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;

编译时会显示以下错误：

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块之外声明。因此预编译器无法解析声明。尝试在块内移动它们，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;

获取typedef结构数组中的行

1 个答案: