection config
db2_set_option( $this->mConn, $this->mConnOptions, 1 );
// Some MediaWiki code is still transaction-less (?).
$this->mOpened = true;
$this->applySchema();
-
+
wfProfileOut( __METHOD__ );
return $this->mConn;
}
-
+
/**
* Opens a cataloged database connection, sets mConn
*/
{
@$this->mConn = db2_pconnect( $dbName, $user, $password );
}
-
+
/**
* Opens an uncataloged database connection, sets mConn
*/
$str .= "PROTOCOL=TCPIP;";
$str .= "UID=$user;";
$str .= "PWD=$password;";
-
+
@$this->mConn = db2_pconnect( $str, $user, $password );
}
-
+
/**
* Closes a database connection, if it is open
* Returns success, true if already closed
return true;
}
}
-
+
/**
* Returns a fresh instance of this class
*
return new DatabaseIbm_db2( $server, $user, $password, $dbName,
$failFunction, $flags );
}
-
+
/**
* Retrieves the most current database error
* Forces a database rollback
//$this->rollback();
return $stmterr;
}
-
+
return false;
}
-
+
/**
* Get the last error number
* Return 0 if no error
}
return 0;
}
-
+
/**
* Is a database connection open?
- * @return
+ * @return
*/
public function isOpen() { return $this->mOpened; }
-
+
/**
* The DBMS-dependent part of query()
* @param $sql String: SQL query.
/*private*/
public function doQuery( $sql ) {
$this->applySchema();
-
+
$ret = db2_exec( $this->mConn, $sql, $this->mStmtOptions );
if( $ret == FALSE ) {
$error = db2_stmt_errormsg();
$this->mAffectedRows = null; // Not calculated until asked for
return $ret;
}
-
+
/**
* @return string Version information from the database
*/
$info = db2_server_info( $this->mConn );
return $info->DBMS_VER;
}
-
+
/**
* Queries whether a given table exists
* @return boolean
EOF;
$res = $this->query( $sql );
if ( !$res ) return false;
-
+
// If the table exists, there should be one of it
@$row = $this->fetchRow( $res );
$count = $row[0];
if ( $count == '1' or $count == 1 ) {
return true;
}
-
+
return false;
}
-
+
/**
* Fetch the next row from the given result object, in object form.
* Fields can be retrieved with $row->fieldname, with fields acting like
}
return $row;
}
-
+
/**
* Override if introduced to base Database class
*/
public function initial_setup() {
// do nothing
}
-
+
/**
* Create tables, stored procedures, and so on
*/
public function setup_database() {
try {
// TODO: switch to root login if available
-
+
// Switch into the correct namespace
$this->applySchema();
$this->begin();
-
+
$res = $this->sourceFile( "../maintenance/ibm_db2/tables.sql" );
if ( $res !== true ) {
print " <b>FAILED</b>: " . htmlspecialchars( $res ) . "</li>";
print "<li>Foreign keys done</li>";
}
$res = null;
-
+
// TODO: populate interwiki links
-
+
if ( $this->lastError() ) {
$this->installPrint(
"Errors encountered during table creation -- rolled back" );
$this->installPrint( "Please install again" );
$this->rollback();
}
- else {
+ else {
$this->commit();
}
}
return "'$s'";
}
}
-
+
/**
* Verifies that a DB2 column/field type is numeric
* @return bool true if numeric
}
return false;
}
-
+
/**
* Alias for addQuotes()
* @param $s String: string to escape
*/
public function strencode( $s ) {
// Bloody useless function
- // Prepends backslashes to \x00, \n, \r, \, ', " and \x1a.
+ // Prepends backslashes to \x00, \n, \r, \, ', " and \x1a.
