<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD><TITLE>Paging Test</TITLE><META NAME="Generator" CONTENT="TextPad 4.0"><META NAME="Author" CONTENT="?"><META NAME="Keywords" CONTENT="?"><META NAME="Description" CONTENT="?"></HEAD><BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#FF0000" VLINK="#800000" ALINK="#FF00FF" BACKGROUND="?"><?php// How to split the result into pages, like "limits" in MySQL?// ===========================================================// Tutorial by Neil Craig (neilc@netactive.co.za)// Date: 2001-06-05// With this example, I will explain paging of database queries where the// result is more than the developer want to print to the page, but wish to // split the result into seperate pages.// The table "SAMPLE_TABLE" accessed in this tutorial has 4 fields:// PK_ID, FIELD1, FIELD2 and FIELD3. The types don"t matter but you should// define a primary key on the PK_ID field.$display_rows = 5; // The rows that should be display at a time. You can // modify this if you like.// Connect to the Oracle databaseputenv("ORACLE_SID=purk");putenv("ORACLE_HOME=/export/oracle8i");putenv("TNS_ADMIN=$ORACLE_HOME/network/admin");$OracleDBConn = OCILogon("purk","purk","lengana.world");// This query counts the records$sql_count = "SELECT COUNT(*) FROM SAMPLE_TABLE";// Parse the SQL string & execute it$row_count=OCIParse($OracleDBConn, $sql_count); OCIExecute($row_count);// From the parsed & executed query, we get the amount of records found.// I"m not storing this result into a session variable because it allows for// new records to be shown as it is entered by another user while the result// is printed.if (OCIFetch($row_count)) { $num_rows = OCIResult($row_count,1);} else { $num_rows = 0; // If no record was found}// Free the resources that were used for this queryOCIFreeStatement($row_count);// We need to prepare the query that will print the results as a page. I will // explain the query to you in detail.// If no page was specified in the url (ex. http://mysite.com/result.php?page=2),// set it to page 1.if (empty($page) || $page == 0) { $page = 1;}// The start range from where the results should be printed$start_range = (($page - 1) * $display_rows) + 1;// The end range to where the results should be printed$end_range = $page * $display_rows;// The main query. It consists of 3 "SELECT" statements nested into each// other. The center query is the query you would normally use to return the// records you want. Do you ordering and "WHERE" clauses in this statement.// We select the rows to limit our results but because the row numbers are// assigned to the rows before any ordering is done, lets the code print the// result unsorted.// The second nested "SELECTED" assigns the new row numbers to the result// for us to select from.$sql = "SELECT PK_ID, FIELD1, FIELD2, FIELD3, ROW_NO FROM (SELECT PK_ID, ";$sql .= "FIELD1, FIELD2, FIELD3, ROWNUM ROW_NO FROM (SELECT PK_ID, FIELD1, ";$sql .= "FIELD2, FIELD3 FROM SAMPLE_TABLE ORDER BY FIELD3)) WHERE ROW_NO BETWEEN ";$sql .= $start_range." AND ".$end_range;// start results formattingecho "<table width="95%" border="1" cellspacing="1" cellpadding="2" align="center">";echo "<tr bgcolor="#666666">"; echo "<td><b><font color="#FFFFFF">PK ID</font></b></td>";echo "<td><b><font color="#FFFFFF">Field 1</font></b></td>";echo "<td><b><font color="#FFFFFF">Field 2</font></b></td>";echo "<td><b><font color="#FFFFFF">Field 3</font></b></td>";echo "<td><b><font color="#FFFFFF">Row No</font></b></td>";echo "</tr>";if ($num_rows != 0) { // Parse the SQL string & execute it $rs=OCIParse($OracleDBConn, $sql); OCIExecute($rs); // get number of columns for use later $num_columns = OCINumCols($rs); while (OCIFetch($rs)){ echo "<tr>"; for ($i = 1; $i < ($num_columns + 1); $i++) { $column_value = OCIResult($rs,$i); echo "<TD>$column_value</TD>"; } echo "</tr>"; }} else { // Print a message stating that no records was found echo "<tr><td align=center>Sorry! No records was found</td></tr>";}// Close the tableecho "</TABLE>";// free resources and close connectionOCIFreeStatement($rs);OCILogoff($OracleDBConn);?><div align=center><?php// Here we will print the links to the other pages// Calculating the amount of pagesif ($num_rows % $display_rows == 0) { $total_pages = $num_rows / $display_rows;} else { $total_pages = ($num_rows / $display_rows) + 1; settype($total_pages, integer); // Rounding the variable}// If this is not the first page print a link to the previous pageif ($page != 1) { echo "<a href="".$PHP_SELF."?page=".($page - 1)."">Previous</a>";}// Now we can print the links to the other pagesfor ($i = 1; $i <= $total_pages; $i++) { if ($page == $i){ // Don"t print the link to the current page echo " ".$i; } else { //Print the links to the other pages echo " <a href="".$PHP_SELF."?page=".$i."">".$i."</a>"; }}// If this is not the last page print a link to the next pageif ($page < $total_pages) { echo " <a href="".$PHP_SELF."?page=".($page + 1)."">Next</a>";}?></div><?php// I"m just adding this section to print some of the variables for extra info// and some debuggingecho "<p><b>Total pages: </b>".$total_pages."</p>";echo "<p><b>Number of records: </b>".$num_rows."</p>";echo "<p><b>The SQL Query is:</b> ".$sql."</p>";?></BODY></HTML>
