Add support for data type sql_variant

source/shared/core_stmt.cpp

@@ -1432,6 +1432,7 @@ void calc_string_size( sqlsrv_stmt* stmt, SQLUSMALLINT field_index, SQLLEN sql_t
             case SQL_TYPE_DATE:
             case SQL_SS_TIME2:
             case SQL_SS_TIMESTAMPOFFSET:
+            case SQL_SS_VARIANT:
             {
                 // unixODBC 2.3.1 requires wide calls to support pooling
                 core::SQLColAttributeW( stmt, field_index + 1, SQL_DESC_DISPLAY_SIZE, NULL, 0, NULL, &size TSRMLS_CC );
@@ -1449,7 +1450,7 @@ void calc_string_size( sqlsrv_stmt* stmt, SQLUSMALLINT field_index, SQLLEN sql_t
             }
 
             default:
-                DIE ( "Unexpected SQL type encountered in calc_string_size." );
+                DIE ( "Unexpected SQL type encountered in calc_string_size. sql_type = %1!d!", sql_type );
         }
     }
     catch( core::CoreException& e ) {

test/sqlsrv/bug_127.phpt

@@ -0,0 +1,67 @@
+--TEST--
+Bug #127 (sqlsrv: data type sql_variant is unsupported)
+--SKIPIF--
+<?php if(!extension_loaded("sqlsrv")) print "skip"; ?>
+--INI--
+--FILE--
+<?php
+require('config.inc');
+
+$conn = sqlsrv_connect($serverName, ['Database' => $database, 'Uid' => $username, 'PWD' => $password]);
+print 'sqlsrv connection successfull: '.($conn !== false ? 'yes' : 'no').PHP_EOL;
+
+function build_sql($value) {
+    // See https://msdn.microsoft.com/en-us/library/ms178550.aspx
+    $properties= ['BaseType', 'Precision', 'Scale', 'TotalBytes', 'Collation', 'MaxLength'];
+
+    $sql = "DECLARE @v1 sql_variant; SET @v1 = {$value}; ";
+    $sql .= "SELECT @v1 as Value";
+    foreach ($properties as $property) {
+        $sql .=  ", SQL_VARIANT_PROPERTY(@v1, '{$property}') as {$property}";
+    }
+    $sql .= ";";
+
+    return $sql;
+}
+
+function test_variant_type($conn, $type, $value) {
+    $result = sqlsrv_query($conn, build_sql($value));
+    print 'sqlsrv query successfull: '.($result !== false ? 'yes' : 'no').PHP_EOL;
+
+    $row = sqlsrv_fetch_array($result, SQLSRV_FETCH_ASSOC);
+    print 'sql_variant ' . $type . ' php type: ' . gettype($row['Value']) . PHP_EOL;
+    print 'sql_variant ' . $type . ' value: ' . $row['Value'] . PHP_EOL;
+    print 'sql_variant ' . $type . ' base type: ' . $row['BaseType'] . PHP_EOL;
+    print 'sql_variant ' . $type . ' precision: ' . $row['Precision'] . PHP_EOL;
+    print 'sql_variant ' . $type . ' scale: ' . $row['Scale'] . PHP_EOL;
+    print 'sql_variant ' . $type . ' total bytes: ' . $row['TotalBytes'] . PHP_EOL;
+    print 'sql_variant ' . $type . ' collation: ' . $row['Collation'] . PHP_EOL;
+    print 'sql_variant ' . $type . ' max length: ' . $row['MaxLength'] . PHP_EOL;
+
+    sqlsrv_free_stmt($result);
+}
+
+test_variant_type($conn, 'string', "'ABC'");
+test_variant_type($conn, 'float', "cast (46279.1 as decimal(8,2))");
+
+?>
+--EXPECT--
+sqlsrv connection successfull: yes
+sqlsrv query successfull: yes
+sql_variant string php type: string
+sql_variant string value: ABC
+sql_variant string base type: varchar
+sql_variant string precision: 0
+sql_variant string scale: 0
+sql_variant string total bytes: 11
+sql_variant string collation: SQL_Latin1_General_CP1_CI_AS
+sql_variant string max length: 3
+sqlsrv query successfull: yes
+sql_variant float php type: string
+sql_variant float value: 46279.10
+sql_variant float base type: decimal
+sql_variant float precision: 8
+sql_variant float scale: 2
+sql_variant float total bytes: 9
+sql_variant float collation: 
+sql_variant float max length: 5