qr barcode generator vb.net PART V in Software

Generation QR Code ISO/IEC18004 in Software PART V

PART V
Reading QR Code 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Painting Denso QR Bar Code In None
Using Barcode printer for Software Control to generate, create QR-Code image in Software applications.
/* OUT: statement handle */
Scan QR Code In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
QR-Code Generator In C#
Using Barcode encoder for .NET Control to generate, create QR image in Visual Studio .NET applications.
/* Free a connection handle previously allocated */ SQLSMALLINT SQLFreeStmt ( SQLINTEGER SQLINTEGER stmtHdl, option) /* IN: /* IN: statement handle */ cursor and unbind options */
Quick Response Code Creator In .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
QR Code Generation In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
FIGURE 19-18
QR-Code Drawer In Visual Basic .NET
Using Barcode creation for .NET Control to generate, create QR-Code image in VS .NET applications.
Encode GTIN - 13 In None
Using Barcode printer for Software Control to generate, create EAN-13 image in Software applications.
SQL/CLI handle management routines
Creating UPCA In None
Using Barcode creation for Software Control to generate, create UPCA image in Software applications.
Printing GS1 128 In None
Using Barcode encoder for Software Control to generate, create EAN 128 image in Software applications.
Part V:
Create Barcode In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Painting Bar Code In None
Using Barcode creation for Software Control to generate, create barcode image in Software applications.
Programming with SQL
USPS OneCode Solution Barcode Generation In None
Using Barcode creation for Software Control to generate, create Intelligent Mail image in Software applications.
Data Matrix Encoder In None
Using Barcode creation for Microsoft Excel Control to generate, create Data Matrix ECC200 image in Office Excel applications.
SQL-Connections
ECC200 Creation In None
Using Barcode creator for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
GTIN - 13 Generator In Visual Basic .NET
Using Barcode printer for .NET Control to generate, create EAN 13 image in .NET framework applications.
Within a SQL-environment, an application program may establish one or more SQLconnections. A SQL-connection is a linkage between the program and a specific SQL server (database server) over which SQL statements are processed. In practice, a SQL-connection often is actually a virtual network connection to a database server located on another computer system. However, a SQL-connection may also be a logical connection between a program and a DBMS located on the same computer system. Figure 19-19 shows the CLI routines that are used to manage SQL-connections. To establish a connection, an application program first allocates a connection handle by calling SQLAllocHandle() with the appropriate handle type. It then attempts to connect to the target SQL server with a SQLConnect() call. SQL statements can subsequently be processed over the connection. The connection handle is passed as a parameter to all of the statement-processing calls to indicate which connection is being used. When the connection is no longer needed, a call to SQLDisconnect() terminates it, and a call to SQLFreeHandle() releases the associated connection handle in the CLI.
ANSI/AIM Code 39 Generator In None
Using Barcode drawer for Font Control to generate, create Code39 image in Font applications.
Encoding Linear In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create Linear Barcode image in ASP.NET applications.
/* Initiate a connection to a SQL-server */ SQLSMALLINT SQLConnect( SQLINTEGER SQLCHAR SQLSMALLINT SQLINTEGER SQLSMALLINT SQLINTEGER SQLSMALLINT connHdl, svrnamlen, *userName, usrnamlen, *passwd, pswlen) /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: /* IN: connection handle */ name of target SQL-server */ length of SQL-server name */ user name for connection */ length of user name */ connection password */ password length */ *svrName,
Barcode Drawer In Objective-C
Using Barcode generator for iPhone Control to generate, create bar code image in iPhone applications.
Decoding UCC - 12 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
/* Disconnect from a SQL-server */ SQLSMALLINT SQLDisconnect( SQLINTEGER connHdl) /* IN: connection handle */
/* Get the name(s) of accessible SQL-servers for connection */ SQLSMALLINT SQLDataSources ( SQLINTEGER SQLSMALLINT SQLINTEGER SQLSMALLINT SQLINTEGER SQLSMALLINT envHdl, direction, *svrname, buflen, *descrip, buf2len, /* IN: /* IN: /* IN: environment handle */ indicates first/next request */ length of server name buffer */
/* OUT: buffer for server name */ /* OUT: actual length of server name */ /* OUT: buffer for description */ /* IN: length of description buffer */ /* OUT: actual length of description */
SQLSMALLINT *namlen,
SQLSMALLINT *dsclen)
FIGURE 19-19
SQL/CLI connection management routines
19:
SQL APIs
Normally, an application program knows the name of the specific database server (in terms of the standard, the SQL server ) that it needs to access. In certain applications (such as general-purpose query or data entry tools), it may be desirable to let the user choose which database server is to be used. The CLI SQLDataSources() call returns the names of the SQL servers that are known to the CLI that is, the data sources that can be legally specified as server names in SQLConnect() calls. To obtain the list of server names, the application repeatedly calls SQLDataSources(). Each call returns a single server description, until the call returns an error indicating no more data. A parameter to the call can be optionally used to alter this sequential retrieval of server names.
CLI Statement Processing
The CLI processes SQL statements using a technique very similar to that described for dynamic embedded SQL in 18. The SQL statement is passed to the CLI in text form, as a character string. It can be executed in a one- or two-step process. Figure 19-20 shows the basic SQL statement-processing calls. The application program must first call SQLAllocHandle()to obtain a statement handle, which identifies the statement to the program and the CLI. All subsequent SQLExecDirect(), SQLPrepare(), and SQLExecute() calls reference this statement handle. When the handle is no longer needed, it is freed with a SQLFreeHandle() call. For one-step execution, the application program calls SQL SQLExecDirect(), passing the SQL statement text as one of the parameters to the call. The DBMS processes the statement as a result of the call and returns the completion status of the statement. This one-step process was used in the simple example program in Figure 19-17. It corresponds to the one-step EXECUTE IMMEDIATE statement in embedded dynamic SQL, described in 18. For two-step execution, the application program calls SQLPrepare(), passing the SQL statement text as one of the parameters to the call. The DBMS analyzes the statement, determines how to carry it out, and retains this information. It does not immediately carry out the statement. Instead, subsequent calls to the SQLExecute() routine actually cause the statement to be executed. This two-step process corresponds exactly to the PREPARE and EXECUTE embedded dynamic SQL statements described in 18. You should always use it for any SQL operations that will be carried out repeatedly, because it causes the DBMS to go through the overhead of statement analysis and optimization only once, in response to the SQLPrepare() call. Parameters can be passed through the CLI to tailor the operation of the multiple SQLExecute() calls that follow.
Copyright © OnBarcode.com . All rights reserved.