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When you execute a CREATE TABLE statement, you become the owner of the newly created table, which is given the name specified in the statement. The table name must be a legal SQL name, and it must not conflict with the name of one of your existing tables. The newly created table is empty, but the DBMS prepares it to accept data added with the INSERT statement.

If the number of parameters that will appear in a dynamic query is known in advance, the program can pass the parameter values to the DBMS through a list of host variables in the USING clause of the OPEN statement. As in the EXECUTE statement, the number of host variables must match the number of parameters; the data type of each host variable must be compatible with the type required by the corresponding parameter; and an indicator variable can be specified for each host variable, if necessary. Figure 18-13 shows a program excerpt where the dynamic query has three parameters whose values are specified by host variables. If the number of parameters is not known until runtime, the program must pass the parameter values using a SQLDA structure. This technique for passing parameter values was described for the EXECUTE statement earlier in the section EXECUTE with SQLDA. The same technique is used for the OPEN statement. Figure 18-14 shows a program excerpt like the one in Figure 18-13, except that it uses a SQLDA to pass parameters.

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The program in Figure 19-3 sends a single SQL statement to SQL Server and checks its status. If an application program must execute several SQL statements, it can repeat the dbcmd() / dbsqlexec() / dbresults() cycle for each statement. Alternatively, the program can send several statements as a single statement batch to be executed by SQL Server. Figure 19-4 shows a program that uses a batch of three SQL statements. As in Figure 19-3, the program calls dbcmd() to pass SQL text to dblib. The API simply

. . . /* Program has previously generated and prepared a SELECT statement like this one: SELECT A, B, C ... FROM SALESREPS WHERE SALES BETWEEN AND with two parameters to be specified */

main() { LOGINREC DBPROCESS /* Delete salespeople with low sales */ dbcmd(dbproc, delete from salesreps where sales < 10000.00"); /* Increase quota for salespeople with moderate sales */ dbcmd(dbproc, update salesreps set quota = quota + 10000.00"); dbcmd(dbproc, where sales <= 150000.00"); /* Increase quota for salespeople with high sales */ dbcmd(dbproc, update salesreps set quota = quota + 20000.00"); dbcmd(dbproc, where sales > 150000.00"); /* Ask SQL Server to execute the statement batch */ dbsqlexec(dbproc); /* if if if Check results of each (dbresults(dbproc) != (dbresults(dbproc) != (dbresults(dbproc) != of the three statements */ SUCCEED) goto do_error; SUCCEED goto do_error; SUCCEED goto do_error; *loginrec; *dbproc; /* data structure for login information */ /* data structure for connection */

/* Prompt the user for low & high values and do the query */ printf("Enter low end of sales range: "); scanf("%f", &low_end); printf("Enter high end of sales range: "); scanf("%f", &high_end); /*Open the cursor to start the query, passing parameters */ exec sql open qrycursor using :low_end, :high_end; . . .

Figure 19-4.

FIGURE 18-13

The columns of the newly created table are defined in the body of the CREATE TABLE statement. The column definitions appear in a comma-separated list enclosed in parentheses. The order of the column definitions determines the left-to-right order of the columns in the table. In the CREATE TABLE statements supported by the major DBMS brands, each column definition specifies: The column name, which is used to refer to the column in SQL statements. Every

19:

Part V:

concatenates the text from each call. Note that it s the program s responsibility to include any required spaces or punctuation in the passed text. SQL Server does not begin executing the statements until the program calls dbsqlexec(). In this example, three statements have been sent to SQL Server, so the program calls dbresults() three times in succession. Each call to dbresults() advances the API to the results of the next statement in the batch and tells the program whether the statement succeeded or failed. In the program shown in Figure 19-4, the programmer knows in advance that three statements are in the batch, and the programmer can code three corresponding calls to dbresults(). If the number of statements in the batch is not known in advance, the program can call dbresults() repeatedly until it receives the error code NO_MORE_ RESULTS. The program excerpt in Figure 19-5 illustrates this technique.

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