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diff --git a/docs/html/xbc17.html b/docs/html/xbc17.html new file mode 100755 index 0000000..c0b2208 --- /dev/null +++ b/docs/html/xbc17.html @@ -0,0 +1,219 @@ +<!DOCTYPE HTML PUBLIC> +<HTML> +<TITLE>Xbase DBMS Chapter 17</TITLE> +<BODY BGCOLOR=#FFFFFF> +<H2><p align="center">Class xbSsv</p></H2> +<p align="center">Chapter Updated 2/7/23</p><hr> + +<h3>Class xbSsv - Shared System Values.</h3> + +Base class xbSsv is used for maintaining static variables used system +wide by the XBase library routines and is a base class that is used by the xbXBase class. +See the diagram in chapter 15 to gain an understanding of where the xbSsv class sits in relation to the +other classes. Accessing the methods in this class are done via the xbXBase class instance.<br><br> +Additionally, there are a few other misc routines contained in this class that are available to all +subordinate classes/objects. +<br><br><br><br> + + +<center> +<table border=1> +<tr><th width=40%>Method</th><th>Description</th></tr> + +<tr><td>void BitDump( unsigned char c ) const<br>void BitDump( char c ) const</td><td>These routines dump the bits for a specified char field to stdout.</td></tr> +<tr><td>xbBool BitSet( unsigned char c, xbInt16 iBitNo ) const</td><td>This routine will set a specified bit in a char field.</td></tr> +<tr><td>void DisplayError( xbInt16 ErrorCode ) const</td><td>This routine prints a description for a specifed error to stdout.</td></tr> + +<tr><td>xbString& GetDataDirectory() const<br>void SetDataDirectory( const xbString &sDataDirectory )</td> + <td>Get and Set the current directory where the library routines expect to find the .DBF, .DBT, .NDX and .MDX files.</td></tr> + +<tr><td>xbString& GetDefaultDateFormat() const<br>void SetDefaultDateFormat( const xbString &sDefaultDateFormat )</td> + <td>Get and Set the current default date format used by the date formatting routines if no format specifier is provided.</td></tr> + +<tr><td>xbInt16 GetEndianType() const</td><td>Returns the current Endian type of the machine the library is operating on.</td></tr> +<tr><td>const char *GetErrorMessage( xbInt16 ErrorCode ) const</td><td>Returns a pointer to an error message for a given error number.</td></tr> + +<tr><td>xbBool GetDefaultAutoCommit() const<br>void SetDefaultAutoCommit( xbBool bDefaultAutoCommit )</td> + <td>Get and Set the default auto commit status. If auto commit is on, the library will automatically post any updates to the database when navigating away from an updated record.</td></tr> + +<tr><td>xbBool GetHomeDir( xbString &sHomeDirOut )</td><td>Get the home directory for the current user.</td></tr> + +<tr><td>xbString& GetLogDirectory() const<br>void SetLogDirectory( const xbString &sLogDirectory )</td> + <td>Get and set the directory location for any system generated logfiles.</td></tr> +<tr><td>xbString& GetLogFileName() const</td><td>Returns the default log file name.</td></tr> + + +<tr><td>xbBool GetMultiUser() const<br>void SetMultiUser( xbBool bMultiUser )</td> + <td>Get and set multi user status. This turns the auto locking on and off. For better performance in single user applications, turn multuser off.