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0 1 100 99 1 2 Table 19-3.
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Statement completed successfully Successful completion with warning No data found (when retrieving query results) Data needed (required dynamic parameter missing)
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The CLI manages interactions between an application program and a supported database through a hierarchy of concepts, reflected in a hierarchy of CLI data structures: I SQL-environment. The highest-level environment within which database access takes place. The CLI uses the data structure associated with a SQL-environment to keep track of the various application programs that are using it. I SQL-connection. A logical connection to a specific database server. Conceptually, the CLI allows a single application program to connect to several different database servers concurrently. Each connection has its own data structure, which the CLI uses to track connection status. I SQL-statement. An individual SQL statement to be processed by a database server. A statement may move through several stages of processing, as the DBMS prepares (compiles) it, executes it, processes any errors, and in the case of queries, returns the results to the application program. Conceptually, an application program may have multiple SQL statements moving through these processing stages in parallel. Each statement has its own data structure, which the CLI uses to track its progress. 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 storage 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 19-12. 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. 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
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19:
SQL APIs
/* Allocate a handle for use in subsequent CLI calls */ short SQLAllocHandle ( short HdlType, /* IN: integer handle type code */ long inHdl, /* IN: environment or conn handle */ long *rtnHdl) /* OUT: returned handle */ /* Free a handle previously allocated by SQLAllocHandle() */ short SQLFreeHandle ( short HdlType, /* IN: integer handle type code */ long inHdl) /* IN: handle to be freed */ /* Allocate a handle for a new SQL-environment */ short SQLAllocEnv ( long *envHdl) /* OUT: returned environment handle */ /* Free an environment handle previously allocated by SQLAllocEnv() */ short SQLFreeEnv ( long envHdl) /* IN: environment handle */ /* Allocate a handle for a new SQL-connection */ short SQLAllocConnect ( long envHdl, /* IN: environment handle */ long *connHdl) /* OUT: returned handle */ /* Free a connection handle previously allocated */ short SQLFreeConnect ( long connHdl) /* IN: connection handle */ short SQLAllocStmt ( long envHdl, long *stmtHdl)
/* IN: environment handle */ /* OUT: statement handle */
/* Free a connection handle previously allocated */ short SQLFreeStmt ( long stmtHdl, /* IN: statement handle */ long option) /* IN: cursor and unbind options */
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