support multi-line sql code generation (#352)

* working multi-line sql generation

* remove unneeded  single double convertor

Author: doron050

CodeGenerator/Generators/QueriesGen.cs

@@ -137,11 +137,31 @@ private IEnumerable<MemberDeclarationSyntax> GetMembersForSingleQuery(Query quer
         if (transformedQueryText == string.Empty)
             return null;
 
+        var memberName = ClassMember.Sql.Name(query.Name);
+        if (transformedQueryText.IndexOfAny(['\r', '\n']) >= 0)
+        {
+            var queryText = transformedQueryText.Replace("\"", "\"\"");
+            var lines = queryText.TrimEnd().Split(["\r\n", "\r", "\n"], StringSplitOptions.None);
+
+            // The indentation of the constant declaration itself. for legacy generation it 8 indents and for modern it 4.
+            string memberIndentPrefix = dbDriver.Options.DotnetFramework.IsDotnetLegacy() ? "        " : "    ";
+            var declaration = $"private const string {memberName} = @\"";
+
+            // We need to calculate the indentation for subsequent lines so they align with the first.
+            // This is based on the member indent, the declaration length, and any leading space on the first SQL line.
+            var firstLineLeadingSpaceCount = lines[0].TakeWhile(char.IsWhiteSpace).Count();
+            var subsequentLineIndent = new string(' ', memberIndentPrefix.Length + declaration.Length + firstLineLeadingSpaceCount);
+
+            var indentedLines = lines.Skip(1).Select(line => subsequentLineIndent + line);
+            var fullQueryString = string.Join(Environment.NewLine, [lines[0], .. indentedLines]);
+
+            return ParseMemberDeclaration(
+                $"{memberIndentPrefix}{declaration}{fullQueryString}\";")!;
+        }
+
         var singleLineQueryText = LongWhitespaceRegex().Replace(transformedQueryText, " ");
         return ParseMemberDeclaration(
-                $"""
-                 private const string {ClassMember.Sql.Name(query.Name)} = "{singleLineQueryText}";
-                 """)!
+                $"""private const string {memberName} = "{singleLineQueryText}";""")!
             .AppendNewLine();
     }
 

examples/MySqlConnectorDapperExample/QuerySql.cs

@@ -92,7 +92,10 @@ public static QuerySql WithTransaction(MySqlTransaction transaction)
         return null;
     }
 
-    private const string ListAuthorsSql = "SELECT id, name, bio FROM authors ORDER BY name LIMIT @limit OFFSET @offset";
+    private const string ListAuthorsSql = @"SELECT id, name, bio 
+                                            FROM authors
+                                            ORDER BY name
+                                            LIMIT @limit OFFSET @offset";
     public readonly record struct ListAuthorsRow(long Id, string Name, string? Bio);
     public readonly record struct ListAuthorsArgs(int Limit, int Offset);
     public async Task<List<ListAuthorsRow>> ListAuthors(ListAuthorsArgs args)
@@ -256,7 +259,8 @@ public async Task<long> CreateAuthorReturnId(CreateAuthorReturnIdArgs args)
         return null;
     }
 
-    private const string GetAuthorByNamePatternSql = "SELECT id, name, bio FROM authors WHERE name LIKE COALESCE(@name_pattern, '%')";
+    private const string GetAuthorByNamePatternSql = @"SELECT id, name, bio FROM authors
+                                                       WHERE name LIKE COALESCE(@name_pattern, '%')";
     public readonly record struct GetAuthorByNamePatternRow(long Id, string Name, string? Bio);
     public readonly record struct GetAuthorByNamePatternArgs(string? NamePattern);
     public async Task<List<GetAuthorByNamePatternRow>> GetAuthorByNamePattern(GetAuthorByNamePatternArgs args)
@@ -297,7 +301,8 @@ public async Task<List<GetAuthorByNamePatternRow>> GetAuthorByNamePattern(GetAut
         }
     }
 
-    private const string DeleteAuthorSql = "DELETE FROM authors WHERE name = @name";
+    private const string DeleteAuthorSql = @"DELETE FROM authors
+                                             WHERE name = @name";
     public readonly record struct DeleteAuthorArgs(string Name);
     public async Task DeleteAuthor(DeleteAuthorArgs args)
     {
@@ -354,7 +359,9 @@ public async Task DeleteAllAuthors()
         }
     }
 
-    private const string UpdateAuthorsSql = "UPDATE authors SET bio = @bio WHERE bio IS NOT NULL";
+    private const string UpdateAuthorsSql = @"UPDATE authors
+                                              SET bio = @bio
+                                              WHERE bio IS NOT NULL";
     public readonly record struct UpdateAuthorsArgs(string? Bio);
     public async Task<long> UpdateAuthors(UpdateAuthorsArgs args)
     {
@@ -509,7 +516,9 @@ public async Task<long> CreateBook(CreateBookArgs args)
         }
     }
 
-    private const string ListAllAuthorsBooksSql = "SELECT authors.id, authors.name, authors.bio, books.id, books.name, books.author_id, books.description FROM authors JOIN books ON authors.id = books.author_id ORDER BY authors.name";
+    private const string ListAllAuthorsBooksSql = @"SELECT authors.id, authors.name, authors.bio, books.id, books.name, books.author_id, books.description 
+                                                    FROM authors JOIN books ON authors.id = books.author_id 
+                                                    ORDER BY authors.name";
     public readonly record struct ListAllAuthorsBooksRow(Author? Author, Book? Book);
     public async Task<List<ListAllAuthorsBooksRow>> ListAllAuthorsBooks()
     {
@@ -547,7 +556,9 @@ public async Task<List<ListAllAuthorsBooksRow>> ListAllAuthorsBooks()
         }
     }
 
-    private const string GetDuplicateAuthorsSql = "SELECT authors1.id, authors1.name, authors1.bio, authors2.id, authors2.name, authors2.bio FROM authors authors1 JOIN authors authors2 ON authors1.name = authors2.name WHERE authors1.id < authors2.id";
+    private const string GetDuplicateAuthorsSql = @"SELECT authors1.id, authors1.name, authors1.bio, authors2.id, authors2.name, authors2.bio
+                                                    FROM authors authors1 JOIN authors authors2 ON authors1.name = authors2.name
+                                                    WHERE authors1.id < authors2.id";
     public readonly record struct GetDuplicateAuthorsRow(Author? Author, Author? Author2);
     public async Task<List<GetDuplicateAuthorsRow>> GetDuplicateAuthors()
     {
@@ -585,7 +596,9 @@ public async Task<List<GetDuplicateAuthorsRow>> GetDuplicateAuthors()
         }
     }
 
-    private const string GetAuthorsByBookNameSql = "SELECT authors.id, authors.name, authors.bio, books.id, books.name, books.author_id, books.description FROM authors JOIN books ON authors.id = books.author_id WHERE books.name = @name";
+    private const string GetAuthorsByBookNameSql = @"SELECT authors.id, authors.name, authors.bio, books.id, books.name, books.author_id, books.description
+                                                     FROM authors JOIN books ON authors.id = books.author_id
+                                                     WHERE books.name = @name";
     public readonly record struct GetAuthorsByBookNameRow(long Id, string Name, string? Bio, Book? Book);
     public readonly record struct GetAuthorsByBookNameArgs(string Name);
     public async Task<List<GetAuthorsByBookNameRow>> GetAuthorsByBookName(GetAuthorsByBookNameArgs args)