| Oracle Procedural Gateway® for WebSphere MQ Installation and User's Guide 10g Release 2 (10.2) for UNIX Part Number B16215-01 |
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| Oracle Procedural Gateway® for WebSphere MQ Installation and User's Guide 10g Release 2 (10.2) for UNIX Part Number B16215-01 |
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View PDF |
Use the Oracle Visual Workbench for developing applications that access WebSphere MQ through the gateway. The Oracle Visual Workbench defines an interface for accessing WebSphere MQ and automatically generates the PL/SQL code (the MIP) for Oracle applications to interface with the gateway. Refer to the Oracle Visual Workbench for Oracle Procedural Gateways for IBM MQSeries Installation and User's Guide for more information about Oracle Visual Workbench. This appendix includes the following sections:
Messages sent to a WebSphere MQ queue or retrieved from a WebSphere MQ queue are transferred as untyped data by the MIP procedures. When data profiles are defined in the MIP, the MIP converts message data from Oracle data types to target data types that the receiving application understands. The message data is packed into a buffer of the RAW data type before being sent to the WebSphere MQ queue. The same conversion process applies when receiving a message. The MIP unpacks the message from the buffer and converts it to specified Oracle data types.
The MIP uses the functions of the UTL_RAW package to perform the message data conversions. The UTL_RAW package is a PL/SQL package that contains procedures for converting and packing message data which is sent back and forth through the WebSphere MQ queues using the RAW data type and PL/SQL data types.
When necessary, you can enhance the message data conversions in the generated MIP with the UTL_RAW functions. When no data profiles are defined in the MIP, you can create your own data conversion procedures with UTL_RAW functions, calling these functions before sending a message and immediately after receiving a message.
The UTL_RAW package is not included with the gateway. It is shipped with each Oracle server. Refer to your Oracle DBA for information about installing the UTL_RAW package.
The UTL_RAW functions are called with the following syntax:
UTL_RAW.function(arg1, arg2, ...)
The function name, arguments, their Oracle data types, and the return value data type are provided with each function description in this appendix. For ease of description, the functions are described with PL/SQL syntax that shows the resulting function value placed in a variable as follows:
result := UTL_RAW.function(arg1, arg2, ...);
However, the function can also be used as a component in a PL/SQL expressio. For example, the function takes two characters strings, Hello and world!, converts them to raw message data with UTL_RAW.CAST_TO_RAW, concatenates them with UTL_RAW.CONCAT, and uses the gateway to send them to a WebSphere MQ queue. The same message is retrieved from the queue, converted to a character data type with UTL_RAW.CAST_TO_VARCHAR2, and then printed.
PGM_UTL.TO_RAW converts values of the PGM.MQOD, PGM.MQMD, PGM.MQPMO and PGM.MQGMO object to into raw values.
Syntax
result := PGM_UTL.TO_RAW(input);
where:
result is a variable that holds theoutput value of the function. It is of the RAW data type.
input is the input value of the PGM.MQOD, PGM.MQMD, PGM.MQPMO or PGM.MQGMO data type objects that is converted to raw data.
UTL_RAW.BIT_AND performs a bitwise logical AND operation on two raw values. If the values have different lengths, then the AND operation is terminated after the last byte of the shorter of the two values. The unprocessed portion of the longer value is appended to the partial result to produce the final result. The length of the resulting value equals the longer of the two input values.
Syntax
result := UTL_RAW.BIT_AND(input1, input2);
where:
result is the variable that holds the output value of the function. It is data type RAW. The value is null if input1 or input2 is null.
input1 is an input value of data type RAW to BIT_AND with input2.
input2 is an input value of data type RAW to BIT_AND with input1.
UTL_RAW.BIT_COMPLEMENT performs a bitwise logical COMPLEMENT operation of a raw value. The length of the resulting value equals the length of the input value.
Syntax
result := UTL_RAW.BIT_COMPLEMENT(input);
where:
result is the variable that holds the output value of the function. It is of RAW data type. The value is null if input is null.
input is an input value of the RAW data type on which to perform the COMPLEMENT operation.
UTL_RAW.BIT_OR performs a bitwise logical OR operation of two raw values. If the values have different lengths, then the OR operation is terminated after the last byte of the shorter of the two values. The unprocessed portion of the longer value is appended to the partial result to produce the final result. The length of the resulting value equals the length of the longer of the two input values.
Syntax
result := UTL_RAW.BIT_OR(input1, input2);
where:
result is the variable that holds the output value of the function. It is of the data type RAW. The value is null if input1 or input2 is null.
input1 is an input value of the RAW data type to BIT_OR with input2.
input2 is an input value of the RAW data type to BIT_OR with input1.
UTL_RAW.BIT_XOR performs a bitwise logical EXCLUSIVE OR operation of two raw values. If the values have different lengths, then the EXCLUSIVE OR operation is terminated after the last byte of the shorter of the two values. The unprocessed portion of the longer value is appended to the partial result to produce the final result. The length of the resulting value equals the longer of the two input values.
Syntax
result := UTL_RAW.BIT_XOR(input1, input2);
where:
result is the variable that holds the output value of the function. It is data type RAW. The value is null if input1 or input2 is null.
input1 is an input value of the RAW data type to EXCLUSIVE OR with input2.
input2 is an input value of the RAW data type to EXCLUSIVE OR with input1.
UTL_RAW.CAST_TO_RAW converts a value of data type VARCHAR2 into a raw value with the same number of bytes. The input value is treated as if it were composed of single 8-bit bytes, not characters. Multibyte character boundaries are ignored. The data is not modified in any way, it is only changed to data type RAW.
Syntax
result := UTL_RAW.CAST_TO_RAW(input);
where:
result is the variable that holds the output value of the function. It is data type RAW. The value is null if input is null.
input is the input value of the VARCHAR2 data type to convert to raw data.
UTL_RAW.CAST_TO_VARCHAR2 converts a raw value into a value of data type VARCHAR2 with the same number of data bytes. The result is treated as if it were composed of single 8-bit bytes, not characters. Multibyte character boundaries are ignored. The data is not modified in any way, it is only changed to data type VARCHAR2.
Syntax
result := UTL_RAW.CAST_TO_VARCHAR2(input);
where:
result is the variable that holds the output value of the function. It is data type VARCHAR2. The value is null if input is null.
input is the input value of the RAW data type to convert to data type VARCHAR2.
UTL_RAW.COMPARE compares one raw value to another raw value. If they are identical, then UTL_RAW.COMPARE returns 0. If they are not identical, then COMPARE returns the position of the first byte that does not match. If the input values have different lengths, then the shorter input value is padded on the right by a value that you specify.
Syntax
result := UTL_RAW.COMPARE(input1, input2[, pad]);
where:
result is the variable that holds the output value of the function. It is of data type NUMBER. A value of 0 is returned if the values of input1 and input2 are null or identical or the position, numbered from 1, of the first mismatched byte.
input1 is the first input value of the RAW data type to compare.
input2 is the second input value of the RAW data type to compare.
padis a single byte value used to pad the shorter input value. The default is X'00'.
UTL_RAW.CONCAT concatenates a set of up to 12 raw values into a single raw value. The values are appended together, left to right, in the order that they appear in the parameter list. Null input values are skipped, and the concatenation continues with the next non-null value.
If the sum of the lengths of the input values exceeds 32 767 bytes, then a VALUE_ERROR exception is raised.
Syntax
result := UTL_RAW.CONCAT(input1, ... input12);
where:
result is the variable that holds the output value of the function. It is data type RAW.
input1 ... input12 are the input values of RAW data type to concatenate.
UTL_RAW.CONVERT converts a raw value to a different character set A VALUE_ERROR exception is raised for any of the following conditions:
The input value is null or 0 in length
One or both of the specified character sets is missing, null, or 0 in length
The character set names are invalid or unsupported by the Oracle server
Syntax
result := UTL_RAW.CONVERT(input, new_charset, old_charset);
where:
result is the variable that holds the output value of the function. It is of the RAW data type.
input is the input value of the RAW data type to convert.
new_charset is the national language support (NLS) character set to convert input to.
old_charset is the NLS character set that input is currently using.
UTL_RAW.COPIES returns one or more copies of a value. The values are concatenated together. A VALUE_ERROR exception is raised for any of the following conditions:
The input value is null or has a length of 0
A negative number of copies is specified
The length of the result exceeds 32 767 bytes
Syntax
result := UTL_RAW.COPIES(input, number);
where:
result is the variable that holds the output value of the function. It is of the RAW data type.
input is a value of the RAW data type to copy.
number is the number of times to copy input. It must be a positive value.
UTL_RAW.LENGTH returns the length, in bytes, of a raw value.
Syntax
result := UTL_RAW.LENGTH(input);
where:
result is the output value of the function. It is of the NUMBER data type.
input is the input value of the RAW data type to evaluate.
UTL_RAW.OVERLAY replaces a portion of a raw value with a new string of raw data. If the new data is shorter than the length of the overlay area, then the new data is padded to make it long enough. If the new data is longer than the overlay area, then the extra bytes are ignored. If you specify an overlay area that exceeds the length of the input value, then the input value is extended according to the length specified. If you specify a starting position for the overlay area that exceeds the length of the input value, then the input value is padded to the position specified, and then the input value is further extended with the new data.
A VALUE_ERROR exception is raised for any of the following conditions:
The new data used to overlay the input value is null or has a length of 0
The portion of the input value to overlay is not defined
The length of the portion to overlay exceeds 32 767 bytes
The number of bytes to overlay is defined as less than 0
The position within the input value to begin the overlay operation is defined as less than 1
Syntax
result := UTL_RAW.OVERLAY(new_bytes, input, position, length, pad);
where:
result is the variable that holds the output value of the function. It is of the RAW data type.
new_bytes is the new value, a byte string of the RAW data type, to overlay input with. Bytes are selected from new_bytes beginning with the leftmost byte.
input is the input value of data type RAW to overlay.
position is the position within input, numbered from 1, at which to begin overlaying. This value must be greater than 0. The default is 1.
length is the number of bytes to overlay. This must be greater than, or equal to, 0. The default is the length of new_bytes.
pad is a single byte value used to pad when length exceeds the overlay length or when position exceeds the length of input. The default is X'00'.
