Interfaces libpq pqexecparams and the inserting of binary data
The above line shows how we can do it on Debian-based Linux. We create a new role in the PostgreSQL system. The restrictions made in the database and user columns still apply. It is usually not appropriate on a multiuser machine.
This tutorial uses C The program takes a row Id as its argument. In all other examples in this tutorial, we assume the peer or trust authentication mode.
The above line shows how we can do it on Debian-based Linux. In older C programs, we would need to separate this line into two lines. This tutorial uses C
The fifth parameter is a pointer to an array of strings containing parameters. The second parameter is the SQL statement. In this method, the database user name must match the operating system user name.
Passing NULL to the fourth parameter means that the server should figure out the parameter types. SQL statements are put into transactions for data safety and integrity. The PQfname function returns the column name associated with the given column number. We expect an integer value.
The PQerrorMessage returns the most recently generated error message. Our SQL command drops a table if it already exists. SQL statements in a transaction can be either all committed to the database or all rolled back.
The PQexecParams function creates a prepared statement and executes it. In the next section, we are going to show how to start the PostgreSQL database, stop it, and query its status. PostgreSQL operates in the autocommit mode.