}
}
+/**
+ * Wrapper to address lack of certain operations in the DB2 driver
+ * ( seek, num_rows )
+ * @ingroup Database
+ * @since 1.19
+ */
+class IBM_DB2Result{
+ private $db;
+ private $result;
+ private $num_rows;
+ private $current_pos;
+ private $columns = array();
+ private $sql;
+
+ private $resultSet = array();
+ private $loadedLines = 0;
+
+ /**
+ * Construct and initialize a wrapper for DB2 query results
+ * @param $db Database
+ * @param $result Object
+ * @param $num_rows Integer
+ * @param $sql String
+ * @param $columns Array
+ */
+ public function __construct( $db, $result, $num_rows, $sql, $columns ){
+ $this->db = $db;
+
+ if( $result instanceof ResultWrapper ){
+ $this->result = $result->result;
+ }
+ else{
+ $this->result = $result;
+ }
+
+ $this->num_rows = $num_rows;
+ $this->current_pos = 0;
+ if ( $this->num_rows > 0 ) {
+ // Make a lower-case list of the column names
+ // By default, DB2 column names are capitalized
+ // while MySQL column names are lowercase
+
+ // Is there a reasonable maximum value for $i?
+ // Setting to 2048 to prevent an infinite loop
+ for( $i = 0; $i < 2048; $i++ ) {
+ $name = db2_field_name( $this->result, $i );
+ if ( $name != false ) {
+ continue;
+ }
+ else {
+ return false;
+ }
+
+ $this->columns[$i] = strtolower( $name );
+ }
+ }
+
+ $this->sql = $sql;
+ }
+
+ /**
+ * Unwrap the DB2 query results
+ * @return mixed Object on success, false on failure
+ */
+ public function getResult() {
+ if ( $this->result ) {
+ return $this->result;
+ }
+ else return false;
+ }
+
+ /**
+ * Get the number of rows in the result set
+ * @return integer
+ */
+ public function getNum_rows() {
+ return $this->num_rows;
+ }
+
+ /**
+ * Return a row from the result set in object format
+ * @return mixed Object on success, false on failure.
+ */
+ public function fetchObject() {
+ if ( $this->result
+ && $this->num_rows > 0
+ && $this->current_pos >= 0
+ && $this->current_pos < $this->num_rows )
+ {
+ $row = $this->fetchRow();
+ $ret = new stdClass();
+
+ foreach ( $row as $k => $v ) {
+ $lc = $this->columns[$k];
+ $ret->$lc = $v;
+ }
+ return $ret;
+ }
+ return false;
+ }
+
+ /**
+ * Return a row form the result set in array format
+ * @return mixed Array on success, false on failure
+ * @throws DBUnexpectedError
+ */
+ public function fetchRow(){
+ if ( $this->result
+ && $this->num_rows > 0
+ && $this->current_pos >= 0
+ && $this->current_pos < $this->num_rows )
+ {
+ if ( $this->loadedLines <= $this->current_pos ) {
+ $row = db2_fetch_array( $this->result );
+ $this->resultSet[$this->loadedLines++] = $row;
+ if ( $this->db->lastErrno() ) {
+ throw new DBUnexpectedError( $this->db, 'Error in fetchRow(): '
+ . htmlspecialchars( $this->db->lastError() ) );
+ }
+ }
+
+ if ( $this->loadedLines > $this->current_pos ){
+ return $this->resultSet[$this->current_pos++];
+ }
+
+ }
+ return false;
+ }
+
+ /**
+ * Free a DB2 result object
+ * @throws DBUnexpectedError
+ */
+ public function freeResult(){
+ unset( $this->resultSet );
+ if ( !@db2_free_result( $this->result ) ) {
+ throw new DBUnexpectedError( $this, "Unable to free DB2 result\n" );
+ }
+ }
+}
+
/**
* Primary database interface
* @ingroup Database
protected $mAffectedRows = null;
/** Number of rows returned by last SELECT */
protected $mNumRows = null;
+ /** Current row number on the cursor of the last SELECT */
+ protected $currentRow = 0;
/** Connection config options - see constructor */
public $mConnOptions = array();
public $mStmtOptions = array();
/** Default schema */
- const USE_GLOBAL = 'mediawiki';
+ const USE_GLOBAL = 'get from global';