// But also necessary
$s = db2_escape_string( $s );
// Wide characters are evil -- some of them look like '
$s = str_replace( $from, $to, $s ); // DB2 expects '', not \' escaping
return $s;
}
-
+
/**
* Switch into the database schema
*/
$this->begin();
$this->doQuery( "SET SCHEMA = $this->mSchema" );
$this->commit();
- }
+ }
}
-
+
/**
* Start a transaction (mandatory)
*/
public function begin( $fname = 'DatabaseIbm_db2::begin' ) {
// BEGIN is implicit for DB2
// However, it requires that AutoCommit be off.
-
+
// Some MediaWiki code is still transaction-less (?).
// The strategy is to keep AutoCommit on for that code
// but switch it off whenever a transaction is begun.
db2_autocommit( $this->mConn, DB2_AUTOCOMMIT_OFF );
-
+
$this->mTrxLevel = 1;
}
-
+
/**
* End a transaction
* Must have a preceding begin()
*/
public function commit( $fname = 'DatabaseIbm_db2::commit' ) {
db2_commit( $this->mConn );
-
+
// Some MediaWiki code is still transaction-less (?).
// The strategy is to keep AutoCommit on for that code
// but switch it off whenever a transaction is begun.
db2_autocommit( $this->mConn, DB2_AUTOCOMMIT_ON );
-
+
$this->mTrxLevel = 0;
}
-
+
/**
* Cancel a transaction
*/
db2_autocommit( $this->mConn, DB2_AUTOCOMMIT_ON );
$this->mTrxLevel = 0;
}
-
+
/**
* Makes an encoded list of strings from an array
* $mode:
throw new DBUnexpectedError( $this,
'DatabaseBase::makeList called with incorrect parameters' );
}
-
+
// if this is for a prepared UPDATE statement
// (this should be promoted to the parent class
// once other databases use prepared statements)
}
}
$list .= '';
-
+
return $list;
}
-
+
// otherwise, call the usual function
return parent::makeList( $a, $mode );
}
-
+
/**
* Construct a LIMIT query with optional offset
* This is used for query pages
}
return "$sql FETCH FIRST $limit ROWS ONLY ";
}
-
+
/**
* Handle reserved keyword replacement in table names
- * @return
+ * @return
* @param $name Object
*/
public function tableName( $name ) {
// we want maximum compatibility with MySQL schema
return $name;
}
-
+
/**
* Generates a timestamp in an insertable format
* @return string timestamp value
*/
return null;
}
-
+
/**
* This must be called after nextSequenceVal
* @return Last sequence value used as a primary key
public function insertId() {
return $this->mInsertId;
}
-
+
/**
* Updates the mInsertId property with the value of the last insert
* into a generated column
$this->mInsertId = db2_last_insert_id( $this->mConn );
}
}
-
+
/**
* INSERT wrapper, inserts an array into a table
*
if ( !( isset( $args[0] ) && is_array( $args[0] ) ) ) {
$args = array( $args );
}
-
+
// prevent insertion of NULL into primary key columns
list( $args, $primaryKeys ) = $this->removeNullPrimaryKeys( $table, $args );
// if there's only one primary key
if ( count( $primaryKeys ) == 1 ) {
$primaryKey = $primaryKeys[0];
}
-
+
// get column names
$keys = array_keys( $args[0] );
$key_count = count( $keys );
//$this->installPrint( "$sql" );
//$this->installPrint( print_r( $args, true ));
$stmt = $this->prepare( $sql );
-
+
// start a transaction/enter transaction mode
$this->begin();
// For future use, we may want to track the number of actual inserts
// Right now, insert (all writes) simply return true/false
$numrowsinserted = 0;
-
+
// always return true
$res = true;
-
+
foreach ( $args as $row ) {
$overhead = "SAVEPOINT $ignore ON ROLLBACK RETAIN CURSORS";
db2_exec( $this->mConn, $overhead, $this->mStmtOptions );
-
-
+
+
$this->execute( $stmt, $row );
-
+
if ( !$res2 ) {
$this->installPrint( "Last error:" );
$this->installPrint( $this->lastError() );
}
// get the last inserted value into a generated column
$this->calcInsertId( $table, $primaryKey, $stmt );
-
+
$errNum = $this->lastErrno();
