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Client APIs and toolsYou can use the HCL Informix® implementation of client APIs to develop applications for Informix® database servers.
ESQL/C GuideThe Informix® ESQL/C Programmer's Manual explains how to use Informix® ESQL/C, the Informix® implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
Database server communication
Working with the database serverThese topics explain how the Informix® ESQL/C program can interact with a database server.
The client-server connectionThe Informix® ESQL/C application can establish a connection to any valid database environment. A database environment can be a database, a database server, or a database and a database server.
Connect to a database server

Connect to a database server

When the Informix® ESQL/C application begins execution, it has no connections to any database server. For SQL statements to execute, however, such a connection must exist. To establish a connection to a database server, the Informix ESQL/C program must take the following actions:

Use an SQL statement to establish a connection to the database server
Specify, in the SQL statement, the name of the database server to which to connect

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