</td></tr> + +<tr><td>xbInt16 GetUniqueKeyOpt() const<br>xbInt16 SetUniqueKeyOpt( xbInt16 iUniqueKeyOpt )</td> + <td>Determines library behavior for unique key processing. The original Dbase (tm) product allowed duplicate recrds in the .DBF file when the unique option was specified for a given index tag. + The Xbase library supports either the original DBase behavior (XB_EMULATE_DBASE), or the prevention of duplicate records for duplicate keys (XB_HALT_ON_DUPKEY).</td></tr> + + +<tr><td>xbInt16 GetDefaultLockRetries() const<br>void SetDefaultLockRetries( xbInt16 iRetryCount )</td> + <td>Get and Set the number of times to attempt a lock</td></tr> + +<tr><td>xbInt32 GetDefaultLockWait() const<br>void SetDefaultLockWait( xbInt32 lRetryWait ) + </td><td>Get and Set the wait time between lock attempts.</td></tr> + +<tr><td>xbInt16 GetDefaultLockFlavor() const<br>void SetDefaultLockFlavor( xbInt16 iLockFlavor ) + </td><td>For future use. With current versions, only DBase (TM) locking offsets are supported.</td></tr> + +<tr><td>xbBool GetDefaultAutoLock() const<br>void SetDefaultAutoLock( xbBool bAutoLock )<br>void EnableDefaultAutoLock()<br>void DisableDefaultAutoLock() + </td><td>Set, Get or update Auto Lock Status</td></tr> + + +<tr><td>xbInt16 GetCreateMdxBlockSize() const<br>xbInt16 SetCreateMdxBlockSize( xbInt16 ulBlockSize ) + </td><td>Set or get MDX Index block size. Must be a multiple of 512.</td></tr> + +<tr><td>xbUInt32 GetDefaultBlockReadSize() const<br>void SetDefaultBlockReadSize( xbUInt32 ulDfltBlockReadSize ) + </td><td>Set or Get the default block size for Block Read functionality. Block reading is used to improve sequentential access performance.</td></tr> +</table> + +<br><br> + +<h3>Example program using xbSsv methods</h3> +</center> +<xmp> +/* xb_ex_ssv.cpp +XBase64 Software Library + +Copyright (c) 1997,2003,2014,2021,2022,2023 Gary A Kunkel + +The xb64 software library is covered under the terms of the GPL Version 3, 2007 license. + +Email Contact: + + XDB-devel@lists.sourceforge.net + XDB-users@lists.sourceforge.net + +This program demonstrates using functionality of the xbSsv class (Shared system values) + +*/ + +#include "xbase.h" + +using namespace xb; + +int main( int ac, char ** av ){ + + xbXBase x; // set up xbase for business + xbString sMsg; // a message string + + sMsg.Sprintf( "Program [%s] initializing...", av[0] ); + std::cout << sMsg.Str() << std::endl; + + // example code to set up log file usage + #ifdef XB_LOGGING_SUPPORT + char cSeperator; // is this a unix (/) or windows (\) file system + xbString sLog; // general string for log file activities + sLog = x.GetLogFqFileName().Str(); // get the system default log file name + std::cout << "System default logfile is [" << sLog.Str() << "]" << std::endl; + + cSeperator = sLog.GetPathSeparator(); // get the seperator from + std::cout << "Path seperator = [" << cSeperator << "]" << std::endl; + + sLog.Sprintf( "..