/** Option that applies to nothing */
const NONE_OPTION = 0x00;
/**
* Returns a unique string representing the wiki on the server
*/
- function getWikiID() {
+ public function getWikiID() {
if( $this->mSchema ) {
return "{$this->mDBname}-{$this->mSchema}";
} else {
}
}
- function getType() {
+ /**
+ * Returns the database software identifieir
+ * @return string
+ */
+ public function getType() {
return 'ibm_db2';
}
- ######################################
- # Setup
- ######################################
-
+ /**
+ * Returns the database connection object
+ * @return Object
+ */
+ public function getDb(){
+ return $this->mConn;
+ }
/**
*
self::STMT_OPTION );
$this->setDB2Option( 'rowcount', 'DB2_ROWCOUNT_PREFETCH_ON',
self::STMT_OPTION );
-
- parent::__construct( $server, $user, $password, $dbName, $flags );
+ parent::__construct( $server, $user, $password, $dbName, DBO_TRX | $flags );
}
/**
* @return a fresh connection
*/
public function open( $server, $user, $password, $dbName ) {
- // Load the port number
- global $wgDBport;
wfProfileIn( __METHOD__ );
- // Load IBM DB2 driver if missing
+ # Load IBM DB2 driver if missing
wfDl( 'ibm_db2' );
- // Test for IBM DB2 support, to avoid suppressed fatal error
+ # Test for IBM DB2 support, to avoid suppressed fatal error
if ( !function_exists( 'db2_connect' ) ) {
- $error = <<<ERROR
-DB2 functions missing, have you enabled the ibm_db2 extension for PHP?
-
-ERROR;
- $this->installPrint( $error );
- $this->reportConnectionError( $error );
+ throw new DBConnectionError( $this, "DB2 functions missing, have you enabled the ibm_db2 extension for PHP?" );
}
- if ( strlen( $user ) < 1 ) {
- return null;
- }
+ global $wgDBport;
// Close existing connection
$this->close();
$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 (?).
- // The strategy is to keep AutoCommit on for that code
- // but switch it off whenever a transaction is begun.
- db2_autocommit( $this->mConn, DB2_AUTOCOMMIT_ON );
-
if ( !$this->mConn ) {
$this->installPrint( "DB connection error\n" );
$this->installPrint(
"Server: $server, Database: $dbName, User: $user, Password: "
. substr( $password, 0, 3 ) . "...\n" );
$this->installPrint( $this->lastError() . "\n" );
- return null;
+ wfProfileOut( __METHOD__ );
+ wfDebug( "DB connection error\n" );
+ wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
+ wfDebug( $this->lastError() . "\n" );
+ throw new DBConnectionError( $this, $this->lastError() );
}
+ // 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->mOpened = true;
$this->applySchema();
* Opens a cataloged database connection, sets mConn
*/
protected function openCataloged( $dbName, $user, $password ) {
- @$this->mConn = db2_pconnect( $dbName, $user, $password );
+ wfSuppressWarnings();
+ $this->mConn = db2_pconnect( $dbName, $user, $password );
+ wfRestoreWarnings();
}
/**
*/
protected function openUncataloged( $dbName, $user, $password, $server, $port )
{
- $str = "DRIVER={IBM DB2 ODBC DRIVER};";
- $str .= "DATABASE=$dbName;";
- $str .= "HOSTNAME=$server;";
- // port was formerly validated to not be 0
- $str .= "PORT=$port;";
- $str .= "PROTOCOL=TCPIP;";
- $str .= "UID=$user;";
- $str .= "PWD=$password;";
-
- @$this->mConn = db2_pconnect( $str, $user, $password );
+ $dsn = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$dbName;CHARSET=UTF-8;HOSTNAME=$server;PORT=$port;PROTOCOL=TCPIP;UID=$user;PWD=$password;";
+ wfSuppressWarnings();
+ $this->mConn = db2_pconnect( $dsn, "", "", array() );
+ wfRestoreWarnings();
}
/**
* The DBMS-dependent part of query()
* @param $sql String: SQL query.
