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The procedure in an SQL client module is sometimes referred to as an externally invoked procedure.
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The SQLSTATE status parameter provides a way to report errors back to your host language. Like any other host parameter, values are passed between the SQL database (the DBMS) and the host program. In the case of SQLSTATE, the values are related to the status of SQL statement execution. By including the SQLSTATE parameter in your modules, you re allowing your host program to see the status of your statement execution. As a result, the program can monitor for errors and take appropriate actions if those errors occur. In addition to the SQLSTATE status parameter, you must declare all other host parameters used in the procedure s SQL statement. Parameter names (except SQLSTATE) must be preceded by a colon when being declared and when used in the SQL statement. As you can see in the syntax, parameter declarations must be enclosed by parentheses. In addition, if more than one parameter is declared, those declarations must be separated with commas.
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Now that we ve reviewed the syntax for an SQL client module, let s take a look at an example of how to create one. In the following statement, I create a module that contains one procedure:
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MODULE QUERY_CD_INVENTORY LANGUAGE C SCHEMA INVENTORY AUTHORIZATION Sales PROCEDURE QUERY_1 ( SQLSTATE, :p_CD_ID INT, :p_CD_NAME VARCHAR(60) ) SELECT CD_NAME INTO :p_CD_NAME FROM CD_INVENTORY WHERE CD_ID = :p_CD_ID;
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As you can see in this example, we re creating a module named QUERY_CD_ INVENTORY. The module will be called by a C program (LANGUAGE C). The SQL statement within the module will access a table in the INVENTORY schema and will be executed under the context of the Sales authorization identifier. The MODULE statement includes only one procedure, which is named QUERY_1. If more than one procedure were defined, they would each be terminated by a semicolon. Now let s take a closer look at the QUERY_1 procedure. The first thing you might notice is that three host parameters have been declared. The SQLSTATE parameter provides status information to the host program. The p_CD_ID parameter is an input parameter that will receive a value from the host program. The p_CD_ NAME parameter is an output parameter that will take the value returned by the SELECT statement and pass it to the host program. Notice that both the p_CD_ID and p_CD_NAME parameters are preceded by a colon and declared with a data type. The SQLSTATE parameter does not require a semicolon or data type. Once we declare the parameters, we can define the SELECT statement. As you can see, the input parameter is used in the WHERE clause, and the output parameter is used in the INTO clause. The use of the parameters in this way allows the module to interact with the host program. A value for the input parameter is passed to the module when the module is called within the host language, and the output parameter is returned to the host language to be used by the program as necessary.
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The process of calling a module within a host program and passing a parameter to the module is language-specific. Be sure to check the documentation for the specific programming language and for the applicable SQL implementation.
As you can see, an SQL client module can be a handy tool for developing the SQL component of an application without having to embed the SQL statements within the host language. Unfortunately, SQL client modules are not widely supported in SQL implementations, and if they are supported, they are often not well documented. However, whether or not they re widely implemented is becoming beside the point as the industry moves away from embedded SQL and SQL client modules toward CLI and CLI-like data access, which I cover in the next section.
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