How to retrieve the result status in a PostgreSQL database?
When using the pg database, you can obtain the result status using the following methods:
- Execute SQL query statements using the pg_query() function and store the results in a variable. For example:
$query = pg_query($dbconn, "SELECT * FROM table_name");
- PGSQL_EMPTY_QUERY: The query is empty
- PGSQL_COMMAND_OK: Query was successful.
- PGSQL_TUPLES_OK: The query returns a result set.
- PGSQL_COPY_OUT: Query in COPY OUT mode.
- PGSQL_COPY_IN: operated in COPY IN mode.
- PGSQL_BAD_RESPONSE: Abnormal query result.
For example:
$status = pg_result_status($query);
- Different actions can be taken based on the result status. For example, if the status is PGSQL_TUPLES_OK, it means that the query has returned a result set, and you can use functions like pg_fetch_assoc() or pg_fetch_row() to fetch data from each row.
if ($status === PGSQL_TUPLES_OK) {
while ($row = pg_fetch_assoc($query)) {
// 处理每一行的数据
}
}
The above is a method for operating pg databases in PHP using the pg library. Similar methods for obtaining result status can also be found when operating pg databases with other programming languages.