SQL Language Guide : 5. Embedded SQL : How Embedded SQL Statements Are Processed
 
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How Embedded SQL Statements Are Processed
Embedded SQL statements are processed by an embedded SQL (ESQL) preprocessor, which converts the ESQL statements into host language source code statements. The resulting statements are calls to a runtime library that provides the interface to Vector (host language statements are not altered by the ESQL preprocessor). After the program has been preprocessed, it must be compiled and linked according to the requirements of the host language.
Note:  More details about using embedded SQL in your host language may be found in the Ingres Embedded SQL Companion Guide.