<?php

if (! $TABLE_INCLUDED) {

   $TABLE_INCLUDED = 1;

   // Define the Table class
   // - This assumes we have already connected to the database

   class Table
   {

      var $table_name;

      var $column_names = array();
      var $column_types = array();
      var $column_nulls = array();
      var $key_columns  = array();
      var $num_columns;

      var $columns      = array();

      var $userdata;
      var $err;
      var $err_no;


      //
      // Initialize the table data object with column and key information
      //
      function Table($table_name) {

         // Setup main parameters
         $this->table_name = $table_name;

         // Get table information
         $query = "show columns from $table_name";
         $result = mysql_query($query);

         if (! $result) {
            $this->err    = mysql_error();
            $this->err_no = 103;
            return;
         }


         // Get column information
         $c = 0;
         $data = array();

         while ($row = mysql_fetch_array($result)) {
            $data[$c] = $row;
            $c++;
         }

         $this->num_columns = count($data);
         $this->columns = $data;

         for ($i = 0; $i < $this->num_columns; $i++) {
            $row = $data[$i];

            $name  = $row[0];

            $type  = ereg_replace("\(.*\)", "", $row[1]);
            $type  = ereg_replace(" unsigned", "", $type);

            $null  = ($row[2] ? "Y" : "N");

            $key   = $row[3];

            $this->column_names[$i] = $name;
            $this->column_types[$i] = $type;
            $this->column_nulls[$i] = $null;
            $this->key_columns[$i]  = ($key == "PRI");

            $this->column_types[$name] = $type;
            $this->column_nulls[$name] = $null;
            $this->key_columns[$name]  = ($key == "PRI");
         }

         $this->err_no = 0;

      } // End of Table() function


      //
      // Display the table structure in report format
      //
      function ShowTable() {

         printf("<B>      Table: $this->table_name</B>\n\n");

         printf("<B>      %-20s %-15s %-15s% -15s</B>\n",
                "Column", "Type", "Null", "Pri");

         for ($i = 0; $i < count($this->column_names); $i++) {
            printf("%4d  %-20s %-15s %-15s %-15s\n",
                   $i + 1,
                   $this->column_names[$i],
                   $this->column_types[$i],
                   $this->column_nulls[$i],
                   $this->key_columns[$i]);
         }

         return;

      } // End of ShowTable() function


      //
      // Display table structure in SQL format
      //
      function ShowStructure() {

         print("create table $this->table_name (\n");

         for ($i = 0; $i < count($this->columns); $i++) {
            $row = $this->columns[$i];

            $name  = $row[0];
            $type  = $row[1];
            $null  = ($row[2] ? "" : " not null");

            switch ($row[3]) {
             case "PRI":
               if ($primary) $primary .= ", ";
               $primary .= $name;
               break;

             case "UNI":
               $unique .= "  unique ($name),\n";
               break;

             case "MUL":
               $index .= "  index ($name),\n";
               break;

             default:
               if ($row[3]) printf("%s - ", $row[3]);
            }

            printf("  %-20s%s%s,\n", $name, $type, $null);
         }

         printf("\n");

         if ($unique) {
            printf("%s\n", $unique);
         }

         if ($index) {
            printf("%s\n", $index);
         }

         if ($primary) {
            printf("  primary key (%s)\n", $primary);
         }

         print(");\n\n");
         return;

      } // End of ShowStructure() function


      //
      // Build an SQL query statement based on the current values
      // of GLOBALS variables
      //
      // - This assumes that all values that are set in GLOBALS are to be used.
      //   It may be a problem if lingering data is in the GLOBALS array
      //
      function BuildQuery($orderby_fields="",$special_where="",$prefix="") {
         // Initialize variables
         $query = "";

         $where = "$special_where";
         $orderby = "";

         $col = 0;
         $ord = 0;

         // Process each field in the table
         for ($i = 0; $i < count($this->column_names); $i++) {
            $name = $this->column_names[$i];
            $data = $GLOBALS[$name];

            if (! empty($data) && $data != "NULL") {
               // If there is a column already in the where clause add 'and'
               if ($where) {
                  $where .= " and ";
               }

               // LIKE WILDCARD
               if (ereg("[\*\?%]", $data)) {
                  $data = ereg_replace("[\*]", "%", $data);
                  $where .= "$prefix$name like " . $this->FieldData($name, $data);
               }
               // NOT EQUAL TO
               elseif (ereg("^!= ",$data)) {
                  $data = ereg_replace("^!= ","",$data);
                  $where .= "$prefix$name != " . $this->FieldData($name, $data);
               }
               // LESS THAN OR EQUAL TO
               elseif (ereg("^<= ",$data)) {
                  $data = ereg_replace("^<= ","",$data);
                  $where .= "$prefix$name <= " . $this->FieldData($name, $data);
               }
               // LESS THAN
               elseif (ereg("^< ",$data)) {
                  $data = ereg_replace("^< ","",$data);
                  $where .= "$prefix$name < " . $this->FieldData($name, $data);
               }
               // GREATER THAN OR EQUAL TO
               elseif (ereg("^>= ",$data)) {
                  $data = ereg_replace("^>= ","",$data);
                  $where .= "$prefix$name >= " . $this->FieldData($name, $data);
               }
               // GREATER THAN
               elseif (ereg("^> ",$data)) {
                  $data = ereg_replace("^> ","",$data);
                  $where .= "$prefix$name > " . $this->FieldData($name, $data);
               }
               // EQUAL TO
               else {
                  $where .= "$prefix$name = " . $this->FieldData($name, $data);
               }

               $col = 1;
            }

            // Build order by part based on field sequence
            if ($name != "record_num" && $this->key_columns[$i]) {
               if ($ord) {
                  $orderby .= ",";
               }

               $orderby .= "$prefix$name";
               $ord = 1;
            }
         }

         // Build up the statement
         $query = "select * from $this->table_name";

         // If where clause then append it
         if ($where) {
            $query .= " where $where";
         }

         // If there is an orderby clause append it
         if ($orderby_fields) {
            $query .= " order by " . $orderby_fields;
         }
         else {
            if ($ord) {
               $query .= " order by $orderby";
            }
         }

         return $query;

      } // End of BuildQuery() function


      //
      // Build the set of hidden fields for this table
      // - This function has probably been replaced with the script:
      //   "hidden-form-fields.php"
      //
      function BuildHidden() {
         // Initialize variables
         $hidden = "";

         $col = 0;
         $ord = 0;

         // Process each field in the table
         for ($i = 0; $i < count($this->column_names); $i++) {
            $name = $this->column_names[$i];
            $data = mysql_real_escape_string($GLOBALS[$name]);

            $hidden .= "<INPUT TYPE=\"HIDDEN\" NAME=\"$name\" VALUE=\"$data\">\n";
         }

         return $hidden;

      } // End of BuildHidden() function


      //
      // Build an SQL insert statement based on the values in the GLOBALS array
      //
      function BuildInsert($include_record_num='No') {
         // Initialize variables
         $query = "";

         $q1 = "insert into $this->table_name (";
         $q2 = "values (";

         // Process each field in the table
         for ($i = 0; $i < count($this->column_names); $i++) {
            $name = $this->column_names[$i];
            $data = $GLOBALS[$name];

            if ($name != "record_num" || $include_record_num == 'Yes') {
               // If there is a column already in the string add a comma
               if ($i) {
                  $q1 .= ", ";
                  $q2 .= ", ";
               }

               $q1 .= $name;
               $q2 .= $this->FieldData($name, $data);
            }
         }

         $query = $q1 . ") " . $q2 . ")";
         return $query;

      } // End of BuildInsert() function


      //
      // Build an SQL update statement based on the values in the GLOBALS array
      //
      function BuildUpdate($mode="single") {
         // Initialize variables
         $query = "update $this->table_name set ";
         $update = "";

         // Process each field in the table
         for ($i = 0; $i < count($this->column_names); $i++) {
            $name = $this->column_names[$i];

            if (($name != "record_num") && (isset($GLOBALS[$name]))) {
               // If there is a column already in the string add a comma
               $value = $this->FieldData($name, $GLOBALS[$name]);

               // Single record update statement
               if ($mode == "single") {
                  if ($update)   $update .= ", ";
                  $update .= $name . " = " . $value;
               }
               
               // Multi record update statement
               if ($mode == "multi") {
                  if ($value == "''")     $value = NULL;
                  if ($value == "NULL")   $value = NULL;
                  if ($value == "0")      $value = NULL;

                  if ($value) {
                     if ($update)   $update .= ", ";
                     $update .= $name . " = " . $value;
                  }
               }

               $col = 1;
            }
         }

         // Define the where clause
         $where_clause = "";
         if ($mode == "single") {
            $record_num = intval($GLOBALS["record_num"]);
            $where_clause = "where record_num = $record_num";
         }

         $query = "$query $update $where_clause";

         return $query;

      } // End of BuildUpdate() function


      //
      // Format the data correctly based on the field type in
      // the table structure
      //
      function FieldData($field_name, $data) {
         $value = "";

         $type = $this->column_types[$field_name];
         $null = $this->column_nulls[$field_name];

         $data = trim($data);

         // format data based on field type
         switch ($type) {
          case "varchar":
          case "text":
          case "longtext":
          case "char":
          case "time":
          case "enum":
            $data = mysql_real_escape_string($data);
            $value = "'$data'";
            break;

          case "int":
          case "smallint":
          case "decimal":
            if (strlen($data) == 0) {
               if ($null == "Y") {
                  $value = "NULL";
               }
               else {
                  $value = "0";
               }
            }
            else {
               if ($type == 'decimal') $value = floatval($data);
               else $value = intval($data);
            }
            break;

          case "date":
            if (empty($data)) {
               if ($null == "Y") {
                  $value = "NULL";
               }
               else {
                  $dt = date("Y-m-d", time());
                  $value = "'$dt'";
               }
            }
            else {
               $data = mysql_real_escape_string($data);
               $value = "'$data'";
            }
            break;

          case "datetime":
            if (! $data) {
               $dt = date("Y-m-d H:i:s", time());
               $value = "'$dt'";
            }
            else {
               $data = mysql_real_escape_string($data);
               $value = "'$data'";
            }
            break;

          case "timestamp":
            if (! $data) {
               $dt = date("YmdHis", time());
               $value = "'$dt'";
            }
            else {
               $data = mysql_real_escape_string($data);
               $value = "'$data'";
            }
            break;

          default:
            $data = mysql_real_escape_string($data);
            $value = "'$data'";
         }

         // return the correctly formatted data
         return $value;

      } // End of FieldData() function


      //
      // Function to convert a data record into GLOBALS data
      //
      function RecordData($record) {

         // Process each field in the table
         for ($i = 0; $i < count($this->column_names); $i++) {
            $name = $this->column_names[$i];
            $GLOBALS[$name] = $record[$name];
         }

      } // End of RecordData() function


   }  // End of class definition

} // End of if TABLE_INCLUDED statement

?>