adodb-db2.inc.php

这是一个嵌入式linux系统下的命令工具包

	{
		switch ((integer)$t) {
		case 1:	
		case 12:
		case 0:
		case -95:
		case -96:
			return 'C';
		case -97:
		case -1: //text
			return 'X';
		case -4: //image
			return 'B';
				
		case 9:	
		case 91:
			return 'D';
		
		case 10:
		case 11:
		case 92:
		case 93:
			return 'T';
			
		case 4:
		case 5:
		case -6:
			return 'I';
			
		case -11: // uniqidentifier
			return 'R';
		case -7: //bit
			return 'L';
		
		default:
			return 'N';
		}
	}
	
	function &MetaColumns($table)
	{
	global $ADODB_FETCH_MODE;
	
		$false = false;
		if ($this->uCaseTables) $table = strtoupper($table);
		$schema = '';
		$this->_findschema($table,$schema);
		
		$savem = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
	
        	$colname = "%";
	        $qid = db2_columns($this->_connectionID, "", $schema, $table, $colname);
		if (empty($qid)) return $false;
		
		$rs =& new ADORecordSet_db2($qid);
		$ADODB_FETCH_MODE = $savem;
		
		if (!$rs) return $false;
		$rs->_fetch();
		
		$retarr = array();
		
		/*
		$rs->fields indices
		0 TABLE_QUALIFIER
		1 TABLE_SCHEM
		2 TABLE_NAME
		3 COLUMN_NAME
		4 DATA_TYPE
		5 TYPE_NAME
		6 PRECISION
		7 LENGTH
		8 SCALE
		9 RADIX
		10 NULLABLE
		11 REMARKS
		*/
		while (!$rs->EOF) {
			if (strtoupper(trim($rs->fields[2])) == $table && (!$schema || strtoupper($rs->fields[1]) == $schema)) {
				$fld = new ADOFieldObject();
				$fld->name = $rs->fields[3];
				$fld->type = $this->DB2Types($rs->fields[4]);
				
				// ref: http://msdn.microsoft.com/library/default.asp?url=/archive/en-us/dnaraccgen/html/msdn_odk.asp
				// access uses precision to store length for char/varchar
				if ($fld->type == 'C' or $fld->type == 'X') {
					if ($rs->fields[4] <= -95) // UNICODE
						$fld->max_length = $rs->fields[7]/2;
					else
						$fld->max_length = $rs->fields[7];
				} else 
					$fld->max_length = $rs->fields[7];
				$fld->not_null = !empty($rs->fields[10]);
				$fld->scale = $rs->fields[8];
				$retarr[strtoupper($fld->name)] = $fld;	
			} else if (sizeof($retarr)>0)
				break;
			$rs->MoveNext();
		}
		$rs->Close(); //-- crashes 4.03pl1 -- why?
		
		if (empty($retarr)) $retarr = false;
		return $retarr;
	}
	
	function Prepare($sql)
	{
		if (! $this->_bindInputArray) return $sql; // no binding
		$stmt = db2_prepare($this->_connectionID,$sql);
		if (!$stmt) {
			// we don't know whether db2 driver is parsing prepared stmts, so just return sql
			return $sql;
		}
		return array($sql,$stmt,false);
	}

	/* returns queryID or false */
	function _query($sql,$inputarr=false) 
	{
	GLOBAL $php_errormsg;
		if (isset($php_errormsg)) $php_errormsg = '';
		$this->_error = '';
		
		if ($inputarr) {
			if (is_array($sql)) {
				$stmtid = $sql[1];
			} else {
				$stmtid = db2_prepare($this->_connectionID,$sql);
	
				if ($stmtid == false) {
					$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
					return false;
				}
			}
			
			if (! db2_execute($stmtid,$inputarr)) {
				if ($this->_haserrorfunctions) {
					$this->_errorMsg = db2_errormsg();
					$this->_errorCode = db2_error();
				}
				return false;
			}
		
		} else if (is_array($sql)) {
			$stmtid = $sql[1];
			if (!db2_execute($stmtid)) {
				if ($this->_haserrorfunctions) {
					$this->_errorMsg = db2_errormsg();
					$this->_errorCode = db2_error();
				}
				return false;
			}
		} else
			$stmtid = db2_exec($this->_connectionID,$sql);
		
		$this->_lastAffectedRows = 0;
		if ($stmtid) {
			if (@db2_num_fields($stmtid) == 0) {
				$this->_lastAffectedRows = db2_num_rows($stmtid);
				$stmtid = true;
			} else {
				$this->_lastAffectedRows = 0;
			}
			
			if ($this->_haserrorfunctions) {
				$this->_errorMsg = '';
				$this->_errorCode = 0;
			} else
				$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
		} else {
			if ($this->_haserrorfunctions) {
				$this->_errorMsg = db2_stmt_errormsg();
				$this->_errorCode = db2_stmt_error();
			} else
				$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';
		}
		return $stmtid;
	}

	/*
		Insert a null into the blob field of the table first.
		Then use UpdateBlob to store the blob.
		
