Modified how to send stream data using SQLPutData and SQLParamData

Dockerfile-msphpsql

@@ -44,8 +44,10 @@ RUN curl https://packages.microsoft.com/config/ubuntu/16.04/prod.list > /etc/apt
 RUN export DEBIAN_FRONTEND=noninteractive && apt-get update && ACCEPT_EULA=Y apt-get install -y msodbcsql17 mssql-tools
 ENV PATH="/opt/mssql-tools/bin:${PATH}"	
 
-#install coveralls
-RUN python -m pip install --upgrade pip && pip install cpp-coveralls
+#install coveralls (upgrade both pip and requests first)
+RUN python -m pip install --upgrade pip
+RUN python -m pip install --upgrade requests
+RUN python -m pip install cpp-coveralls
 
 #Either Install git / download zip (One can see other strategies : https://ryanfb.github.io/etc/2015/07/29/git_strategies_for_docker.html )
 #One option is to get source from zip file of repository.

source/shared/core_sqlsrv.h

@@ -1939,9 +1939,10 @@ namespace core {
 
     inline void check_for_mars_error( _Inout_ sqlsrv_stmt* stmt, _In_ SQLRETURN r TSRMLS_DC )
     {
+        // Skip this if not SQL_ERROR - 
         // We check for the 'connection busy' error caused by having MultipleActiveResultSets off
         // and return a more helpful message prepended to the ODBC errors if that error occurs
-        if( !SQL_SUCCEEDED( r )) {
+        if (r == SQL_ERROR) {
 
             SQLCHAR err_msg[SQL_MAX_MESSAGE_LENGTH + 1] = {'\0'};
             SQLSMALLINT len = 0;

source/shared/core_stmt.cpp

@@ -1298,15 +1298,15 @@ bool core_sqlsrv_send_stream_packet( _Inout_ sqlsrv_stmt* stmt TSRMLS_DC )
     php_stream* param_stream = NULL;
     core::sqlsrv_php_stream_from_zval_no_verify( *stmt, param_stream, stmt->current_stream.stream_z TSRMLS_CC );
 
-    // if we're at the end, then release our current parameter
-    if( php_stream_eof( param_stream )) {
-        // if no data was actually sent prior, then send a NULL
-        if( stmt->current_stream_read == 0 ) {
-            // send an empty string, which is what a 0 length does.
-            char buff[1];       // temp storage to hand to SQLPutData
-            core::SQLPutData( stmt, buff, 0 TSRMLS_CC );
+    // if we're at the end, then reset both current_stream and current_stream_read
+    if (php_stream_eof(param_stream)) {
+        // yet return to the very beginning of param_stream since SQLParamData() may ask for the same data again
+        int ret = php_stream_seek(param_stream, 0, SEEK_SET);
+        if (ret != 0) {
+            LOG(SEV_ERROR, "PHP stream: stream seek failed.");
+            throw core::CoreException();
         }
-        stmt->current_stream = sqlsrv_stream( NULL, SQLSRV_ENCODING_CHAR );
+        stmt->current_stream = sqlsrv_stream(NULL, SQLSRV_ENCODING_CHAR);
         stmt->current_stream_read = 0;
     }
     // read the data from the stream, send it via SQLPutData and track how much we've sent.
@@ -1322,7 +1322,12 @@ bool core_sqlsrv_send_stream_packet( _Inout_ sqlsrv_stmt* stmt TSRMLS_DC )
 		}
 
         stmt->current_stream_read += static_cast<unsigned int>( read );
-        if( read > 0 ) {
+        if (read == 0) {
+            // send an empty string, which is what a 0 length does.
+            char buff[1];       // temp storage to hand to SQLPutData
+            core::SQLPutData(stmt, buff, 0 TSRMLS_CC);
+        }
+        else if (read > 0) {
             // if this is a UTF-8 stream, then we will use the UTF-8 encoding to determine if we're in the middle of a character
             // then read in the appropriate number more bytes and then retest the string.  This way we try at most to convert it
             // twice.

test/functional/pdo_sqlsrv/MsData_PDO_AllTypes.inc

@@ -12,7 +12,7 @@
 $int_col = array(1, 2);
 
