Range API needs size_t for .length.

database.d

@@ -147,7 +147,7 @@ interface ResultSet {
 	bool empty() @property;
 	Row front() @property;
 	void popFront() ;
-	int length() @property;
+	size_t length() @property;
 
 	/* deprecated */ final ResultSet byAssoc() { return this; }
 }

mssql.d

@@ -111,7 +111,7 @@ class MsSqlResult : ResultSet {
 			fetchNext;
 	}
 
-	int length()
+	override size_t length()
 	{
 		return 1; //FIX ME
 	}

mysql.d

@@ -72,7 +72,7 @@ class MySqlResult : ResultSet {
 	}
 
 
-	override int length() {
+	override size_t length() {
 		if(result is null)
 			return 0;
 		return cast(int) mysql_num_rows(result);

postgres.d

@@ -126,7 +126,7 @@ class PostgresResult : ResultSet {
 			fetchNext();
 	}
 
-	int length() {
+	override size_t length() {
 		return numRows;
 	}
 

sqlite.d

@@ -227,8 +227,8 @@ class SqliteResult :  ResultSet {
 		position++;
 	}
 
-	int length() {
+	override size_t length() {
-		return cast(int) rows.length;
+		return rows.length;
 	}
 
 	this(Variant[][] rows, char[][] columnNames) {