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/* Program to raise selected user-specified customer credit limits */ #include <sqlcli.h> main() { SQLHENV SQLHDBC SQLHSTMT SQLRETURN SQLCHAR SQLCHAR SQLCHAR char char char env_hdl; conn_hdl; stmt_hdl; status; *svr_name = "demo"; *user_name = "joe"; *user_pswd = "xyz"; amt_buf[31]; cust_buf[31]; 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 entered by user */ /* amount ind (NULL-term string) */ /* cust # entered by user */ /* cust # ind (NULL-term string) */ /* buffer for SQL statement */ /* header file with CLI defs */
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SQLINTEGER amt_ind = SQL_NTS; SQLINTEGER cust_ind = SQL_NTS;
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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); / * 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);
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FIGURE 19-21 CLI program using input parameters
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/ * 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 19-21 CLI program using input parameters (continued)
PART V
CLI Transaction Management
The COMMIT and ROLLBACK functions for SQL transaction processing also apply to SQL operation via the CLI. However, because the CLI itself must be aware that a transaction is being completed, the COMMIT and ROLLBACK SQL statements are replaced by the CLI SQLEndTran() call, shown in Figure 19-22. This call was used to commit the transactions in the program examples of Figures 19-17 and 19-21. The same CLI routine is used to execute either a COMMIT or a ROLLBACK operation; the particular operation to be performed is specified by the completion type parameter to the call. The CLI SQLCancel() call, also shown in Figure 19-22, does not actually provide a transaction management function, but in practice it is almost always used in conjunction with a ROLLBACK operation. It is used to cancel the execution of a SQL statement that was previously initiated by a SQLExecDirect() or SQLExecute() call. This would be appropriate in a program that is using deferred parameter processing, as described in the previous section.
Part V:
Programming with SQL
/* COMMIT or ROLLBACK a SQL transaction */ SQLSMALLINT SQLEndTran ( SQLSMALLINT SQLINTEGER SQLSMALLINT hdltype, txnHdl, compltype) /* IN: /* IN: /* IN: type of handle */ env, conn, or stmt handle */ txn typ (COMMIT/ROLLBACK) */
/* Cancel a currently executing SQL statement */ SQLSMALLINT SQLCancel ( SQLSMALLINT stmtHdl) /* IN: statement handle */
FIGURE 19-22 CLI transaction management routines
If the program determines that it should cancel the statement execution instead of supplying a value for a deferred parameter, the program can call SQLCancel() to achieve this result. The SQLCancel() call can also be used in a multithreaded application to cancel the effect of a SQLExecute() or SQLExecDirect() call that has not yet completed. In this situation, the thread making the original execute call will still be waiting for the call to complete, but another concurrently executing thread may call SQLCancel() using the same statement handle. The specifics of this technique, and how interruptible a CLI call is, tend to be very implementation dependent.
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