--摘自 《Oracle Pro*C 程序开发》 --Create/Modify Email:xingchengli@gmail.com
SQLDA 的结构如下:
struct SQLDA
{
long N; /* Descriptor size in number of entries */
char **V; Ptr to Arr of addresses of main variables */
long *L; /* Ptr to Arr of lengths of buffers */
short *T; /* Ptr to Arr of types of buffers */
short **I; * Ptr to Arr of addresses of indicator vars */
long F; /* Number of variables found by DESCRIBE */
char **S; /* Ptr to Arr of variable name pointers */
short *M; /* Ptr to Arr of max lengths of var. names */
short *C; * Ptr to Arr of current lengths of var. names */
char **X; /* Ptr to Arr of ind. var. name pointers */
short *Y; /* Ptr to Arr of max lengths of ind. var. names */
short *Z; /* Ptr to Arr of cur lengths of ind. var. names */
};
SQLDA结构成员作用描述:
名称 描述
N SELECT-LIST列或占位符的最大数量,执行DESCRIBE前必须执行
SQLSQLDAAlloc()函数给N进行赋值,设定描述数组的维数,其决定了描述字结构成
员数组的最大元素个