Fix EXIST handling in regards to line breaks. (#117) (#118)

src/EFCore.Jet.Data/JetCommand.cs

@@ -25,7 +25,7 @@ namespace EntityFrameworkCore.Jet.Data
         private static readonly Regex _outerSelectTopValueRegularExpression = new Regex(@"(?<=^\s*select\s+top\s+)\d+(?=\s)", RegexOptions.IgnoreCase);
         private static readonly Regex _outerSelectSkipValueOrParameterRegularExpression = new Regex(@"(?<=^\s*select)\s+skip\s+(?<SkipValueOrParameter>@\w+|\?|\d+)(?=\s)", RegexOptions.IgnoreCase);
         private static readonly Regex _selectRowCountRegularExpression = new Regex(@"^\s*select\s*@@rowcount\s*;?\s*$", RegexOptions.IgnoreCase);
-        private static readonly Regex _ifStatementRegex = new Regex(@"^\s*if\s*(?<not>not)?\s*exists\s*\((?<sqlCheckCommand>.+)\)\s*then\s*(?<sqlCommand>.*)$", RegexOptions.IgnoreCase);
+        private static readonly Regex _ifStatementRegex = new Regex(@"^\s*if\s*(?<not>not)?\s*exists\s*\((?<sqlCheckCommand>.+)\)\s*then\s*(?<sqlCommand>.*)$", RegexOptions.IgnoreCase | RegexOptions.Singleline);
 
         protected JetCommand(JetCommand source)
         {

test/EFCore.Jet.Data.Tests/ExistsTest.cs

@@ -0,0 +1,38 @@
+using System.Data.Common;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace EntityFrameworkCore.Jet.Data.Tests
+{
+    [TestClass]
+    public class ExistsTest
+    {
+        private const string StoreName = nameof(ExistsTest) + ".accdb";
+
+        private JetConnection _connection;
+
+        [TestInitialize]
+        public void Setup()
+        {
+            _connection = Helpers.CreateAndOpenDatabase(StoreName);
+        }
+
+        [TestCleanup]
+        public void TearDown()
+        {
+            _connection?.Close();
+            Helpers.DeleteDatabase(StoreName);
+        }
+
+        [TestMethod]
+        public void IfExists()
+        {
+            using var command = _connection.CreateCommand(
+                @"IF NOT EXISTS (SELECT * FROM `INFORMATION_SCHEMA.TABLES` WHERE `TABLE_NAME` = '__EFMigrationsHistory') THEN CREATE TABLE `__EFMigrationsHistory` (
+    `MigrationId` varchar(150) NOT NULL,
+    `ProductVersion` varchar(32) NOT NULL,
+    CONSTRAINT `PK___EFMigrationsHistory` PRIMARY KEY (`MigrationId`)
+)");
+            command.ExecuteNonQuery();
+        }
+    }
+}