UTL_RAW.REVERSE reverses the byte sequence of a raw value from end-to-end. For example, this function reverses X'0102F3' to X'F30201' or xyz to zyx. The length of the resulting value is the same length as the input value. A VALUE_ERROR exception is raised if the input value is null or has a length of 0.
Syntax
result := UTL_RAW.REVERSE(input);
where:
result is the output value of the function. It is of the RAW data type.
input is the input value of the RAW data type to be reversed.
UTL_RAW.SUBSTR removes bytes from a raw value. If you specify a positive number as the starting point for the bytes to remove, then SUBSTR counts from the beginning of the input value to find the first byte. If you specify a negative number, then UTL_RAW.SUBSTR counts backwards from the end of the input value to find the first byte.
A VALUE_ERROR exception is raised for any of the following conditions:
The position to begin the removal is specified as 0
The number of bytes to remove is specified as less than 0
Syntax
result := UTL_RAW.SUBSTR(input, position[,length]);
where:
result is the variable that holds the output value of the function. It is of the RAW data type. The value is the specified byte or bytes from input, or the value is a null value if input is null.
input is the input value of the RAW data type from which to extract a portion of its bytes.
position is the byte position from which to start extraction. This value cannot be 0. If the value of position is negative, then SUBSTR counts backwards from the end of input.
length is the number of bytes to extract from input after position. This value must be greater than 0. When not specified, all bytes to the end of input are returned.
UTL_RAW.TRANSLATE changes the value of some of the bytes in a raw value according to a scheme that you specify. Bytes in the input value are compared to a matching string, and when found to match, the byte at the same position in the replacement string is copied to the result. It is omitted from the result if the offset exceeds the length of the replacement string. Bytes in the input value that do not appear in the matching string are copied to the resulting value. Only the leftmost occurrence of a byte in the matching string is used, and subsequent duplicate occurrences are ignored.
If the matching string contains more bytes than the replacement string, then the extra bytes at the end of the matching string have no corresponding bytes in the replacement string. Any bytes in the input value that match such bytes are omitted from the resulting value.
A VALUE_ERROR exception is raised for any of the following conditions:
The input value is null or has a length of 0
The matching string is null or has a length of 0
The replacement string is null or has a length of 0
Syntax
result := UTL_RAW.TRANSLATE(input, match, replace_bytes);
where:
result is the variable that holds the output value of the function. It is of data type RAW.
input is the input value of data type RAW to change.
match specifies the byte 0codes to search for in input and to change to replace_bytes. It is of data type RAW.
replace_bytes specifies the byte codes that replace the codes specified by match. It is of data type RAW.
UTL_RAW.TRANSLITERATE replaces all occurrences of any bytes in a matching string with the corresponding bytes of a replacement string. Bytes in the input value are compared to the matching string, and if they are not found, then they are copied unaltered to the resulting value. If they are found, then they are replaced in the resulting value by the byte at the same offset in the replacement string, or with the pad byte that you specify when the offset exceeds the length of the replacement string. Only the leftmost occurrence of a byte in the matching string is used. Subsequent duplicate occurrences are ignored. The result value of UTL_RAW.TRANSLITERATE is always the same length as the input value.
If the replacement string is shorter than the matching string, then the pad byte is placed in the resulting value when a selected matching string byte has no corresponding byte in the replacement string. A VALUE_ERROR exception is raised when the input value is null or has a length of 0.
UTL_RAW.TRANSLITERATE differs from UTL_RAW.TRANSLATE in the following ways:
Bytes in the input value that are undefined in the replacement string are padded with a value that you specify
The resulting value is always the same length as the input value
Syntax
result := UTL_RAW.TRANSLITERATE (input, replace_bytes, match, pad);
where:
Result is the output value of the function. It is data type RAW.
Input is the input value of data type RAW to change.
Replace_bytes specifies the byte codes to which corresponding bytes of match are changed. This value can be any length that is valid for the RAW data type. The default is a null value and effectively extends with pad to the length of match as necessary.
Match specifies the byte codes to match in input. The value can be any length that is valid for the RAW data type. The default is X'00' through X'FF'.
Pad is a singe byte value that is used to extend the length of replace_bytes when replace_bytes is shorter than match. The default is X'00'.
UTL_RAW.TRANSLATE differs from the UTL_RAW.TRANSLITERATE function in the following ways:
The raw values used for the matching and replacement strings have no default values
Bytes in the input value that are undefined in the replacement string are omitted in the resulting value
The resulting value can be shorter than the input value
UTL_RAW.XRANGE returns a raw value containing all valid one-byte codes within a range that you specify. If the starting byte value is greater than the ending byte value, then the succession of resulting bytes begin with the starting byte, wrapping from X'FF' to X'00', and end at the ending byte.
When specified, the values for the starting and ending bytes must be single-byte raw values.
Syntax
result := UTL_RAW.XRANGE(start, end);
where:
result is the output value of the function. It is of data type RAW.
start is a single byte code to start with. The default is X'00'.
end is a single byte code to end with. The default is X'FF'.
