SqlLockType proper translation for MySql v8.0

Author: alex-kulakov

Orm/Xtensive.Orm.MySql/Sql.Drivers.MySql/v8_0/Translator.cs

@@ -12,6 +12,25 @@ namespace Xtensive.Sql.Drivers.MySql.v8_0
 {
   internal class Translator : v5_7.Translator
   {
+    /// <inheritdoc/>
+    public override void Translate(IOutput output, SqlLockType lockType)
+    {
+      var forShare = lockType.Supports(SqlLockType.Shared);
+      var forUpdate = lockType.SupportsAny(SqlLockType.Update | SqlLockType.Exclusive);
+
+      if (!forShare && !forUpdate) {
+        throw new NotSupportedException($"Lock '{lockType.ToString(true)}' is not supported.");
+      }
+
+      _ = output
+        .Append(forShare ? "FOR SHARE" : "FOR UPDATE")
+        .Append(lockType.Supports(SqlLockType.SkipLocked)
+          ? " SKIP LOCKED"
+          : lockType.Supports(SqlLockType.ThrowIfLocked)
+            ? " NOWAIT"
+            : string.Empty);
+    }
+
     // Constructors
 
     public Translator(SqlDriver driver)

Orm/Xtensive.Orm/Sql/Dml/Extensions.cs

@@ -33,6 +33,11 @@ public static bool Supports(this SqlLockType available, SqlLockType required)
       return (available & required)==required;
     }
 
+    public static bool SupportsAny(this SqlLockType available, SqlLockType required)
+    {
+      return (available | required) == required;
+    }
+
     public static string ToString(this SqlLockType lockType, bool humanReadable)
     {
       if (!humanReadable)