PHP pdostatement Objects Bindpram (), Bindvalue (), and Bindcolum

The difference between PHP Pdostatement object Bindpram (), Bindvalue (), and Bindcolumn

Pdostatement::bindparam― binds a parameter to the specified variable name.

Binds a PHP variable to the corresponding named placeholder or question mark placeholder in the SQL statement used as a preprocessing. Unlike Pdostatement::bindvalue (), this variable is bound as a reference and only takes its value when Pdostatement::execute () is called.

Pdostatement::bindvalue― binds a value to a parameter.

Binds a value to the corresponding named placeholder or question mark placeholder in the SQL statement that is used as a preprocessing.

 
  Prepare ("SELECT * from users where user =: User"); $user = "Jack";//Correct $stm->bindparam (": User", $user);//Error $stm-> Bindparam (": User", "Jack");//Correct $stm->bindvalue (": User", $user);//Correct $stm->bindvalue (": User", "Jack"); So using Bindparam is the second argument that can be used only with the variable name, not the variable value, and Bindvalue to the use of a specific value.?>

Pdostatement::bindcolumn― binds a column to a PHP variable.

Schedules a specific variable to be bound to a given column in a query result set. Each call to Pdostatement::fetch () or Pdostatement::fetchall () updates all variables bound to the column.

 
  Prepare ($sql);        $stmt, execute ();  /* Bind by column number  *        /$stmt bindcolumn (1,  $name);        $stmt-Bindcolumn (2,  $colour);  /* Bind by column name  *        /$stmt-bindcolumn (' calories ',  $cals);         while ($row  =  $stmt Fetch (PDO:: Fetch_bound)) {            $data  =  $name  .  " \ t "  .  $colour  .  " \ t "  .  $cals  .  " \ n ";            Print  $data;        }    }    catch (Pdoexception $e) {        print  $e-getMessage ();}    } ReadData ($DBH);? >

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The difference between PHP Pdostatement object Bindpram (), Bindvalue (), and Bindcolumn
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Extended Reading

"PHP Database PDO series" series of technical Articles to organize the collection

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2php Database Abstraction Layer PDO introduction and simple example

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4PHP 5 Data Object (PDO) abstraction layer with Oracle

5PHP Pdostatement:bindparam Insert Data error problem analysis

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7PHP Database Abstraction Layer PDO (a)?? Introduction and Installation Configuration

8PHP Database Abstraction Layer PDO (v)?? Error and error handling

9PHP Database Abstraction Layer PDO (iii)?? Transactions and Auto-commit

10PHP Database Abstraction Layer PDO (ii)?? Connection and connection management

11PHP Database Abstraction Layer PDO (four)?? Preprocessing statements and stored procedures

12PHP Database Abstraction Layer PDO (vii)?? Related classes and methods

13PHP Database Abstraction Layer PDO (vi)?? Large Object (lobs)

14PHP PDO Operation Summary

15PHP pdostatement The difference between Bindpram (), Bindvalue (), and Bindcolumn

16PDO preprocessing statement Pdostatement Object Usage Summary

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18PHP MySQL database operation class for PDO

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21php connecting the MSSQL Server DB instance with PDO

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