WebLogic Type 4 JDBC Drivers

SQL Escape Sequences for JDBC

Language features, such as outer joins and scalar function calls, are commonly implemented by database systems. The syntax for these features is often database-specific, even when a standard syntax has been defined. JDBC defines escape sequences that contain standard syntaxes for the following language features:

• Date, time, and timestamp literals
• Scalar functions such as numeric, string, and data type conversion functions
• Outer joins
• Procedure calls

The escape sequence used by JDBC is:

{extension}

The escape sequence is recognized and parsed by the BEA WebLogic Type 4 JDBC drivers, which replace the escape sequences with data store-specific grammar.

 

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Date, Time, and Timestamp Escape Sequences

The escape sequence for date, time, and timestamp literals is:

{literal-type 'value'}

where literal-type is one of the following:

 

Example:

UPDATE Orders SET OpenDate={d '1995-01-15'} 
WHERE OrderID=1023

 

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Scalar Functions

You can use scalar functions in SQL statements with the following syntax:

{fn scalar-function}

where scalar-function is a scalar function supported by the BEA WebLogic Type 4 JDBC drivers, as listed in Table C-2.

Example:

SELECT id, name FROM emp WHERE name LIKE {fn UCASE('Smith')}

Table C-2 Scalar Functions Supported

Data Store	String Functions	Numeric Functions	Timedate Functions	System Functions
DB2	ASCII BLOB CHAR CHR CLOB CONCAT DBCLOB DIFFERENCE GRAPHIC HEX INSERT LCASE or LOWER LCASE (SYSFUN schema) LEFT LENGTH LOCATE LONG_VARCHAR LONG_VARGRAPHIC LTRIM LTRIM (SYSFUN schema) POSSTR REPEAT REPLACE RIGHT RTRIM RTRIM (SYSFUN schema)	ABS or ABSVAL ACOS ASIN ATAN ATANH ATAN2 BIGINT CEILING or CEIL COS COSH COT DECIMAL DEGREES DIGITS DOUBLE EXP FLOAT FLOOR INTEGER LN LOG LOG10 MOD POWER RADIANS RAND REAL	DATE DAY DAYNAME DAYOFWEEK DAYOFYEAR DAYS HOUR JULIAN_DAY MICROSECOND MIDNIGHT_SECONDS MINUTE MONTH MONTHNAME QUARTER SECOND TIME TIMESTAMP TIMESTAMP_ISO TIMESTAMPDIFF WEEK YEAR	COALESCE DEREF DLCOMMENT DLLINKTYPE DLURLCOMPLETE DLURLPATH DLURLPATHONLY DLURLSCHEME DLURLSERVER DLVALUE EVENT_MON_STATE GENERATE_UNIQUE NODENUMBER NULLIF PARTITION RAISE_ERROR TABLE_NAME TABLE_SCHEMA TRANSLATE TYPE_ID TYPE_NAME TYPE_SCHEMA VALUE
DB2 (continued)	SOUNDEX SPACE SUBSTR TRUNCATE or TRUNC UCASE or UPPER VARCHAR VARGRAPHIC	ROUND SIGN SIN SINH SMALLINT SQRT TAN TANH TRUNCATE
Informix	CONCAT LEFT LENGTH LTRIM REPLACE RTRIM SUBSTRING	ABS ACOS ASIN ATAN ATAN2 COS COT EXP FLOOR LOG LOG10 MOD PI POWER ROUND SIN SQRT TAN TRUNCATE	CURDATE CURTIME DAYOFMONTH DAYOFWEEK MONTH NOW TIMESTAMPADD TIMESTAMPDIFF YEAR	DATABASE USER
Oracle	ASCII BIT_LENGTH CHAR CONCAT INSERT LCASE LEFT LENGTH LOCATE LOCATE2 LTRIM OCTET_LENGTH REPEAT REPLACE RIGHT RTRIM SOUNDEX SPACE SUBSTRING UCASE	ABS ACOS ASIN ATAN ATAN2 CEILING COS COT EXP FLOOR LOG LOG10 MOD PI POWER ROUND SIGN SIN SQRT TAN TRUNCATE	CURDATE DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR HOUR MINUTE MONTH MONTHNAME NOW QUARTER SECOND WEEK YEAR	IFNULL USER
SQL Server	ASCII CHAR CONCAT DIFFERENCE INSERT LCASE LEFT LENGTH LOCATE LTRIM REPEAT REPLACE RIGHT RTRIM SOUNDEX SPACE SUBSTRING UCASE	ABS ACOS ASIN ATAN ATAN2 CEILING COS COT DEGREES EXP FLOOR LOG LOG10 MOD PI POWER RADIANS RAND ROUND SIGN SIN SQRT TAN TRUNCATE	DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR EXTRACT HOUR MINUTE MONTH MONTHNAME NOW QUARTER SECOND TIMESTAMPADD TIMESTAMPDIFF WEEK YEAR	DATABASE IFNULL USER
Sybase	ASCII CHAR CONCAT DIFFERENCE INSERT LCASE LEFT LENGTH LOCATE LTRIM REPEAT RIGHT RTRIM SOUNDEX SPACE SUBSTRING UCASE	ABS ACOS ASIN ATAN ATAN2 CEILING COS COT DEGREES EXP FLOOR LOG LOG10 MOD PI POWER RADIANS RAND ROUND SIGN SIN SQRT TAN	DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR HOUR MINUTE MONTH MONTHNAME NOW QUARTER SECOND TIMESTAMPADD TIMESTAMPDIFF WEEK YEAR	DATABASE IFNULL USER

 

 

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Outer Join Escape Sequences

JDBC supports the SQL92 left, right, and full outer join syntax. The escape sequence for outer joins is:

{oj outer-join}

where outer-join is:

table-reference {LEFT | RIGHT | FULL} OUTER JOIN 

{table-reference | outer-join} ON search-condition

where:

table-reference is a database table name.

search-condition is the join condition you want to use for the tables.

Example:

SELECT Customers.CustID, Customers.Name, Orders.OrderID, Orders.Status

  FROM {oj Customers LEFT OUTER JOIN

        Orders ON Customers.CustID=Orders.CustID}

  WHERE Orders.Status='OPEN'

Table C-3 lists the outer join escape sequences supported by BEA WebLogic Type 4 JDBC drivers for each data store.

 

 

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Procedure Call Escape Sequences

A procedure is an executable object stored in the data store. Generally, it is one or more SQL statements that have been precompiled. The escape sequence for calling a procedure is:

{[?=]call procedure-name[([parameter][,parameter]...)]}

where:

procedure-name specifies the name of a stored procedure.

parameter specifies a stored procedure parameter.

Note: For DB2, a schema name cannot be used when calling a stored procedure. Also, for DB2 v8.1 and v8.2 for Linux/UNIX/Windows, literal parameter values are supported for stored procedures. Other supported DB2 versions do not support literal parameter values for stored procedures.

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