What are the arguments of the pqexecparams function?

PQexecParams is supported only in protocol 3.0 and later connections; it will fail when using protocol 2.0. The function arguments are: The connection object to send the command through. The SQL command string to be executed. If parameters are used, they are referred to in the command string as $1 , $2, etc.

How do I create a pre-compiled statement in pqexecprepared?

Prepared statements for use with PQexecPrepared can also be created by executing SQL PREPARE statements. Also, although there is no libpq function for deleting a prepared statement, the SQL DEALLOCATE statement can be used for that purpose. Sends a request to execute a prepared statement with given parameters, and waits for the result.

What do the results of pqexec and pqresult mean?

(See PQdescribePrepared for a means to find out what data types were inferred.) As with PQexec, the result is normally a PGresult object whose contents indicate server-side success or failure. A null result indicates out-of-memory or inability to send the command at all. Use PQerrorMessage to get more information about such errors.

How are multiple queries processed in a single pqexec call?

Multiple queries sent in a single PQexec call are processed in a single transaction, unless there are explicit BEGIN / COMMIT commands included in the query string to divide it into multiple transactions. Note however that the returned PGresult structure describes only the result of the last command executed from the string.

What happens when you modify a buffer in a byte array?

The new buffer will be backed by the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer’s capacity will be array.length, its position will be offset, its limit will be offset + length, and its mark will be undefined.

How to wrap a byte array into a buffer in Java?

The wrap () method of java.nio.ByteBuffer Class is used to wraps a byte array into a buffer. The new buffer will be backed by the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa.