一个ORACLE分页程序，挺实用的. -pc6资讯

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Paging Test

// 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 database

putenv("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 query

OCIFreeStatement($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 formatting

echo "";

echo "";

echo "";

echo "";

echo "";

echo "";

echo "";

echo "";

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 "";

        for ($i = 1; $i < ($num_columns + 1); $i++) {

            $column_value = OCIResult($rs,$i);

            echo "";

        }

        echo "";

    }



} else {

    // Print a message stating that no records was found

    echo "";

}

// Close the table

echo "

PK ID	Field 1	Field 2	Field 3	Row No
$column_value
Sorry! No records was found

";

// free resources and close connection

OCIFreeStatement($rs);

OCILogoff($OracleDBConn);

?>

// Here we will print the links to the other pages

// Calculating the amount of pages

if ($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 page

if ($page != 1) {

    echo "Previous";

}

// Now we can print the links to the other pages

for ($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 " ".$i."";

    }

}

// If this is not the last page print a link to the next page

if ($page < $total_pages) {

    echo " Next";

}

?>

// I'm just adding this section to print some of the variables for extra info

// and some debugging

echo "

Total pages: ".$total_pages."

";

echo "

Number of records: ".$num_rows."

";

echo "

The SQL Query is: ".$sql."

";

?>