Help Center/ GaussDB/ Developer Guide(Centralized_8.x)/ Application Development Guide/ Development Based on libpq/ libpq Interface Reference/ Database Statement Execution Functions/ PQexec
Updated on 2024-06-03 GMT+08:00
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PQexec

Function

Commits a command to the server and waits for the result.

Prototype

PGresult* PQexec(PGconn* conn, const char* query);

Parameter

Table 1 PQexec parameters

Keyword

Parameter Description

conn

Points to the object pointer that contains the connection information.

command

Query string to be executed.

Return Value

PGresult indicates the object pointer that contains the query result.

Precautions

The PQresultStatus function should be called to check the return value for any errors (including the value of a null pointer, in which PGRES_FATAL_ERROR will be returned). The PQerrorMessage function can be called to obtain more information about such errors.

The command string can contain multiple SQL commands separated by semicolons (;). Multiple queries sent in a PQexec call are processed in one transaction, unless there are specific BEGIN/COMMIT commands in the query string to divide the string into multiple transactions. Note that the returned PGresult structure describes only the result of the last command executed from the string. If a command fails, the string processing stops and the returned PGresult describes the error condition.

Example

For details, see Example.