更新时间：2024-04-25 GMT+08:00
TYPE
功能描述
定义一个新的数据类型。当运行带有-c选项的ecpg的时候，仅仅标识该命令。
语法格式
TYPE type_name IS ctype
参数说明
type_name
数据类型名称。
ctype
C语言数据类型说明。
示例
EXEC SQL TYPE customer IS
struct
{
varchar name[50];
int phone;
};
EXEC SQL TYPE cust_ind IS
struct ind
{
short name_ind;
short phone_ind;
};
EXEC SQL TYPE c IS char reference;
EXEC SQL TYPE ind IS union { int integer; short smallint; };
EXEC SQL TYPE intarray IS int[AMOUNT];
EXEC SQL TYPE str IS varchar[BUFFERSIZ];
EXEC SQL TYPE string IS char[11];
使用EXEC SQL TYPE的示例（注意以下示例使用时在ecpg预处理阶段需要添加-c参数）：
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
EXEC SQL WHENEVER SQLERROR SQLPRINT;
EXEC SQL TYPE tt IS
struct
{
varchar v[256];
int i;
};
EXEC SQL TYPE tt_ind IS
struct ind {
short v_ind;
short i_ind;
};
int main(void)
{
EXEC SQL BEGIN DECLARE SECTION;
tt t;
tt_ind t_ind;
EXEC SQL END DECLARE SECTION;
EXEC SQL CONNECT TO testdb AS con1;
EXEC SQL SELECT pg_catalog.set_config('search_path', '', false); EXEC SQL COMMIT;
EXEC SQL SELECT current_database(), 256 INTO :t:t_ind LIMIT 1;
printf("t.v = %s\n", t.v.arr);
printf("t.i = %d\n", t.i);
printf("t_ind.v_ind = %d\n", t_ind.v_ind);
printf("t_ind.i_ind = %d\n", t_ind.i_ind);
EXEC SQL DISCONNECT con1;
return 0;
}
该示例输出为：
t.v = testdb t.i = 256 t_ind.v_ind = 0 t_ind.i_ind = 0
父主题： 嵌入式SQL命令
