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Figure 19-12.
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API and are still supported in current ODBC implementations for backward compatibility. However, Microsoft has indicated that the general handle-management routines are now the preferred ODBC functions, and the specific routines may be dropped in future ODBC releases. For maximum cross-platform portability, it s best to use the general-purpose routines.
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The SQL-environment is the highest-level context used by an application program in its calls to the CLI. In a single-threaded application, there will typically be one SQL-environment for the entire program. In a multithreaded application, there may be one SQL-environment per thread or one overall SQL-environment, depending on the architecture of the program. The CLI conceptually permits multiple connections, possibly to several different database servers, from within one SQL-environment. A specific CLI implementation for a specific DBMS may or may not actually support multiple connections.
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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 19-13 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. Normally, an application program knows the name of the specific database server (in terms of the standard, the SQL server ) that it wants 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.
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/* Initiate a connection to a SQL-server */ short SQLConnect( long connHdl, /* IN: connection handle */ char *svrName, /* IN: name of target SQL-server */ short svrnamlen, /* IN: length of SQL-server name */ char *userName, /* IN: user name for connection */ short usrnamlen, /* IN: length of user name */ char *passwd, /* IN: connection password */ short pswlen) /* IN: password length */ /* Disconnect from a SQL-server */ short SQLDisconnect( long connHdl) /* IN: /* Get the name(s) of accessible short SQLDataSources ( long envHdl, /* short direction, /* char *svrname, /* short buflen, /* short *namlen, /* char *descrip, /* short buf2len, /* short *dsclen) /*
connection handle */
SQL-servers for connection */ IN: IN: OUT: IN: OUT: OUT: IN: OUT: environment handle */ indicates first/next request buffer for server name */ length of server name buffer actual length of server name buffer for description */ length of description buffer actual length of description
*/ */ */ */ */
Figure 19-13.
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