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Meaning Statement completed successfully Successful completion with warning No data found (when retrieving query results) Data needed (required dynamic parameter missing) Error during SQL statement execution Error invalid handle supplied in call
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The CLI uses a technique commonly used by modern operating systems and library packages to manage these conceptual entities. A symbolic pointer called a handle is associated with the overall SQL environment, with a SQL connection to a specific database server, and with the execution of a SQL statement. The handle identifies an area of memory managed by the CLI itself. Some type of handle is passed as one of the parameters in every CLI call. The CLI routines that manage handles are shown in Figure 19-18. A handle is created (allocated) using the CLI SQLAllocHandle() routine. One of the parameters of the routine tells the CLI which type of handle is to be allocated. Another parameter returns the handle value to the application program. Once allocated, a handle is passed to subsequent CLI routines to maintain a context for the CLI calls. In this way, different threads of execution within a program or different concurrently running programs (processes) can each establish their own connection to the CLI and can maintain their own contexts, independent of one another. Handles also allow a single program to have multiple CLI connections to different database servers, and to process more than one SQL statement in parallel. When a handle is no longer needed, the application calls SQLFreeHandle() to tell the CLI to release the resources it is using. In addition to the general-purpose handle management routines, SQLAllocHandle() and SQLFreeHandle(), the CLI specification includes separate routines to create and free an environment, connection, or statement handle. These routines (SQLAllocEnv(), SQLAllocStmt(), and so on) were a part of the original ODBC 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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SQL-Environment
The SQL-environment is the highest-level context used by an application program in its calls to the CLI. A single-threaded application typically has one SQL-environment for the entire program. A multithreaded application may have 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.
19:
SQL APIs
/* Allocate a handle for use in subsequent CLI calls */ short SQLAllocHandle ( SQLSMALLINT SQLINTEGER SQLINTEGER HdlType, inHdl, *rtnHdl) /* IN: /* IN: integer handle type code */ environment or conn handle */
/* OUT: returned handle */
/* Free a handle previously allocated by SQLAllocHandle() */ SQLSMALLINT SQLFreeHandle ( SQLSMALLINT SQLINTEGER HdlType, inHdl) /* IN: /* IN: integer handle type code */ handle to be freed */
/* Allocate a handle for a new SQL-environment */ SQLSMALLINT SQLAllocEnv ( SQLINTEGER *envHdl) /* OUT: returned environment handle */
/* Free an environment handle previously allocated by SQLAllocEnv() */ SQLSMALLINT SQLFreeEnv ( SQLINTEGER envHdl) /* IN: environment handle */
/* Allocate a handle for a new SQL-connection */ SQLSMALLINT SQLAllocConnect ( SQLINTEGER SQLINTEGER envHdl, *connHdl) /* IN: environment handle */ /* OUT: returned handle */
/* Free a connection handle previously allocated */ SQLSMALLINT SQLFreeConnect ( SQLINTEGER connHdl) /* IN: connection handle */
/* Allocate resources for an SQL statement */ SQLSMALLINT SQLAllocStmt ( SQLINTEGER SQLINTEGER envHdl, *stmtHdl) /* IN: environment handle */
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