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Creating QR Code JIS X 0510 in Software PART V

PART V
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Part V:
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Programming with SQL
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main() { /* This is a simple general-purpose query program. It prompts After the user for a table name, and then asks the user which columns of the table are to be included in the query. requested query and displays the results. */ SQLHENV SQLHDBC SQLHSTMT SQLHSTMT SQLRETURN SQLCHAR SQLCHAR SQLCHAR char char char char int SQLCHAR 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; *nameptr; /* 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 */ the user's selections are complete, the program runs the
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SQLSMALLINT colcount; SQLSMALLINT namelen; SQLSMALLINT type; SQLSMALLINT size; SQLSMALLINT digits; SQLSMALLINT nullable; short char char char int short SQLCHAR i; inbuf[101]; *item_name[100]; *item_data[100]; item_ind[100]; item_type[100]; *dataptr;
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/* Open a connection to the demo database via CLI */ SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env_hdl);
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FIGURE 19-26
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Using CLI for a dynamic query
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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_name, SQL_NTS, /* 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);
PART V
FIGURE 19-26
Using CLI for a dynamic query (continued)
Part V:
Programming with SQL
/* 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) { case SQL_CHAR: case SQL_VARCHAR: /* Allocate buffer for string & bind the column to it */ item_data[i] = dataptr = malloc(size+1); 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;
FIGURE 19-26
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