if ( $errNum ) {
db2_exec( $this->mConn, "ROLLBACK TO SAVEPOINT $ignore",
$numrowsinserted++;
}
}
-
+
$olde = error_reporting( $olde );
// Set the affected row count for the whole operation
$this->mAffectedRows = $numrowsinserted;
// commit either way
$this->commit();
$this->freePrepared( $stmt );
-
+
return $res;
}
-
+
/**
* Given a table name and a hash of columns with values
* Removes primary key columns from the hash where the value is NULL
- *
+ *
* @param $table String: name of the table
* @param $args Array of hashes of column names with values
* @return Array: tuple( filtered array of columns, array of primary keys )
// return modified hash
return array( $args, $keys );
}
-
+
/**
* UPDATE wrapper, takes a condition array and a SET array
*
// if not, convert to simple array first
$result = $this->execute( $stmt, $values );
$this->freePrepared( $stmt );
-
+
return $result;
}
-
+
/**
* DELETE query wrapper
*
$sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
}
$result = $this->query( $sql, $fname );
-
+
return $result;
}
-
+
/**
* Returns the number of rows affected by the last query or 0
* @return Integer: the number of rows affected by the last query
return 0;
return db2_num_rows( $this->mLastResult );
}
-
+
/**
* Simulates REPLACE with a DELETE followed by INSERT
* @param $table Object
$this->query( $sql, $fname );
}
}
-
+
/**
* Returns the number of rows in the result set
* Has to be called right after the corresponding select query
return 0;
}
}
-
+
/**
* Moves the row pointer of the result set
* @param $res Object: result set
}
return db2_fetch_row( $res, $row );
}
-
+
###
- # Fix notices in Block.php
+ # Fix notices in Block.php
###
-
+
/**
* Frees memory associated with a statement resource
* @param $res Object: statement resource to free
throw new DBUnexpectedError( $this, "Unable to free DB2 result\n" );
}
}
-
+
/**
* Returns the number of columns in a resource
* @param $res Object: statement resource
}
return db2_num_fields( $res );
}
-
+
/**
* Returns the nth column name
* @param $res Object: statement resource
}
return db2_field_name( $res, $n );
}
-
+
/**
* SELECT wrapper
*
{
$res = parent::select( $table, $vars, $conds, $fname, $options,
$join_conds );
-
+
// We must adjust for offset
if ( isset( $options['LIMIT'] ) ) {
if ( isset ( $options['OFFSET'] ) ) {
$offset = $options['OFFSET'];
}
}
-
-
+
+
// DB2 does not have a proper num_rows() function yet, so we must emulate
// DB2 9.5.4 and the corresponding ibm_db2 driver will introduce
// a working one
// TODO: Yay!
-
+
// we want the count
$vars2 = array( 'count( * ) as num_rows' );
// respecting just the limit option
if ( isset( $options['GROUP BY'] ) ) {
return $res;
}
-
+
$res2 = parent::select( $table, $vars2, $conds, $fname, $options2,
$join_conds );
$obj = $this->fetchObject( $res2 );
$this->mNumRows = $obj->num_rows;
-
-
+
+
return $res;
}
-
+
/**
* Handles ordering, grouping, and having options ('GROUP BY' => colname)
* Has limited support for per-column options (colnum => 'DISTINCT')
- *
+ *
* @private
*
* @param $options Associative array of options to be turned into
if ( isset( $options['ORDER BY'] ) ) {
$preLimitTail .= " ORDER BY {$options['ORDER BY']}";
}
-
+
if ( isset( $noKeyOptions['DISTINCT'] )
|| isset( $noKeyOptions['DISTINCTROW'] ) )
{
$startOpts .= 'DISTINCT';
}
-
+
return array( $startOpts, '', $preLimitTail, $postLimitTail );
}
-
+
/**
* Returns link to IBM DB2 free download
* @return string wikitext of a link to the server software's web site
public static function getSoftwareLink() {
return "[http://www.ibm.com/db2/express/ IBM DB2]";
}
-
+
/**
* Get search engine class. All subclasses of this
* need to implement this if they wish to use searching.
