|  | 
| const | SQL_PARAMS_DOLLAR 4 | 
|  | SQL_PARAMS_DOLLAR - Bitmask, indicates $1, $2, ... type parameters are supported by db backend. 
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|  | 
| const | SQL_PARAMS_NAMED 1 | 
|  | SQL_PARAMS_NAMED - Bitmask, indicates :name type parameters are supported by db backend. 
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|  | 
| const | SQL_PARAMS_QM 2 | 
|  | SQL_PARAMS_QM - Bitmask, indicates ? type parameters are supported by db backend. 
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|  | 
| const | SQL_QUERY_AUX 5 | 
|  | SQL_QUERY_AUX - Auxiliary query done by driver, setting connection config, getting table info, etc. 
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|  | 
| const | SQL_QUERY_AUX_READONLY 6 | 
|  | SQL_QUERY_AUX_READONLY - Auxiliary query that can be done using the readonly connection: database parameters, table/index/column lists, if not within transaction/ddl. 
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|  | 
| const | SQL_QUERY_INSERT 2 | 
|  | SQL_QUERY_INSERT - Insert select query, writing. 
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|  | 
| const | SQL_QUERY_SELECT 1 | 
|  | SQL_QUERY_SELECT - Normal select query, reading only. 
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|  | 
| const | SQL_QUERY_STRUCTURE 4 | 
|  | SQL_QUERY_STRUCTURE - Query changing db structure, writing. 
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|  | 
| const | SQL_QUERY_UPDATE 3 | 
|  | SQL_QUERY_UPDATE - Update select query, writing. 
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|  |