php操作mysql数据库增删改查

在php.ini里打开这个扩展

<?php
  $database_name = "users";
  $databbase_user = "root";
  $database_password = "user123";
  $data_host = "localhost";

  // 创建连接
  $conn = new mysqli($data_host, $databbase_user, $database_password, $database_name);
  if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
  }
  // 链接成功
  echo "连接成功<br>";

  // 查询操作
  $select_sql = "SELECT * FROM users";
  $select_result = $conn->query($select_sql);
  if ($select_result->num_rows > 0) {
    while ($row = $select_result->fetch_assoc()) {
      echo "id: " . $row["id"] . " - name: " . $row["name"] . " - age: " . $row['age'] . "<br>";
    }
  } else {
    echo "没有找到记录<br>";
  }

  // 添加操作
  $insert_sql = "INSERT INTO users (name, age) VALUES ('zhangsan', 12)";
  if ($conn->query($insert_sql) === TRUE) {
    echo "添加成功<br>";
  } else {
    echo "添加失败: " . $conn->error . "<br>";
  }

  // 批量插入操作
  $batch_insert_sql = "INSERT INTO users (name, age) VALUES 
  ('lisi', 22), 
  ('wangwu', 25), 
  ('zhaoliu', 28)";
  
  if ($conn->query($batch_insert_sql) === TRUE) {
    echo "批量插入成功<br>";
  } else {
    echo "批量插入失败: " . $conn->error . "<br>";
  }

  // 修改操作
  $update_sql = "UPDATE users SET name='zhangsan' WHERE id=1";
  if ($conn->query($update_sql) === TRUE) {
    echo "修改成功<br>";
  } else {
    echo "修改失败: " . $conn->error . "<br>";
  }

  // 删除操作
  $delete_sql = "DELETE FROM users WHERE id=1";
  if ($conn->query($delete_sql) === TRUE) {
    echo "删除成功<br>";
  } else {
    echo "删除失败: " . $conn->error . "<br>";
  }

  // 关闭连接
  $conn->close();
?>

<?php

$database_name = "users";

$databbase_user = "root";

$database_password = "user123";

$data_host = "localhost";

// 创建连接

conn = new mysqli(data_host, databbase_user, database_password, $database_name);

if ($conn->connect_error) {

die("连接失败: " . $conn->connect_error);

}

// 链接成功

echo "连接成功<br>";

// 查询操作

$select_sql = "SELECT * FROM users";

select_result = conn->query($select_sql);

if ($select_result->num_rows > 0) {

while (row = select_result->fetch_assoc()) {

echo "id: " . row\["id"\] . " - name: " . row"name" . " - age: " . $row'age' . "<br>";

}

} else {

echo "没有找到记录<br>";

}

// 添加操作

$insert_sql = "INSERT INTO users (name, age) VALUES ('zhangsan', 12)";

if (conn-\>query(insert_sql) === TRUE) {

echo "添加成功<br>";

} else {

echo "添加失败: " . $conn->error . "<br>";

}

// 批量插入操作

$batch_insert_sql = "INSERT INTO users (name, age) VALUES

('lisi', 22),

('wangwu', 25),

('zhaoliu', 28)";

if (conn-\>query(batch_insert_sql) === TRUE) {

echo "批量插入成功<br>";

} else {

echo "批量插入失败: " . $conn->error . "<br>";

}

// 修改操作

$update_sql = "UPDATE users SET name='zhangsan' WHERE id=1";

if (conn-\>query(update_sql) === TRUE) {

echo "修改成功<br>";

} else {

echo "修改失败: " . $conn->error . "<br>";

}

// 删除操作

$delete_sql = "DELETE FROM users WHERE id=1";

if (conn-\>query(delete_sql) === TRUE) {

echo "删除成功<br>";

} else {

echo "删除失败: " . $conn->error . "<br>";

}

// 关闭连接

$conn->close();

?>