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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. */ SQLHENV SQLHDBC SQLHSTMT SQLHSTMT SQLRETURN char char char char char char char int short char short short short short short short char char char int short char env_hdl; conn_hdl; stmt1_hdl; stmt2_hdl; status; *svr_name = demo ; *user_name = joe ; *user_pswd = xyz ; stmtbuf[2001]; stmt2buf[2001]; querytbl[32]; querycol[32]; first_col = 0; colcount; *nameptr; namelen; type; size; digits; nullable; i; inbuf[101]; *item_name[100]; *item_data[100]; item_ind[100]; item_type[100]; *dataptr; /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* /* SQL-environment handle */ connection handle */ statement handle for main query */ statement handle for col name query */ CLI routine return status */ server name */ user name for connection */ user password for connection */ main SQL query text to be executed */ SQL text for column name query */ user-specified query table */ user-specified column */ is this the first column chosen */ number of columns of query results */ address for CLI to return column name */ returned CLI column name length */ CLI data type code for column */ returned CLI column size */ returned CLI column # digits */ returned CLI nullability */ index for columns */ inp ut entered by user */ array to track column names */ array to track column buffers */ array of indicator variables */ array to track column data types */ address of buffer for current column */
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/* Open a connection to the demo database via CLI */ SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env_hdl); SQLAllocHandle(SQL_HANDLE_DBC, env_hdl, &conn_hdl); SQLAllocHandle(SQL_HANDLE_STMT, conn_hdl, &stmt1_hdl); SQLAllocHandle(SQL_HANDLE_STMT, conn_hdl, &stmt2_hdl); SQLConnect(conn_hdl, svr_name, SQL_NTS, user_name, SQL_NTS, user_pswd, SQL_NTS);
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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(stmtbuf, select ); /* Query the Information Schema to get column names */ strcpy(stmt2buf, select column_name from columns where table_name = ); strcat(stmt2buf, querytbl); SQLExecDirect(stmt2_hdl, stmt2buf, SQL_NTS); /* Process the results of the query */ SQLBindCol(stmt2_hdl, 1, SQL_C_CHAR, querycol, 31, (int *)0); while (status = SQLFetch(stmt2_hdl) == SQL_SUCCESS) { 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(stmtbuf,", ); strcat(stmtbuf, querycol); } } /* Finish the SELECT statement with a FROM clause */ strcat(stmtbuf, from ); strcat(stmtbuf, querytbl); /* Execute the query and get ready to fetch query results */ SQLExecDirect(stmt1_hdl, stmtbuf, SQL_NTS); /* Ask CLI to describe each column, allocate memory & bind it */ SQLNumResultCols(stmt1_hdl, &colcount); for (i =0; i < colcount; i++) { item_name[i] = nameptr = malloc(32); indptr = &item_ind[i]; SQLDescribeCol(stmt1_hdl, i, nameptr, 32, &namelen, &type, &size, &digits, &nullable); switch(type) {
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case SQL_CHAR: case SQL_VARCHAR: /* Allocate buffer for string & bind the column to it */ item_data[i] = dataptr = malloc(size+1);
Figure 19-20.
Using CLI for a dynamic query (continued)
SQL: The Complete Reference
item_type[i] = SQL_C_CHAR; SQLBindCol(stmt1_hdl, i, SQL_C_CHAR, dataptr, size+1, indptr); break; case SQL_TYPE_DATE: case SQL_TYPE_TIME: case SQL_TYPE_TIME_WITH_TIMEZONE: case SQL_TYPE_TIMESTAMP: case SQL_TYPE TIMESTAMP_WITH_TIMEZONE: case SQL_INTERVAL_DAY: case SQL_INTERVAL_DAY_TO_HOUR: case SQL_INTERVAL_DAY_TO_MINUTE: case SQL_INTERVAL_DAY_TO_SECOND: case SQL_INTERVAL_HOUR: case SQL_INTERVAL_HOUR_TO_MINUTE: case SQL_INTERVAL_HOUR_TO_SECOND: case SQL_INTERVAL_MINUTE: case SQL_INTERVAL_MINUTE_TO_SECOND: case SQL_INTERVAL_MONTH: case SQL_INTERVAL_SECOND: case SQL_INTERVAL_YEAR: case SQL_INTERVAL_YEAR_TO_MONTH: /* Request ODBC/CLI conversion of these types to C-strings */ item_data[i] = dataptr = malloc(31); item_type[i] = SQL_C_CHAR; SQLBindCol(stmt1_hdl, i, SQL_C_CHAR, dataptr, 31, indptr); break; case SQL_INTEGER: case SQL_SMALLINT: /* Convert these types to C long integers */ item_data[i] = dataptr = malloc(sizeof(integer)); item_type[i] = SQL_C_SLONG; SQLBindCol(stmt1_hdl, i, SQL_C_SLONG, dataptr, sizeof(integer), indptr); break; case SQL_NUMERIC: case SQL_DECIMAL: case SQL_FLOAT: case SQL_REAL: case SQL_DOUBLE: /* For illustration, convert these types to C double floats */ item_data[i] = dataptr = malloc(sizeof(long)); item_type[i] = SQL_C_DOUBLE; SQLBindCol(stmt1_hdl, i, SQL_C_DOUBLE, dataptr, sizeof(double), indptr); break;
Figure 19-20.
Using CLI for a dynamic query (continued)
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