%c", cSeperator ); + x.SetLogDirectory( sLog ); + std::cout << "sLog = [" << sLog.Str() << "]\n"; + + sLog = x.GetLogFqFileName().Str(); // get the system default log file name + std::cout << "New logfile is [" << sLog.Str() << "]" << std::endl; + + // turn on logging after file name set + x.EnableMsgLogging(); + #endif // XB_LOGGING_SUPPORT + + // const char *GetErrorMessage( xbInt16 ErrorCode ) const; + // void DisplayError( xbInt16 ErrorCode ) const; + std::cout << "DisplayError( -100 ) - "; + x.DisplayError( -100 ); + // << "]" << std::endl; + + + // void SetDefaultDateFormat( const xbString &sDefaultDateFormat ); + // xbString& GetDefaultDateFormat() const; + std::cout << "GetDefaultDateFormat() - " << x.GetDefaultDateFormat() << std::endl; + + // void SetDataDirectory ( const xbString &sDataDirectory ); + // xbString& GetDataDirectory() const; + std::cout << "GetDataDirectory() - " << x.GetDataDirectory() << std::endl; + + // xbInt16 GetEndianType() const; + if( x.GetEndianType() == 'L' ) + std::cout << "Little Endian Architecture." << std::endl; + else + std::cout << "Bid Endian Architecture." << std::endl; + + //xbBool GetDefaultAutoCommit() const; + //void SetDefaultAutoCommit( xbBool bDefaultAutoCommit ); + if( x.GetDefaultAutoCommit()) + std::cout << "AutoCommit is on." << std::endl; + else + std::cout << "AutoCommit is off." << std::endl; + + //xbBool GetMultiUser () const; + //void SetMultiUser ( xbBool bMultiUser ); + if( x.GetMultiUser()) + std::cout << "Multi user (locking) is enabled." << std::endl; + else + std::cout << "Multi user (locking) not enabled." << std::endl; + + #if defined (XB_NDX_SUPPORT) || defined (XB_MDX_SUPPORT) + // xbInt16 GetUniqueKeyOpt () const; + // xbInt16 SetUniqueKeyOpt ( xbInt16 iUniqueKeyOpt ); + // XB_HALT_ON_DUPKEY + // XB_EMULATE_DBASE + if( x.GetUniqueKeyOpt() == XB_HALT_ON_DUPKEY ) + std::cout << "UniqueKey option - XB_HALT_ON_DUPKEY" << std::endl; + else if( x.GetUniqueKeyOpt() == XB_EMULATE_DBASE ) + std::cout << "UniqueKey option - XB_EMULATE_DBASE" << std::endl; + #endif // (XB_NDX_SUPPORT) || defined (XB_MDX_SUPPORT) + + #ifdef XB_LOCKING_SUPPORT + //xbInt16 GetDefaultLockRetries () const; + //void SetDefaultLockRetries ( xbInt16 iRetryCount ); + //xbInt32 GetDefaultLockWait () const; + //void SetDefaultLockWait ( xbInt32 lRetryWait ); + //xbInt16 GetDefaultLockFlavor () const; + //void SetDefaultLockFlavor ( xbInt16 iLockFlavor ); + //xbBool GetDefaultAutoLock () const; + //void SetDefaultAutoLock ( xbBool bAutoLock ); + //void EnableDefaultAutoLock (); + //void DisableDefaultAutoLock (); + + std::cout << "GetDefaultLockRetries() - " << x.GetDefaultLockRetries() << std::endl; + std::cout << "GetDefaultLockWait() - " << x.GetDefaultLockWait() << std::endl; + std::cout << "GetDefaultAutoLock() - " << x.GetDefaultAutoLock() << std::endl; + #endif // XB_LOCKING_SUPPORT + + #ifdef XB_MDX_SUPPORT + // xbInt16 GetCreateMdxBlockSize() const; + // xbInt16 SetCreateMdxBlockSize( xbInt16 ulBlockSize ); + std::cout << "GetCreateMdxBlockSize() - " << x.GetCreateMdxBlockSize() << std::endl; + #endif // XB_MDX_SUPPORT + + #ifdef XB_BLOCKREAD_SUPPORT + // xbUInt32 GetDefaultBlockReadSize() const; + // void SetDefaultBlockReadSize( xbUInt32 ulDfltBlockReadSize ); + std::cout << "GetDefaultBlockReadSize() - " << x.GetDefaultBlockReadSize() << std::endl; + #endif // XB_BLOCKREAD_SUPPORT + + //xbBool BitSet ( unsigned char c, xbInt16 iBitNo ) const; + //void BitDump ( unsigned char c ) const; + //void BitDump ( char c ) const; + std::cout << "BitDump( 'A' ) - "; + x.BitDump( 'A' ); + + return 0; +} + + +</xmp> + +<br><br> +<hr> +<p><img src="xbase.jpg"><br><hr> +</BODY> +</HTML> |