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-module(mongoose_rdbms_timestamp). |
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-export([prepare/0, |
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select/0]). |
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-spec prepare() -> ok. |
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prepare() -> |
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mongoose_rdbms:prepare(mim_timestamp, users, [], select_query()), |
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ok. |
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select_query() -> |
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case {mongoose_rdbms:db_engine(global), mongoose_rdbms:db_type()} of |
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{mysql, _} -> |
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<<"SELECT UNIX_TIMESTAMP()">>; |
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{pgsql, _} -> |
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:-( |
<<"SELECT CAST(extract(epoch from now()) AS integer)">>; |
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{odbc, mssql} -> |
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:-( |
<<"SELECT DATEDIFF_BIG(second, '1970-01-01 00:00:00', GETUTCDATE())">>; |
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Other -> |
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:-( |
error({prepare_timestamp_query_failed, Other}) |
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end. |
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-spec select() -> integer(). |
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select() -> |
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Res = mongoose_rdbms:execute_successfully(global, mim_timestamp, []), |
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mongoose_rdbms:selected_to_integer(Res). %% ensure it is an integer |