返回值我们用来判断是否执行成功。sqlite 中帮我们定义了一系列的宏，用来作为返回值：
#define sqlITE_OK 0 /* Successful result */ /* beginning-of-error-codes */ #define sqlITE_ERROR 1 /* sql error or missing database */ #define sqlITE_INTERNAL 2 /* Internal logic error in sqlite */ #define sqlITE_PERM 3 /* Access permission denied */ #define sqlITE_ABORT 4 /* Callback routine requested an abort */ #define sqlITE_BUSY 5 /* The database file is locked */ #define sqlITE_LOCKED 6 /* A table in the database is locked */ #define sqlITE_NOMEM 7 /* A malloc() Failed */ #define sqlITE_READONLY 8 /* Attempt to write a readonly database */ #define sqlITE_INTERRUPT 9 /* Operation terminated by sqlite3_interrupt()*/ #define sqlITE_IOERR 10 /* Some kind of disk I/O error occurred */ #define sqlITE_CORRUPT 11 /* The database disk image is malformed */ #define sqlITE_NOTFOUND 12 /* Unknown opcode in sqlite3_file_control() */ #define sqlITE_FULL 13 /* Insertion Failed because database is full */ #define sqlITE_CANTOPEN 14 /* Unable to open the database file */ #define sqlITE_PROTOCOL 15 /* Database lock protocol error */ #define sqlITE_EMPTY 16 /* Database is empty */ #define sqlITE_SCHEMA 17 /* The database schema changed */ #define sqlITE_TOOBIG 18 /* String or BLOB exceeds size limit */ #define sqlITE_CONSTRAINT 19 /* Abort due to constraint violation */ #define sqlITE_MISMATCH 20 /* Data type mismatch */ #define sqlITE_MISUSE 21 /* Library used incorrectly */ #define sqlITE_NOLFS 22 /* Uses OS features not supported on host */ #define sqlITE_AUTH 23 /* Authorization denied */ #define sqlITE_FORMAT 24 /* Auxiliary database format error */ #define sqlITE_RANGE 25 /* 2nd parameter to sqlite3_bind out of range */ #define sqlITE_NOTADB 26 /* File opened that is not a database file */ #define sqlITE_ROW 100 /* sqlite3_step() has another row ready */ #define sqlITE_DONE 101 /* sqlite3_step() has finished executing */ /* end-of-error-codes */
