c++ - 获取 typedef 结构数组中的行

Question

我的结构定义如下:

typedef struct{
   int v1;
   int v2;
}INFOS_HND;

INFOS_HND hnd_list[100];

EXEC SQL BEGIN DECLARE SECTION;
   char statement[200];
   int current_row = 0;
EXEC SQL END DECLARE SECTION;

我在 pro C/C++ 中使用此语句。

snprintf(statement, sizeof(statement), "select i1, i2, from table_a");

这是我的 SQL 指令:

EXEC SQL PREPARE SEL_INSTR FROM :statement;
EXEC SQL DECLARE MY_CURSOR CURSOR FOR SEL_INSTR;
EXEC SQL OPEN MY_CURSOR;
EXEC SQL WHENEVER NOT FOUND DO break;
while(1){
   EXEC SQL FETCH MY_CURSOR INTO :hnd_list[current_row].v1, :hnd_list[current_row].v2;
   current_row++;
EXEC SQL CLOSE MY_CURSOR;

编译时，显示以下错误:

PCC-S-02322, found undefined identifier
Semantic error at line 53, column 10, file my_file:
EXEC SQL FETCH MY_CURSOR INTO :hnd_list[current_row].v1;

PCC-S-02327, struct or struct pointer required
Semantic error at line 53, column 10, file my_file:
EXEC SQL FETCH MY_CURSOR INTO :hnd_list[current_row].v1;

PCC-S-02322, found undefined identifier
Semantic error at line 53, column 30, file my_file:
EXEC SQL FETCH MY_CURSOR INTO :hnd_list[current_row].v2;

PCC-S-02327, struct or struct pointer required
Semantic error at line 53, column 30, file my_file:
EXEC SQL FETCH MY_CURSOR INTO :hnd_list[current_row].v2;

Answer 1

类型和变量定义在 PRO*C/C++ DECLARE block 外部声明。所以预编译器无法解析声明。尝试将它们移动到 block 内，如下所示:

EXEC SQL BEGIN DECLARE SECTION;

typedef struct{
   int v1;
   int v2;
}INFOS_HND;

INFOS_HND hnd_list[100];

char statement[200];
int current_row = 0;

EXEC SQL END DECLARE SECTION;