		Usage:
		 
		$conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, null)');
		$conn->UpdateBlob('blobtable','blobcol',$blob,'id=1');
	*/
	function UpdateBlob($table,$column,$val,$where,$blobtype='BLOB')
	{
		return $this->Execute("UPDATE $table SET $column=? WHERE $where",array($val)) != false;
	}
	
	// returns true or false
	function _close()
	{
		$ret = @db2_close($this->_connectionID);
		$this->_connectionID = false;
		return $ret;
	}

	function _affectedrows()
	{
		return $this->_lastAffectedRows;
	}
	
}
	
/*--------------------------------------------------------------------------------------
	 Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordSet_db2 extends ADORecordSet {	
	
	var $bind = false;
	var $databaseType = "db2";		
	var $dataProvider = "db2";
	var $useFetchArray;
	
	function ADORecordSet_db2($id,$mode=false)
	{
		if ($mode === false) {  
			global $ADODB_FETCH_MODE;
			$mode = $ADODB_FETCH_MODE;
		}
		$this->fetchMode = $mode;
		
		$this->_queryID = $id;
	}


	// returns the field object
	function &FetchField($fieldOffset = -1) 
	{
		
		$off=$fieldOffset+1; // offsets begin at 1
		
		$o= new ADOFieldObject();
		$o->name = @db2_field_name($this->_queryID,$off);
		$o->type = @db2_field_type($this->_queryID,$off);
		$o->max_length = db2_field_width($this->_queryID,$off);
		if (ADODB_ASSOC_CASE == 0) $o->name = strtolower($o->name);
		else if (ADODB_ASSOC_CASE == 1) $o->name = strtoupper($o->name);
		return $o;
	}
	
	/* Use associative array to get fields array */
	function Fields($colname)
	{
		if ($this->fetchMode & ADODB_FETCH_ASSOC) return $this->fields[$colname];
		if (!$this->bind) {
			$this->bind = array();
			for ($i=0; $i < $this->_numOfFields; $i++) {
				$o = $this->FetchField($i);
				$this->bind[strtoupper($o->name)] = $i;
			}
		}

		 return $this->fields[$this->bind[strtoupper($colname)]];
	}
	
		
	function _initrs()
	{
	global $ADODB_COUNTRECS;
		$this->_numOfRows = ($ADODB_COUNTRECS) ? @db2_num_rows($this->_queryID) : -1;
		$this->_numOfFields = @db2_num_fields($this->_queryID);
		// some silly drivers such as db2 as/400 and intersystems cache return _numOfRows = 0
		if ($this->_numOfRows == 0) $this->_numOfRows = -1;
	}	
	
	function _seek($row)
	{
		return false;
	}
	
	// speed up SelectLimit() by switching to ADODB_FETCH_NUM as ADODB_FETCH_ASSOC is emulated
	function &GetArrayLimit($nrows,$offset=-1) 
	{
		if ($offset <= 0) {
			$rs =& $this->GetArray($nrows);
			return $rs;
		}
		$savem = $this->fetchMode;
		$this->fetchMode = ADODB_FETCH_NUM;
		$this->Move($offset);
		$this->fetchMode = $savem;
		
		if ($this->fetchMode & ADODB_FETCH_ASSOC) {
			$this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);
		}
		
		$results = array();
		$cnt = 0;
		while (!$this->EOF && $nrows != $cnt) {
			$results[$cnt++] = $this->fields;
			$this->MoveNext();
		}
		
		return $results;
	}
	
	
	function MoveNext() 
	{
		if ($this->_numOfRows != 0 && !$this->EOF) {		
			$this->_currentRow++;
			
			$this->fields = @db2_fetch_array($this->_queryID);
			if ($this->fields) {
				if ($this->fetchMode & ADODB_FETCH_ASSOC) {
					$this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);
				}
				return true;
			}
		}
		$this->fields = false;
		$this->EOF = true;
		return false;
	}	
	
	function _fetch()
	{

		$this->fields = db2_fetch_array($this->_queryID);
		if ($this->fields) {
			if ($this->fetchMode & ADODB_FETCH_ASSOC) {
				$this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);
			}
			return true;
		}
		$this->fields = false;
		return false;
	}
	
	function _close() 
	{
		return @db2_free_result($this->_queryID);		
	}

}
?>