* @return object Result object for fetch functions or false on failure
- * @access private
*/
- /*private*/
- public function doQuery( $sql ) {
+ protected function doQuery( $sql ) {
$this->applySchema();
+ // Needed to handle any UTF-8 encoding issues in the raw sql
+ // Note that we fully support prepared statements for DB2
+ // prepare() and execute() should be used instead of doQuery() whenever possible
+ $sql = utf8_decode( $sql );
+
$ret = db2_exec( $this->mConn, $sql, $this->mStmtOptions );
if( $ret == false ) {
$error = db2_stmt_errormsg();
+
$this->installPrint( "<pre>$sql</pre>" );
$this->installPrint( $error );
throw new DBUnexpectedError( $this, 'SQL error: '
* Queries whether a given table exists
* @return boolean
*/
- public function tableExists( $table ) {
+ public function tableExists( $table, $fname = __METHOD__ ) {
$schema = $this->mSchema;
- $sql = <<< EOF
-SELECT COUNT( * ) FROM SYSIBM.SYSTABLES ST
-WHERE ST.NAME = '$table' AND ST.CREATOR = '$schema'
-EOF;
+
+ $sql = "SELECT COUNT( * ) FROM SYSIBM.SYSTABLES ST WHERE ST.NAME = '" .
+ strtoupper( $table ) .
+ "' AND ST.CREATOR = '" .
+ strtoupper( $schema ) . "'";
$res = $this->query( $sql );
if ( !$res ) {
return false;
}
// If the table exists, there should be one of it
- @$row = $this->fetchRow( $res );
+ $row = $this->fetchRow( $res );
$count = $row[0];
if ( $count == '1' || $count == 1 ) {
return true;
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
- @$row = db2_fetch_object( $res );
+ wfSuppressWarnings();
+ $row = db2_fetch_object( $res );
+ wfRestoreWarnings();
if( $this->lastErrno() ) {
throw new DBUnexpectedError( $this, 'Error in fetchObject(): '
. htmlspecialchars( $this->lastError() ) );
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
- @$row = db2_fetch_array( $res );
- if ( $this->lastErrno() ) {
- throw new DBUnexpectedError( $this, 'Error in fetchRow(): '
- . htmlspecialchars( $this->lastError() ) );
- }
- return $row;
- }
-
- /**
- * 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>';
- } else {
- print ' done</li>';
+ if ( db2_num_rows( $res ) > 0) {
+ wfSuppressWarnings();
+ $row = db2_fetch_array( $res );
+ wfRestoreWarnings();
+ if ( $this->lastErrno() ) {
+ throw new DBUnexpectedError( $this, 'Error in fetchRow(): '
+ . htmlspecialchars( $this->lastError() ) );
}
- $res = $this->sourceFile( "../maintenance/ibm_db2/foreignkeys.sql" );
- if ( $res !== true ) {
- print ' <b>FAILED</b>: ' . htmlspecialchars( $res ) . '</li>';
- } else {
- print '<li>Foreign keys done</li>';
- }
-
- // TODO: populate interwiki links
-
- if ( $this->lastError() ) {
- $this->installPrint(
- 'Errors encountered during table creation -- rolled back' );
- $this->installPrint( 'Please install again' );
- $this->rollback();
- } else {
- $this->commit();
- }
- } catch ( MWException $mwe ) {
- print "<br><pre>$mwe</pre><br>";
+ return $row;
}
+ return false;
}
/**
* Handle reserved keyword replacement in table names
*
* @param $name Object
+ * @param $format String Ignored parameter Default 'quoted'Boolean
* @return String
*/
- public function tableName( $name ) {
+ public function tableName( $name, $format = 'quoted' ) {
// we want maximum compatibility with MySQL schema
return $name;
}
} else {