 $bin = fopen('php://memory', 'a');
-fwrite($bin, '00');
+fwrite($bin, hex2bin('6162636465'));    // 'abcde'
 rewind($bin);
 $binary_col = array($bin, $bin);
 

test/functional/pdo_sqlsrv/pdostatement_bindParam_empty_binary.phpt

@@ -0,0 +1,93 @@
+--TEST--
+PDOStatement::BindParam for binary types with empty strings and non-empty ones  
+--DESCRIPTION--
+PDOStatement::BindParam for binary types with empty strings and non-empty ones 
+Related to GitHub PR 865 - verify that the same binary data can be reused rather
+than flushed after the first use
+--SKIPIF--
+<?php require('skipif_mid-refactor.inc'); ?>
+--FILE--
+<?php
+require_once("MsCommon_mid-refactor.inc");
+
+try {
+    $conn = connect();
+    $tableName = "pdoEmptyBinary";
+    $size = 6;
+
+    $colMetaArr = array(new ColumnMeta("binary($size)", "BinaryCol"), 
+                        new ColumnMeta("varbinary($size)", "VarBinaryCol"),
+                        new ColumnMeta("varbinary(max)", "VarBinaryMaxCol"));
+    createTable($conn, $tableName, $colMetaArr);
+
+    // Insert two rows, first empty strings and the second not empty
+    $inputs = array('', 'ABC');
+    $data = array(bin2hex($inputs[0]), bin2hex($inputs[1]));
+
+    $bin = fopen('php://memory', 'a');
+    fwrite($bin, hex2bin($data[0]));         // an empty string
+    rewind($bin);
+
+    $query = "INSERT INTO $tableName VALUES(?, ?, ?)";
+    $stmt = $conn->prepare($query);
+    $stmt->bindParam(1, $bin, PDO::PARAM_LOB, 0, PDO::SQLSRV_ENCODING_BINARY);
+    $stmt->bindParam(2, $bin, PDO::PARAM_LOB, 0, PDO::SQLSRV_ENCODING_BINARY);
+    $stmt->bindParam(3, $bin, PDO::PARAM_LOB, 0, PDO::SQLSRV_ENCODING_BINARY);
+
+    $stmt->execute();
+    fclose($bin);
+
+    $bin2 = fopen('php://memory', 'a');
+    fwrite($bin2, hex2bin($data[1]));        // 'ABC'
+    rewind($bin2);
+
+    $stmt->bindParam(1, $bin2, PDO::PARAM_LOB, 0, PDO::SQLSRV_ENCODING_BINARY);
+    $stmt->bindParam(2, $bin2, PDO::PARAM_LOB, 0, PDO::SQLSRV_ENCODING_BINARY);
+    $stmt->bindParam(3, $bin2, PDO::PARAM_LOB, 0, PDO::SQLSRV_ENCODING_BINARY);
+
+    $stmt->execute();
+    fclose($bin2);
+
+    // Verify the data by fetching and comparing against the inputs
+    $query = "SELECT * FROM $tableName";
+    $stmt = $conn->query($query);
+    $rowset = $stmt->fetchAll();
+
+    for ($i = 0; $i < 2; $i++) {
+        for ($j = 0; $j < 3; $j++) {
+            $str = $rowset[$i][$j];
+            $len = strlen($str);
+            $failed = false;
+
+            if ($j == 0) {
+                // binary fields have fixed size, unlike varbinary ones
+                if ($len !== $size || trim($str) !== $inputs[$i]) {
+                    $failed = true;
+                }
+            } else {
+                if ($len !== strlen($inputs[$i]) || $str !== $inputs[$i]) {
+                    $failed = true;
+                }
+            }
+
+            if ($failed) {
+                $row = $i + 1;
+                $col = $j + 1;
+                echo "Unexpected value returned from row $row and column $col: \n";
+                var_dump($str);
+            }
+        }
+    } 
+
+    dropTable($conn, $tableName);
+    unset($stmt);
+    unset($conn);
+
+    echo "Done\n";
+} catch (PDOException $e) {
+    var_dump($e);
+    exit;
+}
+?>
+--EXPECT--
+Done

test/functional/sqlsrv/test_largeData.phpt

@@ -42,6 +42,12 @@ class my_stream {
 
     function stream_seek($offset, $whence)
     {
+        // For the purpose of this test only support SEEK_SET to $offset 0
+        if ($whence == SEEK_SET && $offset == 0) {
+            $this->total_read = $offset;
+            return true;
+        } 
+        return false;
     }
 }