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This article introduces the relevant knowledge of "the operation function arrangement of codeigniter database". In the operation process of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The copy code is as follows:

/ / query:

$query = $this- > db_query ("SELECT * FROM table")

= =

/ / result () returns an array of objects

$data = $query- > result ()

/ / result_array () returns data

$data = $query- > result_array ()

/ / row () only returns an array of objects

$data = $query- > row ()

/ / num_rows () returns the number of rows of query results

$data = $query- > num_rows ()

/ / num_fields () returns the number of fields requested by the query

$data = $query- > num_fields ()

/ / row_array () returns only a row of arrays

$data = $query- > row_array ()

/ / free_result () frees the memory occupied by the current query and deletes the associated resource identity

$data = $query- > free_result ()

/ *

= =

Insert operation

= =

, /

/ / ID generated by the last insert operation

Echo $this- > db- > insert_id ()

/ / number of rows affected by write and update operations

Echo $this- > db- > affected_rows ()

/ / returns the total number of rows of the specified table

Echo $this- > db- > count_all ('table_name')

/ / output the current database version number

Echo $this- > db- > version ()

/ / output the current database platform

Echo $this- > db- > platform ()

/ / returns the last run query statement

Echo $this- > db- > last_query ()

/ / insert data, the inserted data will be automatically converted and filtered, for example:

/ / $data = array ('name' = > $name,' email' = > $email, 'url' = > $url)

$this- > db- > insert_string ('table_name', $data)

/ *

= =

Update operation

= =

, /

/ / update the data, and the updated data will be automatically converted and filtered, for example:

/ / $data = array ('name' = > $name,' email' = > $email, 'url' = > $url)

/ / $where = "author_id = 1 AND status = 'active'"

$this- > db- > update_string ('table_name', $data, $where)

/ *

= =

Select data

= =

, /

/ / get all the data of the table

$this- > db- > get ('table_name')

/ / the second parameter is the number of output entries, and the third parameter is the start position.

$this- > db- > get ('table_name', 10,20)

/ / get data. The first parameter is the table name, the second is the acquisition condition, and the third is the number of entries.

$this- > db- > get_where ('table_name', array (' id'= > $id), $offset)

/ / obtain data by select

$this- > db- > select ('title, content, date')

$data = $this- > db- > get ('table_name')

/ / get the maximum value of the field. The second parameter is an alias, which is equivalent to max (age) AS nianling

$this- > db- > select_max ('age')

$this- > db- > select_max ('age',' nianling')

/ / get the minimum value of the field

$this- > db- > select_min ('age')

$this- > db- > select_min ('age',' nianling')

/ / get the sum of the field

$this- > db- > select_sum ('age')

$this- > db- > select_sum ('age',' nianling')

/ / Custom from table

$this- > db- > select ('title', content, date')

$this- > db- > from ('table_name')

/ / query condition WHERE name = 'Joe' AND title = "boss" AND status =' active'

$this- > db- > where ('name', $name)

$this- > db- > where ('title', $title)

$this- > db- > where ('status', $status)

/ / scope query

$this- > db- > where_in ('item1',' item2')

$this- > db- > where_not_in ('item1',' item2')

/ / match. The third parameter is the matching pattern title LIKE'% match%'.

$this- > db- > like ('title',' match', 'before/after/both')

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