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SQL: The Complete Reference
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subsequent statements, it is only necessary to place new values in the application program buffer areas before the next call to SQLExecute(). Alternatively, the parameters can be rebound to different data areas within the application program by subsequent
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/* Program to raise selected user-specified customer credit limits */ #include <sqlcli.h> /* header file with CLI defs */ main() { SQLHENV env_hdl; SQLHDBC conn_hdl; SQLHSTMT stmt_hdl; SQLRETURN status; char *svr_name = demo ; char *user_name = joe ; char *user_pswd = xyz ; char int char int char amt_buf[31]; amt_ind = SQL_NTS; cust_buf[31]; cust_ind = SQL_NTS; stmt_buf[128]; /* /* /* /* /* /* /* /* /* /* /* /* SQL-environment handle */ connection handle */ statement handle */ CLI routine return status */ server name */ user name for connection */ user password for connection */ amount amount cust # cust # buffer entered by user */ ind (NULL-term string) */ entered by user */ ind (NULL-term string) */ for SQL statement */
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/* Allocate handles for SQL environment, connection, statement */ SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env_hdl); SQLAllocHandle(SQL_HANDLE_DBC, env_hdl, &conn_hdl); SQLAllocHandle(SQL_HANDLE_STMT, conn_hdl, &stmt_hdl); /* Connect to the database, passing server name, user, password */ /* SQL_NTS says NULL-terminated string instead of passing length */ SQLConnect(conn_hdl, svr_name, SQL_NTS, user_name, SQL_NTS, user_pswd, SQL_NTS); /* Prepare an UPDATE statement with parameter markers */ strcpy(stmt_buf, update customers set credit_limit = ); strcat(stmt_buf, where cust_num = ); SQLPrepare(stmt_hdl, stmt_buf, SQL_NTS);
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/ * Bind parameters to the program s buffers */ SQLBindParam(stmt_hdl,1,SQL_C_CHAR,SQL_DECIMAL,9,2,&amt_buf,&amt_ind); SQLBindParam(stmt_hdl,2,SQL_C_CHAR,SQL_INTEGER,0,0,&cust_buf,&cust_ind); / * Loop to process each credit limit change */ for ( ; ; ) { /* Prompt the user for the customer and new credit limit */ printf( Enter customer number: ); gets(cust_buf); if (strlen(cust_buf) == 0) break; printf( Enter new credit limit: ); gets(amt_buf); / * Execute the statement with the parameters */ status = SQLExecute(stmt_hdl); if (status) printf( Error during update\n ); else printf( Credit limit change successful.\n ); /* Commit the update */ SQLEndTran(SQL_HANDLE_ENV, env_hdl, SQL_COMMIT); } / * Disconnect, deallocate handles and exit */ SQLDisconnect(conn_hdl); SQLFreeHandle(SQL_HANDLE_STMT, stmt_hdl); SQLFreeHandle(SQL_HANDLE_DBC, conn_hdl); SQLFreeHandle(SQL_HANDLE_ENV, env_hdl); exit();
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Figure 19-15.
CLI program using input parameters (continued)
PROGRAMMING WITH SQL
calls to SQLBindParam(). Figure 19-15 shows a program that includes a SQL statement with two input parameters. The program repeatedly prompts the user for a customer number and a new credit limit for the customer. The values provided by the user become the input parameters to an UPDATE statement for the CUSTOMERS table.
SQL: The Complete Reference
The SQLParamData() and SQLPutData() calls in Figure 19-15 provide an alternative method of passing parameter data at runtime, called deferred parameter passing. The selection of this technique for a particular statement parameter is indicated in the corresponding call to SQLBindParam(). Instead of actually supplying a program data location to which the parameter is bound, the SQLBindParam() call indicates that deferred parameter passing will be used and provides a value that will later be used to identify the particular parameter being processed in this way. After statement execution is requested (by a SQLExecute() or SQLExecDirect() call), the program calls SQLParamData() to determine whether deferred parameter data is required by the statement. If so, the CLI returns a status code (SQL_NEED_DATA) along with an indicator of which parameter needs a value. The program then calls SQLPutData() to actually provide the value for the parameter. Typically, the program then calls SQLParamData() again to determine if another parameter requires dynamic data. The cycle repeats until all required dynamic data has been supplied, and SQL statement execution then continues normally. This alternative parameter-passing method is considerably more complex than the straightforward process of binding parameters to application program locations. It has two advantages. The first is that the actual passing of data values (and the allocation of storage to contain those values) can be delayed until the last possible moment when the data is actually needed. The second advantage is that the technique can be used to pass very long parameter values piece by piece. For selected long data types, the CLI allows repeated calls to SQLPutData() for the same parameter, with each call passing the next part of the data. For example, the text of a document that is supplied as a parameter for the VALUES clause of an INSERT statement might be passed in 1000-character pieces through repeated SQLPutData() calls until all of the document has been passed. This avoids the need to allocate a single very large memory buffer within the application program to hold the entire parameter value.
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