code 128 crystal reports 8.5 DATA LOADING AND UNLOADING in Objective-C

Encoding Data Matrix in Objective-C DATA LOADING AND UNLOADING

CHAPTER 15 DATA LOADING AND UNLOADING
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SQLLDR Caveats
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In this section, we will discuss some things to have to watch out for when using SQLLDR.
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TRUNCATE Appears to Work Differently
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The TRUNCATE option of SQLLDR might appear to work differently than TRUNCATE does in SQL*Plus, or any other tool. SQLLDR, working on the assumption you will be reloading the table with a similar amount of data, uses the extended form of TRUNCATE. Specifically, it issues the following: truncate table t reuse storage The REUSE STORAGE option does not release allocated extents it just marks them as free space. If this were not the desired outcome, you would truncate the table prior to executing SQLLDR.
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SQLLDR Defaults to CHAR(255)
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This issue comes up so often, I ve decided to talk about it twice in this chapter. The default length of input fields is 255 characters. If your field is longer than this, you will receive an error message: Record N: Rejected - Error on table T, column C. Field in data file exceeds maximum length This does not mean the data will not fit into the database column; rather, it indicates that SQLLDR was expecting 255 bytes or less of input data, and it received somewhat more than that. The solution is to simply use CHAR(N) in the control file, where N is big enough to accommodate the largest field length in the input file. Refer to the very first item in the earlier section Loading Data with SQLLDR FAQs for an example.
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Command Line Overrides Control File
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Many of the SQLLDR options may be either placed in the control file or used on the command line. For example, I can use INFILE FILENAME as well as SQLLDR ... DATA=FILENAME. The command line overrides any options in the control file. You cannot count on the options in a control file actually being used, as the person executing SQLLDR can override them.
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In this section, we explored many areas of loading data. We covered the typical, everyday issues we will encounter: loading delimited files, loading fixed-length files, loading a directory full of image files, using functions on input data to transform the input, and so on. We did not cover massive data loads using the direct path loader in any detail; rather, we touched lightly on that subject. Our goal was to answer the questions that arise frequently with the use of SQLLDR and that affect the broadest audience.
External Tables
External tables were first introduced in Oracle9i Release 1. Put simply, they allow us to treat an operating system file as if it is a read-only database table. They are not intended to be a replacement for a real table, or to be used in place of a real table; rather, they are intended to be used as a tool to ease the loading and, in Oracle 10g and above, unloading of data.
CHAPTER 15 DATA LOADING AND UNLOADING
When the external tables feature was first unveiled, I often referred to it as the replacement for SQLLDR. This idea still holds true most of the time. Having said this, you might wonder why we just spent so much time looking at SQLLDR. The reason is that SQLLDR has been around for a long time, and there are many, many legacy control files lying around. SQLLDR is still a commonly used tool; it is what many people know and have used. We are still in a period of transition from the use of SQLLDR to external tables, thus SQLLDR is still very relevant. What many DBAs don t realize is that their knowledge of SQLLDR control files is readily transferable to the use of external tables. You ll discover, as we work through the examples in this part of the chapter, that external tables incorporate much of the SQLLDR syntax and many of the techniques. SQLLDR should be chosen over external tables in the following situations: You have to load data over a network in other words, when the input file is not on the database server itself. One of the restrictions of external tables is that the input file must be accessible on the database server. Multiple users must concurrently work with the same external table processing different input files.
With those exceptions in mind, in general I strongly recommend using external tables for their extended capabilities. SQLLDR is a fairly simple tool that generates an INSERT statement and loads data. Its ability to use SQL is limited to calling SQL functions on a row-by-row basis. External tables open up the entire SQL set of functionality to data loading. Some of the key functionality features that external tables have over SQLLDR, in my experience, are as follows: The ability to use complex WHERE conditions to selectively load data. SQLLDR has a WHEN clause to select rows to load, but you are limited to using only AND expressions and expressions using equality no ranges (greater than, less than), no OR expressions, no IS NULL, and so on. The ability to MERGE data. You can take an operating system file full of data and update existing database records from it. The ability to perform efficient code lookups. You can join an external table to other database tables as part of your load process. The ability to load data sorted by including an ORDER BY statement in the CREATE TABLE or INSERT statement. Easier multitable inserts using INSERT. Starting in Oracle9i, an INSERT statement can insert into one or more tables using complex WHEN conditions. While SQLLDR can load into multiple tables, it can be quite complex to formulate the syntax. A shallower learning curve for new developers. SQLLDR is yet another tool to learn, in addition to the programming language, the development tools, the SQL language, and so on. As long as a developer knows SQL, he can immediately apply that knowledge to bulk data loading, without having to learn a new tool (SQLLDR).
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