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我想刪除使用libpq PQexecParams()函數的記錄。查詢成功返回,但所需行不會從表中刪除。這裏是我的代碼片段供參考。我已經使用PQexecParams()進行選擇併成功插入。你能幫忙嗎,我錯過了什麼!刪除記錄使用libpq PQexecParams()查詢
PGresult *res;
int meter_info_id;
printf ("Enter Meter Information Id");
scanf("%d", &meter_info_id);
char *stm_write_reg = "delete from write_reg_set where meter_id=$1";
int nparam = 1;
//set the values to use
const char *values[1] = {(char *)&meter_info_id};
//calculate the lengths of each of the values
int lengths[1] = {sizeof(meter_info_id)};
//state which parameters are binary
int binary[1] = {1};
res = PQexecParams(conn,
stm_write_reg,
nparam, //number of parameters
NULL, //ignore the Oid field
values, //values to substitute $1 and $2 and so on
lengths, //the lengths, in bytes, of each of the parameter values
binary, //whether the values are binary or not
0); //we want the result in text format
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "stm_write_reg failed: %s", PQerrorMessage(conn));
exit_nicely(conn,res);
}
PQclear(res);