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authorJörg Frings-Fürst <debian@jff-webhosting.net>2023-08-14 19:45:36 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2023-08-14 19:45:36 +0200
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-<!DOCTYPE HTML PUBLIC>
-<HTML>
-<TITLE>Xbase DBMS Chapter 3</TITLE>
-<BODY BGCOLOR=#FFFFFF>
-<H1><p align="center">Fields and Strings</p></H1>
-<p align="center">Chapter Updated 11/21/22</p><hr>
-
-<br><br>
-The main objective of this chapter is to provide basic information regarding
-various field types supported by the library.<br><br>
-
-Field names can be up to ten bytes in length and can contain characters, numbers
-or special characters in the name. The field methods are used to manipulate
-the data in a record of a data file. There are several types of fields.<br><br>
-
-
-<TABLE BORDER>
-<CAPTION ALIGN="TOP"><h3>Field Types</H3></CAPTION>
-<TR VALIGN="BASELINE">
-<TR><TH ALIGN="LEFT">Type<TD>Size<TD>Allowable Values<TD>Schema Value
-<TR><TH ALIGN="LEFT">Numeric<TD>0 - 17(include sign and decimal point<TD>+ - . 0 through 9<TD>XB_NUMERIC_FLD
-<TR><TH ALIGN="LEFT">Character<TD>0 - 254<TD>Anything<TD>XB_CHAR_FLD
-<TR><TH ALIGN="LEFT">Date<TD>8<TD>CCYYMMDD<TD>XB_DATE_FLD
-<TR><TH ALIGN="LEFT">Floating Point<TD>0 - 17 (includes sign and decimal point<TD>+ - . 0 through 9<TD>XB_FLOAT_FLD
-<TR><TH ALIGN="LEFT">Logical<TD>1<TD>? Y y N n T t F f (? - uninitialized)<TD>XB_LOGICAL_FLD
-<TR><TH ALIGN="LEFT">Memo<TD>Fixed length portion - 10<br>Variable length 0 - 32760
-<TD>Type III - Text<br>Type IV - Anything<TD>XB_MEMO_FLD
-</TABLE>
-
-<br><br>
-Field names, types and lengths are defined when a data file is created.
-After the file is created, the field characteristics can not be changed. To
-change field characteristics, a new database table must be defined with the new
-field requirements.<br><br>
-
-<h2>Memo Fields</h2>
-
-Memo fields are variable length data fields which are stored in two parts.
-This first part is a ten byte field which is stored
-in the fixed length record of the .DBF file. The variable data is stored in
-a seperate .DBT file in 512 byte blocks. The ten byte field in the fixed
-length portion of the record points to a .DBT block number.<br><br>
-
-There are two versions of memo data files type III and type IV. Type IV
-is more advanced in that released space can be reused and it also
-supports BLOB data. The type III file is older technology, does not
-support dynamic space reclamation and only supports string data.
-See method xbDbf::SetVersion for controlling which version type you are
-using.
-
-<br><br>
-To utilize memo fields, the application program must allocate a buffer
-which is large enough to handle the memo data.<br><br>
-
-<h2>Fields and Field Numbers</h2>
-
-The Xbase routines can access field data via using field names or field
-numbers. Field numbers are numbered 0-n where the first field in a datafile
-is field 0 going through the last field n. Accessing fields by number is
-slightly more efficient than accessing by name.<br><br>
-
-<h2>Strings</h2>
-
-Xbase64 includes support for a string class <em>xbString</em>.
-The xbString class interface was originally derived from the
-<em>Draft Standard C++ Library by P.J. Plauger</em> and modified.
-If you are familiar with other string classes, this one should be similar.
-Strings can be used to manage strings of character data.
-<br><br>
-<hr>
-<p><img src="xbase.jpg"><hr>
-</BODY>
-</HTML>