$sql .= '( ?' . str_repeat( ',?', $key_count-1 ) . ' )';
}
- //$this->installPrint( "Preparing the following SQL:" );
- //$this->installPrint( "$sql" );
- //$this->installPrint( print_r( $args, true ));
+ $this->installPrint( "Preparing the following SQL:" );
+ $this->installPrint( "$sql" );
+ $this->installPrint( print_r( $args, true ));
$stmt = $this->prepare( $sql );
// start a transaction/enter transaction mode
$overhead = "SAVEPOINT $ignore ON ROLLBACK RETAIN CURSORS";
db2_exec( $this->mConn, $overhead, $this->mStmtOptions );
- $this->execute( $stmt, $row );
+ $res2 = $this->execute( $stmt, $row );
if ( !$res2 ) {
$this->installPrint( 'Last error:' );
*/
private function removeNullPrimaryKeys( $table, $args ) {
$schema = $this->mSchema;
+
// find out the primary keys
- $keyres = db2_primary_keys( $this->mConn, null, strtoupper( $schema ),
- strtoupper( $table )
- );
+ $keyres = $this->doQuery( "SELECT NAME FROM SYSIBM.SYSCOLUMNS WHERE TBNAME = '"
+ . strtoupper( $table )
+ . "' AND TBCREATOR = '"
+ . strtoupper( $schema )
+ . "' AND KEYSEQ > 0" );
+
$keys = array();
for (
- $row = $this->fetchObject( $keyres );
+ $row = $this->fetchRow( $keyres );
$row != null;
- $row = $this->fetchObject( $keyres )
+ $row = $this->fetchRow( $keyres )
)
{
- $keys[] = strtolower( $row->column_name );
+ $keys[] = strtolower( $row[0] );
}
// remove primary keys
foreach ( $args as $ai => $row ) {
return db2_num_rows( $this->mLastResult );
}
- /**
- * Simulates REPLACE with a DELETE followed by INSERT
- * @param $table Object
- * @param $uniqueIndexes Array consisting of indexes and arrays of indexes
- * @param $rows Array: rows to insert
- * @param $fname String: name of the function for profiling
- * @return nothing
- */
- function replace( $table, $uniqueIndexes, $rows,
- $fname = 'DatabaseIbm_db2::replace' )
- {
- $table = $this->tableName( $table );
-
- if ( count( $rows )==0 ) {
- return;
- }
-
- # Single row case
- if ( !is_array( reset( $rows ) ) ) {
- $rows = array( $rows );
- }
-
- foreach( $rows as $row ) {
- # Delete rows which collide
- if ( $uniqueIndexes ) {
- $sql = "DELETE FROM $table WHERE ";
- $first = true;
- foreach ( $uniqueIndexes as $index ) {
- if ( $first ) {
- $first = false;
- $sql .= '( ';
- } else {
- $sql .= ' ) OR ( ';
- }
- if ( is_array( $index ) ) {
- $first2 = true;
- foreach ( $index as $col ) {
- if ( $first2 ) {
- $first2 = false;
- } else {
- $sql .= ' AND ';
- }
- $sql .= $col . '=' . $this->addQuotes( $row[$col] );
- }
- } else {
- $sql .= $index . '=' . $this->addQuotes( $row[$index] );
- }
- }
- $sql .= ' )';
- $this->query( $sql, $fname );
- }
-
- # Now insert the row
- $sql = "INSERT INTO $table ( "
- . $this->makeList( array_keys( $row ), LIST_NAMES )
- .' ) VALUES ( ' . $this->makeList( $row, LIST_COMMA ) . ' )';
- $this->query( $sql, $fname );
- }
- }
-
/**
* Returns the number of rows in the result set
* Has to be called right after the corresponding select query
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
+
if ( $this->mNumRows ) {
return $this->mNumRows;
} else {
*/
public function dataSeek( $res, $row ) {
if ( $res instanceof ResultWrapper ) {
- $res = $res->result;
+ return $res = $res->result;
}
- return db2_fetch_row( $res, $row );
+ if ( $res instanceof IBM_DB2Result ) {
