| Oracle® Database Gateway for Adabas User's Guide 11g Release 1 (11.1) Part Number B31055-01 |
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View PDF |
| Oracle® Database Gateway for Adabas User's Guide 11g Release 1 (11.1) Part Number B31055-01 |
|
|
View PDF |
This appendix contains the following sections:
See Also:
Oracle Database SQL Reference for detailed descriptions of keywords, parameters, and options and the Adabas documentation for details of executing SQL statements in a transaction.With a few exceptions, the gateway provides full support for Oracle DELETE, INSERT, SELECT, and UPDATE statements.
The gateway does not support Oracle data definition language (DDL) statements. No form of the Oracle ALTER, CREATE, DROP, GRANT, or TRUNCATE statements can be used. Instead, for ALTER, CREATE, DROP, and GRANT statements, use the pass-through feature of the gateway if you need to use DDL statements against the Adabas database.
Note:
TRUNCATE cannot be used in a pass-through statement.The DELETE statement is fully supported. However, only Oracle functions supported by Adabas can be used.
See Also:
Functions Supported by Adabas for a list of supported functions.The INSERT statement is fully supported. However, only Oracle functions supported by Adabas can be used.
See Also:
Functions Supported by Adabas for a list of supported functions.The SELECT statement is fully supported, with these exceptions:
CONNECT BY condition
NOWAIT
START WITH condition
WHERE CURRENT OF
The UPDATE statement is fully supported. However, only Oracle functions supported by Adabas can be used. Also, you cannot have SQL statements in the subquery that refer to the same table name in the outer query. Subqueries are not supported in the SET clause.
See Also:
Functions Supported by Adabas for a list of supported functions.All functions are evaluated by the Adabas database after the gateway has converted them to Adabas SQL.
Oracle SQL functions with no equivalent function in Adabas are not supported in DELETE, INSERT, or UPDATE statements, but are evaluated by the Oracle Database if the statement is a SELECT statement. That is, the Oracle Database performs post-processing of SELECT statements sent to the gateway.
If an unsupported function is used in a DELETE, INSERT, or UPDATE, statement, the following Oracle error occurs:
ORA-02070: database db_link_name does not support function in this context
The gateway translates the following Oracle Database functions in SQL statements to their equivalent Adabas functions:
The following table specifies the arithmetic operators.
| Oracle | Adabas |
|---|---|
| + |
+ |
| - | - |
| * |
* |
| / |
/ |
The following table specifies the comparison operators.
| Oracle | Adabas |
|---|---|
| = |
= |
| > | > |
| < |
< |
| >= | >= |
| <= |
<= |
| <>, !=, ^= | <>, != |
| IS NOT NULL | IS NOT NULL |
| IS NULL | IS NULL |
The following table specifies the group functions.
| Oracle | Adabas |
|---|---|
| AVG | AVG |
| COUNT | COUNT |
| MAX | MAX |
| MIN | MIN |
| SUM | SUM |
The following table specifies the string functions.
| Oracle | Adabas |
|---|---|
| || |
+ (expression1 + expression2) |
| ASCII | ASCII |
| CHR | CHAR |
| INSTR | CHARINDEX |
| LENGTH | CHAR_LENGTH |
| LOWER | LOWER |
| SUBSTR (second argument cannot be a negative number) | SUBSTRING |
| UPPER | UPPER |
The following table specifies other functions.
| Oracle | Adabas |
|---|---|
| ABS | ABS |
| CEIL | CEILING |
| COS | COS |
| EXP | EXP |
| FLOOR | FLOOR |
| LN | LOG |
| LOG | LOG10 |
| MOD | % |
| NVL | IS NULL |
| POWER | POWER |
| ROUND | ROUND |
| SIN | SIN |
| SQRT | SQRT |
| TAN | TAN |
