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Showing entries 1 to 10 of 13 3 Older Entries

Displaying posts with tag: PL/SQL (reset)

Oracle 12c VARCHAR2?
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The Oracle Database 12c documentation says you can set the maximum size of a VARCHAR2 to 32,767 bytes. That’s true except when you’re trying to map a large Java string to a VARCHAR2. It fails when the physical size of the Java string is greater than 4,000 bytes with an ORA-01002 or fetch out of sequence error.

SELECT read_text_file('C:\Data\loader\Hobbit1.txt')
*
ERROR at line 1:
ORA-24345: A Truncation or null fetch error occurred
 
ERROR:
ORA-01002: fetch out of sequence

You need to grant privileges before you can test this code. You can …

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A T-SQL Table Function
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I had an interesting conversation about table functions in Oracle’s PL/SQL; and the fact that they’re not available in MySQL. When I explained they’re available in Microsoft T-SQL User-Defined Functions (UDFs), my students wanted a small example. One of them said they’d tried to do it but couldn’t get it to work because they found the Microsoft web pages difficult to read and use. Specifically, they didn’t like the sparseness of this one on how to create a function.

Here’s a quick definition of a UDF table function that runs in the …

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Why Stored Programs?
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Why should you use stored programs? Great question, here’s my little insight into a situation that I heard about in a large organization.

A very large organization is having a technology argument. In someway, like politics, half-truth drives this type of discussion. This company has hundreds of databases and they’re about half SQL Server and Oracle. The argument (half-truth) states that using T-SQL or PL/SQL yields “spaghetti” code!

It seems like an old argument from my perspective. After all, I’ve been working with T-SQL and PL/SQL for a long time. Spaghetti code exists in every language when unskilled programmers solve problems but …

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Result Cache Functions
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I finally got around to cleaning up old contact me messages. One of the messages raises a question about RESULT_CACHE functions. The writer wanted an example implementing both a standalone schema and package RESULT_CACHE function.

The question references a note from the Oracle Database 11g PL/SQL Programming book (on page 322). More or less, that note points out that at the time of writing a RESULT_CACHE function worked as a standalone function but failed …

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Oracle CSV Imports
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The first step in creating an effective import plan for comma-separated value (CSV) files is recognizing your options in a database. There are several options in an Oracle database. You can read the file with Java, C/C++, C#, PL/SQL (through the UTL_FILE package), PHP, Perl, or any other C-callable programming language; or you can use SQL*Loader as a standalone utility or through externally managed tables (known as external tables). The most convenient and non-programming solution is using external tables.

Adopting external tables as your import solution should drive you to consider how to manage the security surrounding this type of methodology. Host …

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How to use object types?
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A tale of Oracle SQL object types, their constructors, and how you use them. This demonstrates what you can and can’t do and gives brief explanations about why.

The following creates a base SAMPLE_OBJECT data type and a sample_table
collection of the base SAMPLE_OBJECT data type.

CREATE OR REPLACE TYPE sample_object IS OBJECT
(id       NUMBER
,name     VARCHAR2(30));
/
 
CREATE OR REPLACE TYPE sample_table IS TABLE OF sample_object;
/

If the base SAMPLE_OBJECT data type were a Java object, the default constructor of an empty call parameter list would allow you to construct …


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Function or Procedure?
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Somebody asked for a simple comparison between a PL/SQL pass-by-value function and pass-by-reference procedure, where the procedure uses only an OUT mode parameter to return the result. This provides examples of both, but please note that a pass-by-value function can be used in SQL or PL/SQL context while a pass-by-reference procedure can only be used in another anonymous of named block PL/SQL program.

The function and procedure let you calculate the value of a number raised to a power of an exponent. The third parameter lets you convert the exponent value to an inverse value, like 2 to 1/2.

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MySQL: Copy tables (Only structure and NO DATA) using stored procedure
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Last week some one asked how to Copy the tables (Only structure and NO DATA..also no other DB objects) from one schema to another on EE. This can be easily done from command line but user wanted to do this thru stored procedure.
http://www.experts-exchange.com/Database/MySQL/Q_25024073.html
So I came with a very small MySQL procedure which was doing as needed by the user. I'm not sure whether this is the best way to do this but "There is always room for improvement."
 




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The Humble PL/SQL Dot
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Like many other languages, PL/SQL has its own "dot notation". If we assume that most people can intuit or easily look up things like the syntax for '''IF/THEN/ELSIF''', that means that first-timer users might quickly run into dots and want to understand their significance.The authoritative docs on the dots is in the Oracle Database 11g PL/SQL Language Reference, in particular Appendix B, How PL/

You've Got to Fight for Your Invoker's Rights
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This post is about a PL/SQL feature that doesn't get enough respect, "invoker's rights".First off, what's its real name? Depending on the source, you'll see the feature name spelled "invoker's rights", "invokers' rights", or "invoker rights". That makes a difference -- you'll get different results in Google depending on what combination of singular, plural, and possessive you use. And to be

Showing entries 1 to 10 of 13 3 Older Entries

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