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Summary
Embedded SQL was the first commercial
solution to extend SQL with the capabilities of a procedural language. It
allows a host-language-written computer program to connect to RDBMS and perform
virtually any SQL operation (retrieve and modify data, create, change, and drop
database objects, grant and revoke privileges, etc.).Dynamic SQL is a logical extension to the
embedded (static) SQL that enables you to build and execute SQL statements in
runtime.Dynamic DML and DDL statements are
relatively simple to implement because they do not have to return data back to
the host program. Dynamic query standards are more complex and difficult to
implement. Most modern programming languages delegate their implementation
complexities to the internal mechanisms of the programming language — thus
sparing the programmers.Even though most sources say that dynamic
SQL is generally less efficient than embedded SQL, that may or may not be true
in different real-life situations. Understanding the general five steps of a
SQL statement processing is the key to the appropriate use of embedded/dynamic
SQL in each particular case.Embedded/dynamic SQL is gradually becoming
obsolete in the face of arising new database technologies, but it is far from
being dead because of large amounts of legacy programming code. Embedded SQL
has also found its place inside some modern technologies where it is the only
choice — i.e., embedded databases.
