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Using Dynamic SQL in Languages Other Than PL/SQL

WHERE deptno = :deptno

RETURNING dname INTO :dname';

Table 6–4 shows sample code that accomplishes this operation using both the DBMS_SQL package and native dynamic SQL.

Table 6–4 DML Returning Operation Using the DBMS_SQL Package and Native Dynamic SQL

DBMS_SQL DML Returning Operation

Native Dynamic SQL DML Returning Operation

 

 

 

DECLARE

DECLARE

 

deptname_array dbms_sql.Varchar2_Table;

deptname_array dbms_sql.Varchar2_Table;

cur_hdl INT;

stmt_str

VARCHAR2(200);

stmt_str VARCHAR2(200);

location

VARCHAR2(20);

location VARCHAR2(20);

deptnumber NUMBER := 10;

deptnumber NUMBER := 10;

deptname

VARCHAR2(20);

rows_processed NUMBER;

BEGIN

 

BEGIN

stmt_str := 'UPDATE dept_new

stmt_str := 'UPDATE dept_new

SET loc = :newloc

SET loc = :newloc

WHERE deptno = :deptno

WHERE deptno = :deptno

RETURNING dname INTO :dname';

RETURNING dname INTO :dname';

EXECUTE IMMEDIATE stmt_str

 

USING location, deptnumber, OUT deptname;

cur_hdl := dbms_sql.open_cursor;

END;

 

dbms_sql.parse

/

 

(cur_hdl, stmt_str, dbms_sql.native);

 

 

-- supply binds

 

 

dbms_sql.bind_variable

 

 

(cur_hdl, ':newloc', location);

 

 

dbms_sql.bind_variable

 

 

(cur_hdl, ':deptno', deptnumber);

 

 

dbms_sql.bind_array

 

 

(cur_hdl, ':dname', deptname_array);

 

 

-- execute cursor

 

 

rows_processed := dbms_sql.execute(cur_hdl);

 

 

-- get RETURNING column into OUT bind array

 

 

dbms_sql.variable_value

 

 

(cur_hdl, ':dname', deptname_array);

 

 

dbms_sql.close_cursor(cur_hdl);

 

 

END;

 

 

/

 

 

 

 

 

Using Dynamic SQL in Languages Other Than PL/SQL

Although this chapter discusses PL/SQL support for dynamic SQL, you can call dynamic SQL from other languages:

6-20 Oracle Database Application Developer's Guide - Fundamentals

Using Dynamic SQL in Languages Other Than PL/SQL

If you use C/C++, you can call dynamic SQL with the Oracle Call Interface (OCI), or you can use the Pro*C/C++ precompiler to add dynamic SQL extensions to your C code.

If you use COBOL, you can use the Pro*COBOL precompiler to add dynamic SQL extensions to your COBOL code.

If you use Java, you can develop applications that use dynamic SQL with JDBC.

If you have an application that uses OCI, Pro*C/C++, or Pro*COBOL to execute dynamic SQL, you should consider switching to native dynamic SQL inside PL/SQL stored procedures and functions. The network round-trips required to perform dynamic SQL operations from client-side applications might hurt performance. Stored procedures can reside on the server, eliminating the network overhead. You can call the PL/SQL stored procedures and stored functions from the OCI, Pro*C/C++, or Pro*COBOL application.

See Also: For information about calling Oracle Database stored procedures and stored functions from various languages:

Oracle Call Interface Programmer's Guide

Pro*C/C++ Programmer's Guide

Pro*COBOL Programmer's Guide

Coding Dynamic SQL Statements 6-21

Using Dynamic SQL in Languages Other Than PL/SQL

6-22 Oracle Database Application Developer's Guide - Fundamentals

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