Post on 05-Jan-2016
description
PHP : Working with Resultsets
Last class
Open a connection to the MySQL server.Specify the databaseIssue queries (no updates at this stage)Display the results in the table form.Flush memoryClose the connection.
Today’s class
Learn to create database, tables, attributes using mySQL
Embed PHP “type” code with HTML “type” code
Help and kick start your project in your SAD class
Help and kick start your project in this classGood Luck coz you need LOTS OF IT!
Create Table
If you need help on data type definition http://dev.mysql.com/doc/refman/5.0/en/data-types.html
Obtaining the number of columns/attributesIn MySQL you would do the following:
$query = "SELECT * FROM employee";$result = mysql_query($query); // need this to get
resultSETif (mysql_error()) {
die("cannot processed select query");}$num = mysql_num_rows($result); // obtain the number of
rows/rec$numFields = mysql_num_fields($result); //obtain the number
of cols
To obtain the column/attribute names$name = mysql_field_name($result, $i); where $i is the column
number .. going from 0 to ($numFields – 1)
Obtaining the number of columns/attributesObtaining the length of an attribute
$attrLen = mysql_field_len($result, $i); where $i is the column number .. going from 0 to ($numFields – 1)
Obtaining the attribute type$attrType = mysql_field_type($result, $i); where $i is the
column number .. going from 0 to ($numFields – 1)
More function
Obtain the tables within the database$tables = mysql_list_tables("test_alum");
$numTables = mysql_num_rows($tables);
$tableName = mysql_tablename($tables, $k); will give you the table names where $k goes from 0 to ($numTables – 1)
More function – field names
$fields = mysql_list_fields("test_alum", $tableName); // field result
$numfields = mysql_num_fields($fields); //get the number of fields
// Do a for loop here to get the attribute name for index 0 to ($numfields – 1)
for (…. ){
$fieldInfo = mysql_fetch_field($fields);echo $fieldInfo->name;
}
Note: The mysql_fetch_field() command will get you the NEXT attribute property.
Other characteristics
echo $fieldInfo->blob;
echo $fieldInfo->max_length;
echo $fieldInfo->not_null;
echo $fieldInfo->numeric;
echo $fieldInfo->primary_key;
echo $fieldInfo->table;
echo $fieldInfo->type;
echo $fieldInfo->unique_key;
echo $fieldInfo->unsigned;
echo $fieldInfo->zerofill;
echo $fieldInfo->multiple_key;
Exercises jex7.php, jex8.php combine with HTML coding. Use skeleton codejex7.php: You are to show all the tables and
for the test_alum databasejex8.php: You are to show the attributes for
the “users” table. In particular, you have to show the name of attribute; the type of attribute; whether it is numeric (show T is it is numeric
and F if it is not)
Skeleton code
<HTML><HEAD> <TITLE>PHP CODE with HTML commands</TITLE>
</HEAD>
<BODY> <IMG src="mu.gif"> <BR> <BR> <?php
//insert your PHP code inside here ?>
</BODY></HTML>