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MySQL Tutorial - What Is a Result Set Object

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What Is a Result Set Object?

A result set object is a logical representation of data rows returned by mysql_query() function on SELECT statements. Every result set object has an internal pointer used to identify the current row in the result set. Once you get a result set object, you can use the following functions to retrieve detail information:

  • mysql_free_result($res) - Closes this result set object.
  • mysql_num_rows($res) - Returns the number rows in the result set.
  • mysql_num_fields($res) - Returns the number fields in the result set.
  • mysql_fetch_row($res) - Returns an array contains the current row indexed by field position numbers.
  • mysql_fetch_assoc($res) - Returns an array contains the current row indexed by field names.
  • mysql_fetch_array($res) - Returns an array contains the current row with double indexes: field position numbers and filed names.
  • mysql_fetch_lengths($res) - Returns an array contains lengths of all fields in the last row returned.
  • mysql_field_name($res, $i) - Returns the name of the field of the specified index.

(Continued on next topic...)

  1. How To Create a New Table?
  2. How To Get the Number of Rows Selected or Affected by a SQL Statement?
  3. How To Insert Data into an Existing Table?
  4. How To Fix the INSERT Command Denied Error?
  5. How To Insert Multiple Rows with a SELECT Statement?
  6. What Is a Result Set Object?
  7. How To Query Tables and Loop through the Returning Rows?
  8. How To Break Query Output into Pages?
  9. How To Update Existing Rows in a Table?
  10. How To Delete Existing Rows in a Table?
  11. How To Quote Text Values in SQL Statements?
  12. How To Quote Date and Time Values in SQL Statements?
  13. How To Display a Past Time in Days, Hours and Minutes?
  14. How To Perform Key Word Search in Tables?
  15. How To Build WHERE Criteria with Web Form Search Fields?
  16. How To Query Multiple Tables Jointly?
  17. How To Define the ID Column as Auto-Incremented?
  18. How To Get the Last ID Assigned by MySQL?

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