toJson method
Implementation
String toJson({bool includeTableName = false}) {
String SEP = "\n";
StringBuffer sb = StringBuffer();
sb.write("{ '");
if (includeTableName) sb.write("$table_id.");
sb.write("$fieldName " +
WhereData.getSqlOperatorString(sqlOperator) +
"':'$value' }" +
SEP);
return sb.toString();
}