C语言中mysql_query（）函数的返回值是什么？

liangchaoxi 2013-12-23 08:04:37

C语言中mysql_query（）函数当里面执行的SELECT 语句时，返回值是什么？我知道不是执行SELECT \SHOW 语句的时候成功返回0 失败返回非零，在PHP中执行SELECT \SHOW 语句的时候成功返回的是MYSQL_RES *。请问C中十分也是？如果不是，执行SELECT \SHOW 语句的时候，如何释放内存？

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ACMAIN_CHM 2013-12-23

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int mysql_query(MYSQL *mysql, const char *stmt_str) 类似这类问题，其实可以直接百度，或者查看MYSQL的官方免费手册。

引用

20.9.3.51. mysql_query() int mysql_query(MYSQL *mysql, const char *stmt_str) Description Executes the SQL statement pointed to by the null-terminated string stmt_str. Normally, the string must consist of a single SQL statement and you should not add a terminating semicolon (“;”) or \g to the statement. If multiple-statement execution has been enabled, the string can contain several statements separated by semicolons. See Section 20.9.12, “C API Support for Multiple Statement Execution”. mysql_query() cannot be used for statements that contain binary data; you must use mysql_real_query() instead. (Binary data may contain the “\0” character, which mysql_query() interprets as the end of the statement string.) If you want to know whether the statement should return a result set, you can use mysql_field_count() to check for this. See Section 20.9.3.22, “mysql_field_count()”. Return Values Zero if the statement was successful. Nonzero if an error occurred. Errors CR_COMMANDS_OUT_OF_SYNC Commands were executed in an improper order. CR_SERVER_GONE_ERROR The MySQL server has gone away. CR_SERVER_LOST The connection to the server was lost during the query. CR_UNKNOWN_ERROR An unknown error occurred.