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ABENADBC_DDL_DML - ADBC DDL DML

ABENADBC_DDL_DML - ADBC DDL DML

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- DDL and DML Statements

The CL_SQL_STATEMENT class provides the following instance methods for executing DDL and DML statements

  • EXECUTE_DDL
  • EXECUTE_UPDATE

The first method is for DDL statements such as CREATE, DROP, or ALTER, whereas the second method is intended for the DML statements INSERT, UPDATE, and DELETE.

Both methods have a mandatory input parameter STATEMENT of type string, to which a syntactically correct SQL statement must be passed. The method EXECUTE_UPDATE also has a return value ROWS_PROCESSED, which returns the number of table rows processed.

In DML statements values that are passed to the database system can be parameterized using the placeholder ?. When the statement is executed, compatible ABAP Objects must be bound to these parameters. This binding is made using the following methods of the class CL_SQL_STATEMENT, which expect a reference to an elementary, structured, or table-like data object and can be used as an alternative:

  • SET_PARAM
Before the SQL statement is executed, this method must be called exactly once for each placeholder ?. The order of the calls determines the assignment of the elementary data objects to the placeholders from left to right.
  • SET_PARAM_STRUCT
Before the SQL statement is executed, this method must be called exactly once. The components of the structure are bound to the placeholders from left to right. The structure must contain appropriate components for the number and type of the placeholders.
  • SET_PARAM_TABLE
This method is appropriate only for the modifying SQL statements INSERT, UPDATE, and DELETE. It must be called exactly once before the SQL statement is executed. As with a structure, the components of the internal table are bound to the placeholders from left to right. The Native SQL interface converts the content of the table rows to appropriate bulk accesses, such as bulk insertions or bulk deletions.

After each SQL statement is executed, the binding is removed.

Notes

  • The two methods EXECUTE_DDL and EXECUTE_UPDATE are technically different only in that EXECUTE_UPDATE returns the number of rows processed. However, for reasons of readability of the program it is advisable to only use the methods as intended.
  • A data reference to an indicator variable of the built-in type INT2 in the ABAP Dictionary can be passed to the optional input parameter IND_REF of the method SET_PARAM. If the value of this indicator variable is -1, the value 0 of a parameter on the database is converted to a null value.
  • For security reasons, it is better parameterize a DML statement using the placeholder ? rather than concatenating dynamic content. This is also a way of preventing SQL injections. If the statement only contains static content from the program and dynamic content from outside the program is possible only in operand positions using placeholders and the statement cannot be modified from outside.
  • In assignments between ABAP data objects and fields in database tables, a mapping takes place between the ABAP types and the database types. The ABAP types should match the database types. If they do not match, conversions must be made in the Native SQL interface that are platform-dependent and can raise exceptions.

Example

Insertion of a row in a database table with ADBC. The table is first emptied using and then read using . The values of the columns are determined by binding the components of a temporary structure created using instance operator NEW to ? placeholders.






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