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| ### Flowchart of `MySQL_Connection::async_query()` | ||
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| This function asynchronously executes a query on the MySQL connection. | ||
| It handles various states of the asynchronous query execution process and returns appropriate status codes indicating the result of the execution. | ||
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| Returns an integer status code indicating the result of the query execution: | ||
| - 0: Query execution completed successfully. | ||
| - -1: Query execution failed. | ||
| - 1: Query execution in progress. | ||
| - 2: Processing a multi-statement query, control needs to be transferred to MySQL_Session. | ||
| - 3: In the middle of processing a multi-statement query. | ||
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| ```mermaid | ||
| --- | ||
| title: MySQL_Connection::async_query() | ||
| --- | ||
| flowchart TD | ||
| Assert["assert()"] | ||
| ValidConnection{Valid Connection} | ||
| ValidConnection -- no --> Assert | ||
| IsServerOffline{"IsServerOffline()"} | ||
| ValidConnection -- yes --> IsServerOffline | ||
| IsServerOffline -- yes --> ReturnMinus1 | ||
| asyncStateMachine1{async_state_machine} | ||
| asyncStateMachine2{async_state_machine} | ||
| IsServerOffline -- no --> asyncStateMachine1 | ||
| asyncStateMachine1 -- ASYNC_QUERY_END --> Return0 | ||
| handler["handler()"] | ||
| asyncStateMachine1 --> handler | ||
| handler --> asyncStateMachine2 | ||
| asyncStateMachine2 -- ASYNC_QUERY_END --> mysql_error{"mysql_error"} | ||
| asyncStateMachine2 -- ASYNC_STMT_EXECUTE_END --> mysql_error | ||
| asyncStateMachine2 -- ASYNC_STMT_PREPARE_FAILED --> ReturnMinus1 | ||
| asyncStateMachine2 -- ASYNC_STMT_PREPARE_SUCCESSFUL --> Return0 | ||
| mysql_error -- yes --> ReturnMinus1 | ||
| mysql_error -- no --> Return0 | ||
| asyncStateMachine2 -- ASYNC_NEXT_RESULT_START --> Return2 | ||
| processing_multi_statement{"processing_multi_statement"} | ||
| asyncStateMachine2 --> processing_multi_statement | ||
| processing_multi_statement -- yes --> Return3 | ||
| processing_multi_statement -- no --> Return1 | ||
| ReturnMinus1["return -1"] | ||
| Return0["return 0"] | ||
| Return1["return 1"] | ||
| Return2["return 2"] | ||
| Return3["return 3"] | ||
| ``` | ||
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| ### Flowchart of `MySQL_Connection::IsServerOffline()` | ||
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| ```mermaid | ||
| --- | ||
| title: MySQL_Connection::IsServerOffline() | ||
| --- | ||
| flowchart TD | ||
| True[true] | ||
| False[false] | ||
| SS1{"server_status"} | ||
| SA{"shunned_automatic"} | ||
| SB{"shunned_and_kill_all_connections"} | ||
| SS1 -- OFFLINE_HARD --> True | ||
| SS1 -- REPLICATION_LAG --> True | ||
| SS1 -- SHUNNED --> SA | ||
| SA -- yes --> SB | ||
| SB -- yes --> True | ||
| SA -- no --> False | ||
| SB -- no --> False | ||
| SS1 --> False | ||
| ``` |
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| ### Flowchart of `MySQL_Session::RunQuery()` | ||
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| This function mostly calls `MySQL_Connection::async_query()` with the right arguments. | ||
| Returns an integer status code indicating the result of the query execution: | ||
| - 0: Query execution completed successfully. | ||
| - -1: Query execution failed. | ||
| - 1: Query execution in progress. | ||
| - 2: Processing a multi-statement query, control needs to be transferred to MySQL_Session. | ||
| - 3: In the middle of processing a multi-statement query. | ||
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| ```mermaid | ||
| --- | ||
| title: MySQL_Session::RunQuery() | ||
| --- | ||
| flowchart TD | ||
| RQ["MySQL_Connection::async_query()"] | ||
| BEGIN --> RQ | ||
| RQ --> END | ||
| ``` | ||
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| ### Flowchart of `MySQL_Session::handler()` | ||
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| WORK IN PROGRESS | ||
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| ```mermaid | ||
| --- | ||
| title: MySQL_Session::handler() | ||
| --- | ||
| flowchart TD | ||
| RQ["rc = RunQuery()"] | ||
| RC{rc} | ||
| CBCS["rc1 = handler_ProcessingQueryError_CheckBackendConnectionStatus()"] | ||
| RC1{rc1} | ||
| RQ --> RC | ||
| RC -- 0 --> OK | ||
| RC -- -1 --> CBCS | ||
| CBCS --> RC1 | ||
| CS["CONNECTING_SERVER"] | ||
| ReturnMinus1["return -1"] | ||
| RC1 -- -1 --> ReturnMinus1 | ||
| RC1 -- 1 --> CS | ||
| HM1CLE1["handler_minus1_ClientLibraryError()"] | ||
| HM1CLE2["handler_minus1_ClientLibraryError()"] | ||
| myerr1{"myerr >= 2000 | ||
| && | ||
| myerr < 3000"} | ||
| RC1 --> myerr1 | ||
| myerr1 -- yes --> HM1CLE1 | ||
| HM1CLE1 -- true --> CS | ||
| HM1CLE1 -- false --> ReturnMinus1 | ||
| HM1LEDQ1["handler_minus1_LogErrorDuringQuery()"] | ||
| myerr1 -- no --> HM1LEDQ1 | ||
| HM1HEC1["handler_minus1_HandleErrorCodes()"] | ||
| HM1LEDQ1 --> HM1HEC1 | ||
| HM1HEC1 -- true --> HR1{"handler_ret"} | ||
| HR1 -- 0 --> CS | ||
| HR1 --> RHR1["return handler_ret"] | ||
| HM1GEM1["handler_minus1_GenerateErrorMessage()"] | ||
| HM1HEC1 -- false --> HM1GEM1 | ||
| RE["RequestEnd()"] | ||
| HM1HBC1["handler_minus1_HandleBackendConnection()"] | ||
| HM1GEM1 --> RE | ||
| RE --> HM1HBC1 | ||
| ``` | ||
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| ### Flowchart of `MySQL_Session::handler_ProcessingQueryError_CheckBackendConnectionStatus()` | ||
| TODO |
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