+ return $res->dataSeek( $row );
+ }
+ wfDebug( "dataSeek operation in DB2 database\n" );
+ return false;
}
###
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
- if ( !@db2_free_result( $res ) ) {
+ wfSuppressWarnings();
+ $ok = db2_free_result( $res );
+ wfRestoreWarnings();
+ if ( !$ok ) {
throw new DBUnexpectedError( $this, "Unable to free DB2 result\n" );
}
}
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
+ if ( $res instanceof IBM_DB2Result ) {
+ $res = $res->getResult();
+ }
return db2_num_fields( $res );
}
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
+ if ( $res instanceof IBM_DB2Result ) {
+ $res = $res->getResult();
+ }
return db2_field_name( $res, $n );
}
* @param $fname String: calling function name (use __METHOD__)
* for logs/profiling
* @param $options Associative array of options
- * (e.g. array('GROUP BY' => 'page_title')),
+ * (e.g. array( 'GROUP BY' => 'page_title' )),
* see Database::makeSelectOptions code for list of
* supported stuff
* @param $join_conds Associative array of table join conditions (optional)
{
$res = parent::select( $table, $vars, $conds, $fname, $options,
$join_conds );
+ $sql = $this->selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds );
// We must adjust for offset
if ( isset( $options['LIMIT'] ) && isset ( $options['OFFSET'] ) ) {
$res2 = parent::select( $table, $vars2, $conds, $fname, $options2,
$join_conds );
+
$obj = $this->fetchObject( $res2 );
$this->mNumRows = $obj->num_rows;
-
- return $res;
+
+ return new ResultWrapper( $this, new IBM_DB2Result( $this, $res, $obj->num_rows, $vars, $sql ) );
}
/**
######################################
# Unimplemented and not applicable
######################################
- /**
- * Not implemented
- * @return string ''
- */
- public function getStatus( $which = '%' ) {
- $this->installPrint( 'Not implemented for DB2: getStatus()' );
- return '';
- }
/**
* Not implemented
* @return string $sql
if ( $res instanceof ResultWrapper ) {
$res = $res->result;
}
+ if ( $res instanceof IBM_DB2Result ) {
+ $res = $res->getResult();
+ }
return db2_field_type( $res, $index );
}
return $size;
}
- /**
- * DELETE where the condition is a join
- * @param $delTable String: deleting from this table
- * @param $joinTable String: using data from this table
- * @param $delVar String: variable in deleteable table
- * @param $joinVar String: variable in data table
- * @param $conds Array: conditionals for join table
- * @param $fname String: function name for profiling
- */
- public function deleteJoin( $delTable, $joinTable, $delVar, $joinVar,
- $conds, $fname = "DatabaseIbm_db2::deleteJoin" )
- {
- if ( !$conds ) {
- throw new DBUnexpectedError( $this,
- 'DatabaseIbm_db2::deleteJoin() called with empty $conds' );
- }
-
- $delTable = $this->tableName( $delTable );
- $joinTable = $this->tableName( $joinTable );
- $sql = <<<SQL
-DELETE FROM $delTable
-WHERE $delVar IN (
- SELECT $joinVar FROM $joinTable
-
-SQL;
- if ( $conds != '*' ) {
- $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
- }
- $sql .= ' )';
-
- $this->query( $sql, $fname );
- }
-
/**
* Description is left as an exercise for the reader
* @param $b Mixed: data to be encoded
dépôts / lhc / web / wiklou.git / blobdiff