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SQL APIs
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main() { /* This is a simple general-purpose query program. It prompts the user for a table name and then asks the user which columns of the table are to be included in the query. After the user's selections are complete, the program runs the requested query and displays the results. */ LOGINREC char char char int int int int char char char int char int *loginrec; stmbuf[2001]; querytbl[32]; querycol[32]; status; first_col = 0; colcount; i; inbuf[101]; *item_name[100]; *item_data[100]; item_type[100]; *address; length; /* data structure for login information */ /* data structure for connection */ /* SQL text to be executed */ /* user-specified table */ /* user-specified column */ /* dblib return status */ /* is this the first column chosen */ /* number of columns of query results */ /* index for columns */ /* input entered by user */ /* array to track column names */ /* array to track column buffers */ /* array to track column data types */ /* address of buffer for current column */ /* length of buffer for current column */
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DBPROCESS *dbproc;
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/* Open a connection to SQL Server */ loginrec = dblogin(); DBSETLUSER(loginrec, "scott"); DBSETLPWD (loginrec, "tiger"); dbproc = dbopen(loginrec, "");
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/* Prompt the user for which table to query */ printf("*** Mini-Query Program ***\n"); printf("Enter name of table for query: "); gets(querytbl); /* Start the SELECT statement in the buffer */ strcpy(stmbuf, "select ");
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FIGURE 19-15
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Using dblib for a dynamic query (continued)
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/* Query the SQL Server system catalog to get column names */ dbcmd(dbproc, "select name from syscolumns "); dbcmd(dbproc, "where id = (select id from sysobjects "); dbcmd(dbproc, "where type = 'U' and name = "); dbcmd(dbproc, querytbl); dbcmd(dbproc, ")"); dbsqlexec(dbproc); /* Process the results of the query */ dbresults(dbproc); dbbind(dbproc, querycol); while (status = dbnextrow(dbproc) == SUCCEED) { printf("Include column %s (y/n) ", querycol); gets(inbuf); if (inbuf[0] == 'y') { /* User wants the column; add it to the select list */ if (first_col++ > 0) strcat(stmbuf, ", "); strcat(stmbuf, querycol); } } /* Finish the SELECT statement with a FROM clause */ strcat(stmbuf, "from "); strcat(stmbuf, querytbl); /* Execute the query and advance to the query results */ dbcmd(dbproc, stmbuf); dbsqlexec(dbproc); dbresults(dbproc); /* Ask dblib to describe each column, allocate memory, and bind it */ colcount = dbnumcols(dbproc); for (i = 0; i < colcount; i++) { item_name[i] = dbcolname(dbproc, i); type = dbcoltype(dbproc, i); switch(type) { 3 2 1
FIGURE 19-15
Using dblib for a dynamic query
19:
SQL APIs
case SQLCHAR: case SQLTEXT: case SQLDATETIME: length = dbcollen(dbproc, i) + 1; item_data[i] = address = malloc(length); item_type[i] = NTBSTRINGBIND; dbbind(dbproc, i, NTBSTRINGBIND, length, address); break; case SQLINT1: case SQLINT2: case SQLINT4: item_data[i] = address = malloc(sizeof(long)): item_type[i] = INTBIND; dbbind(dbproc, i, INTBIND, sizeof(long), address); break; case SQLFLT8: case SQLMONEY: item_data[i] = address = malloc(sizeof(double)); item_type[i] = FLT8BIND; dbbind(dbproc, i, FLT8BIND, sizeof(double), address); break; } } /* Fetch and display the rows of query results */ while (status = dbnextrow(dbproc) == SUCCEED) { /* Loop, printing data for each column of the row */ printf("\n"); for (i = 0; i < colcount; i++) { /* Find the SQLVAR for this column; print column label */ printf("Column # %d (%s): ", i+1, item_name[i]; /* Handle each data type separately */ switch(item_type[i]) { 5 4
PART V
FIGURE 19-15
Using dblib for a dynamic query (continued)
Part V:
Programming with SQL
case NTBSTRINGBIND: /* Text data just display it */ puts(item_data[i]); break; case INTBIND: /* Four-byte integer data convert & display it */ printf("%lf", *((double *) (item_data[i]))); break; case FLT8BIND: /* Floating-point data convert & display it */ printf("%lf", *((double *) (item_data[i]))); break; } } } printf("\nEnd of data.\n"); /* Clean up allocated storage */ for (i = 0; i < colcount; i++) { free(item_data[i]); } dbexit(dbproc); exit(); }
FIGURE 19-15
Using dblib for a dynamic query (continued)
The dblib-based program in Figure 19-15 performs exactly the same function as the dynamic embedded SQL program in Figure 18-9, reproduced here as Figure 19-16. It s instructive to compare the two programs and the techniques they use: For both embedded SQL and dblib, the program builds a SELECT statement in its buffers and submits it to the DBMS for processing. With dynamic SQL, the special PREPARE statement handles this task; with the SQL Server API, the standard dbcmd() and dbsqlexec() functions are used. For both interfaces, the program must request a description of the columns of query results from the DBMS. With dynamic SQL, the special DBNUMCOLS() statement handles this task, and the description is returned in a SQLDA data structure. With dblib, the description is obtained by calling API functions. Note that the program in Figure 19-15 maintains its own arrays to keep track of the column information.
19:
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