- *
+ *
* @return String
*/
public function getSearchEngine() {
}
return false;
}
-
+
/**
* Ping the server and try to reconnect if it there is no connection
* The connection may be closed and reopened while this happens
$this->close();
$this->mConn = $this->openUncataloged( $this->mDBName, $this->mUser,
$this->mPassword, $this->mServer, $this->mPort );
-
+
return false;
}
######################################
/**
* Not implemented
* @return string $sql
- */
+ */
public function limitResultForUpdate( $sql, $num ) {
$this->installPrint( 'Not implemented for DB2: limitResultForUpdate()' );
return $sql;
}
-
+
/**
* Only useful with fake prepare like in base Database class
* @return string
$this->installPrint( 'Not useful for DB2: fillPreparedArg()' );
return '';
}
-
+
######################################
# Reflection
######################################
-
+
/**
* Returns information about an index
* If errors are explicitly ignored, returns NULL on failure
}
else return false;
}
-
+
/**
* Returns an information object on a table column
* @param $table String: table name
public function fieldInfo( $table, $field ) {
return IBM_DB2Field::fromText( $this, $table, $field );
}
-
+
/**
* db2_field_type() wrapper
* @param $res Object: result of executed statement
}
return db2_field_type( $res, $index );
}
-
+
/**
* Verifies that an index was created as unique
* @param $table String: table name
return false;
}
-
+
/**
* Returns the size of a text field, or -1 for "unlimited"
* @param $table String: table name
$size = $row->size;
return $size;
}
-
+
/**
* DELETE where the condition is a join
* @param $delTable String: deleting from this table
$conds, $fname = "DatabaseIbm_db2::deleteJoin" )
{
if ( !$conds ) {
- throw new DBUnexpectedError( $this,
+ throw new DBUnexpectedError( $this,
'Database::deleteJoin() called with empty $conds' );
}
$sql = <<<SQL
DELETE FROM $delTable
WHERE $delVar IN (
- SELECT $joinVar FROM $joinTable
-
+ SELECT $joinVar FROM $joinTable
+
SQL;
if ( $conds != '*' ) {
$sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
public function encodeBlob( $b ) {
return new IBM_DB2Blob( $b );
}
-
+
/**
* Description is left as an exercise for the reader
* @param $b IBM_DB2Blob: data to be decoded
public function decodeBlob( $b ) {
return "$b";
}
-
+
/**
* Convert into a list of string being concatenated
* @param $stringList Array: strings that need to be joined together
// Sample query: VALUES 'foo' CONCAT 'bar' CONCAT 'baz'
return implode( ' || ', $stringList );
}
-
+
/**
* Generates the SQL required to convert a DB2 timestamp into a Unix epoch
* @param $column String: name of timestamp column
// TODO
// see SpecialAncientpages
}
-
+
######################################
# Prepared statements
######################################
-
+
/**
* Intended to be compatible with the PEAR::DB wrapper functions.
* http://pear.php.net/manual/en/package.database.db.intro-execute.php
public function fillPrepared( $preparedQuery, $args ) {
reset( $args );
$this->preparedArgs =& $args;
-
+
foreach ( $args as $i => $arg ) {
db2_bind_param( $preparedQuery, $i+1, $args[$i] );
}
-
+
return $preparedQuery;
}
-
+
/**
* Switches module between regular and install modes
*/
$this->mMode = $mode;
return $old;
}
-
+
/**
* Bitwise negation of a column or value in SQL
* Same as (~field) in C
if ( !is_array( $maybeArray ) ) {
return array( $maybeArray );
}
-
+
return $maybeArray;
}
}
dépôts / lhc / web / wiklou.git / commitdiff