MySQL INSERT Query ~ Java Tutorials by Experts

Friday, October 31, 2014

MySQL INSERT Query

To insert data into MySQL table, you would need to use SQL INSERT INTO command. You can insert data into MySQL table by using mysql> prompt or by using any script like PHP.

Syntax:

Here is generic SQL syntax of INSERT INTO command to insert data into MySQL table:

INSERT INTO table_name ( field1, field2,...fieldN )
                       VALUES
                       ( value1, value2,...valueN );

To insert string data types, it is required to keep all the values into double or single quote, for example:- "value".

Inserting Data from Command Prompt:

This will use SQL INSERT INTO command to insert data into MySQL table tutorials_tbl.

Example:

Following example will create 3 records into tutorials_tbl table:

root@host# mysql -u root -p password;
Enter password:*******
mysql> use JAVATUTORIALS;
Database changed
mysql> INSERT INTO javatutorials_tbl 
     ->(javatutorial_title, javatutorial_author, submission_date)
     ->VALUES
     ->("Learn PHP", "John Poul", NOW());
Query OK, 1 row affected (0.01 sec)
mysql>  INSERT INTO javatutorials_tbl 
     ->(javatutorial_title, javatutorial_author, submission_date)
     ->VALUES
     ->("Learn PHP", "Darshan", NOW());
Query OK, 1 row affected (0.01 sec)
mysql>  INSERT INTO javatutorials_tbl 
     ->(javatutorial_title, javatutorial_author, submission_date)
     ->VALUES
     ->("Learn PHP", "Gemini", '2007-07-07');
Query OK, 1 row affected (0.01 sec)
mysql>

NOTE: Please note that all the arrow signs (->) are not part of SQL command; they are indicating a new line and they are created automatically by MySQL prompt while pressing enter key without giving a semicolon at the end of each line of the command.
In the above example, we have not provided tutorial_id because at the time of table creation, we had given AUTO_INCREMENT option for this field. So MySQL takes care of inserting these IDs automatically. Here, NOW() is a MySQL function, which returns current date and time.

Inserting Data Using PHP Script:

You can use same SQL INSERT INTO command into PHP function mysql_query() to insert data into a MySQL table.

Example:

This example will take three parameters from user and will insert them into MySQL table:

<html>
<head>
<title>Add New Record in MySQL Database</title>
</head>
<body>
<?php
if(isset($_POST['add']))
{
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}

if(! get_magic_quotes_gpc() )
{
   $tutorial_title = addslashes ($_POST[' javatutorial_title']);
   $tutorial_author = addslashes ($_POST[' javatutorial_author']);
}
else
{
   $tutorial_title = $_POST[' javatutorial_title'];
   $tutorial_author = $_POST[' javatutorial_author'];
}
$submission_date = $_POST['submission_date'];

$sql = "INSERT INTO javatutorials_tbl ".
       "( javatutorial_title, javatutorial_author, submission_date) ".
       "VALUES ".
       "('$tutorial_title','$tutorial_author','$submission_date')";
mysql_select_db('TUTORIALS');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
  die('Could not enter data: ' . mysql_error());
}
echo "Entered data successfully\n";
mysql_close($conn);
}
else
{
?>
<form method="post" action="<?php $_PHP_SELF ?>">
<table width="600" border="0" cellspacing="1" cellpadding="2">
<tr>
<td width="250">Tutorial Title</td>
<td>
<input name=" javatutorial_title" type="text" id=" javatutorial_title">
</td>
</tr>
<tr>
<td width="250">Tutorial Author</td>
<td>
<input name=" javatutorial_author" type="text" id=" javatutorial_author">
</td>
</tr>
<tr>
<td width="250">Submission Date [ yyyy-mm-dd ]</td>
<td>
<input name="submission_date" type="text" id="submission_date">
</td>
</tr>
<tr>
<td width="250"> </td>
<td> </td>
</tr>
<tr>
<td width="250"> </td>
<td>
<input name="add" type="submit" id="add" value="Add Tutorial">
</td>
</tr>
</table>
</form>
<?php
}
?>
</body>
</html>

While doing data insert, it's best practice to use function get_magic_quotes_gpc() to check if current configuration for magic quote is set or not. If this function returns false, then use function addslashes() to add slashes before quotes.
You can put many validations around to check if entered data is correct or not and can take appropriate action.

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Java Tutorials by Experts

Friday, October 31, 2014