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MySQL Relational Database

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Mar 16.2008

Hi,

Using PHP & MySQL, how does one create a relational database?

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PHP

5 Comments(s) ↴

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@DysanauthorMar 16.2008 — How do I convert the following database into a relational database? The database contains peoples favorite food and drinks.

[CODE]if (mysql_query("CREATE DATABASE db",$con))
{
echo "Database Created!";
}
else
{
echo mysql_error();
}

mysql_select_db("db", $con);
$sql = "CREATE TABLE persons
(
name text,
)";

mysql_query($sql,$con);

$sql = "CREATE TABLE items
(
favouritedrink text,
favouritefood text,

)";

mysql_query($sql,$con);
mysql_close($con);
[/CODE]
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@scragarMar 16.2008 — you need a field joining the two, so either a unique ID or some such:

[code=php]mysql_query(
"CREATE TABLE persons(
ID INT NOT NULL AUTO_INCREMENT,
name VARCHAR(64),
PRIMARY KEY (ID)
)"
);
mysql_query(
"CREATE TABLE items(
person INT,
favouritedrink text,
favouritefood text,
FOREIGN KEY (person) REFERENCES persons(ID) on delete cascade
)"
);[/code]
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@DysanauthorMar 16.2008 — How do I retrieve each user from the database, along with their favorite food and drink?
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@scragarMar 16.2008 — [code=php]$rs = mysql_query("SELECT * FROM persons
LEFT JOIN(items)
ON (persons.ID=items.person)");
while($row = mysql_fetch_assoc($rs)){
echo '<p>';
var_dump($row);
echo '</p>';
};[/code]
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