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PHP simple connection operation to mysql database

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Dec 05, 2016 pm 01:26 PM

After I finished working on the company’s front-end static pages a while ago, I briefly learned the basics of PHP. Today I thought about reviewing the way PHP connects to the database, and write an essay and save it for later

php connect database port and create new database

<?<span style="color: #000000">php
        </span><span style="color: #800080">$servername</span> = "localhost"<span style="color: #000000">;
        </span><span style="color: #800080">$username</span> = "root"<span style="color: #000000">;
        </span><span style="color: #008000">//</span><span style="color: #008000"> 創(chuàng)建連接</span>
        <span style="color: #800080">$conn</span> = <span style="color: #008080">mysqli_connect</span>(<span style="color: #800080">$servername</span>, <span style="color: #800080">$username</span><span style="color: #000000">);
        </span><span style="color: #008000">//</span><span style="color: #008000"> 檢測(cè)連接</span>
        <span style="color: #0000ff">if</span> (!<span style="color: #800080">$conn</span><span style="color: #000000">) {

            </span><span style="color: #0000ff">die</span>("連接失敗: " . <span style="color: #008080">mysqli_connect_error</span><span style="color: #000000">());
        }

        </span><span style="color: #008000">//</span><span style="color: #008000"> 創(chuàng)建數(shù)據(jù)庫(kù)</span>
        <span style="color: #800080">$sql</span> = "CREATE DATABASE myDB"<span style="color: #000000">;
        </span><span style="color: #0000ff">if</span> (<span style="color: #008080">mysqli_query</span>(<span style="color: #800080">$conn</span>, <span style="color: #800080">$sql</span><span style="color: #000000">)) {
            </span><span style="color: #0000ff">echo</span> "數(shù)據(jù)庫(kù)創(chuàng)建成功"<span style="color: #000000">;
        } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
            </span><span style="color: #008000">//</span><span style="color: #008000">數(shù)據(jù)庫(kù)已經(jīng)存在</span>
            <span style="color: #0000ff">echo</span> "Error creating database: " . <span style="color: #008080">mysqli_error</span>(<span style="color: #800080">$conn</span><span style="color: #000000">);
        }

        </span><span style="color: #008080">mysqli_close</span>(<span style="color: #800080">$conn</span><span style="color: #000000">);
        </span>?>

After the connection is successful, create a simple data table

<span style="color: #008000">//</span><span style="color: #008000"> 使用 sql 創(chuàng)建數(shù)據(jù)表</span>
        <span style="color: #800080">$sql</span> = "<span style="color: #000000">CREATE TABLE MyGuests (
        id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
        firstname VARCHAR(30) NOT NULL,
        lastname VARCHAR(30) NOT NULL,
        email VARCHAR(50),
        reg_date TIMESTAMP
        )</span>"<span style="color: #000000">;

        </span><span style="color: #0000ff">if</span> (<span style="color: #800080">$conn</span>->query(<span style="color: #800080">$sql</span>) === <span style="color: #0000ff">TRUE</span><span style="color: #000000">) {
            </span><span style="color: #0000ff">echo</span> "Table MyGuests created successfully"<span style="color: #000000">;
        } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
            </span><span style="color: #0000ff">echo</span> "創(chuàng)建數(shù)據(jù)表錯(cuò)誤: " . <span style="color: #800080">$conn</span>-><span style="color: #000000">error;
        }</span>

When connecting to the database, make sure the server port of the database is open, otherwise you cannot connect. Before writing the code, you can use navicat to test the connection to the database

When learning, open the database service, which can be done through the integrated environment of wamp

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