bind(C, name='add_numbers'什么意思
时间: 2023-12-17 14:03:03 浏览: 28
在Fortran语言中,可以使用`bind(C)`语句来告诉编译器将某个子程序或函数按照C语言的约定进行编译。这样做可以使得Fortran代码与C语言代码进行互操作。在这种情况下,Fortran代码中的符号名会被编译器修改为C语言中的符号名,以便与C语言代码进行链接。
`name='add_numbers'`是`bind(C)`的一个可选参数,用于指定在C语言中该函数的符号名。如果不指定该参数,则默认使用Fortran中的符号名作为C语言中的符号名。例如,在以下示例中:
```
subroutine my_subroutine(arg1, arg2) bind(C, name='my_c_subroutine')
! subroutine body
end subroutine my_subroutine
```
`bind(C, name='my_c_subroutine')`告诉编译器将该子程序按照C语言的约定进行编译,并将其符号名设置为`my_c_subroutine`。这样,在C语言代码中就可以使用`my_c_subroutine`符号名来调用该子程序。
相关问题
class OperationLog(db.Model): """操作日志表""" __bind_key__ = 'db2' __tablename__ = 'operation_log' id = mapped_column(Integer, primary_key=True) userid = mapped_column(String(16)) username = mapped_column(String(32), index=True) endpoint = mapped_column(String(128)) methods = mapped_column(String(16)) full_path = mapped_column(String(256)) c_date = mapped_column(DateTime) @staticmethod def add_operation_log(userid: str, username: str): """新增操作日志""" c_date = datetime.now() operation_log = OperationLog() operation_log.userid = userid operation_log.username = username operation_log.endpoint = request.endpoint operation_log.methods = request.method operation_log.full_path = request.full_path operation_log.c_date = c_date db.session.add(operation_log) db.session.execute( update(User).where(User.userid == userid).values(lastlogin=c_date)) db.session.commit() return True 帮我优化并建议这段代码
以下是对代码的优化和建议:
1. 使用类方法代替静态方法
在这种情况下,我们可以使用类方法代替静态方法。这样,我们可以从类本身传递参数而不是从实例传递参数,并且可以轻松地访问类属性。
2. 使用参数注释
为了更好地理解代码,我们建议使用参数注释,以便将参数名称,类型和说明文档化。
3. 使用类型提示
在函数参数和返回值中使用类型提示可以提高代码的可读性和可维护性,并帮助 IDE 提供更好的代码补全和错误检查。
4. 使用 try-finally 块
使用 try-finally 块可以确保无论是否出现异常,都会关闭数据库会话。
5. 使用 with 语句
使用 with 语句可以确保数据库会话在使用后被关闭,而无需显式调用 commit 或 rollback 方法。
以下是优化后的代码:
```
class OperationLog(db.Model):
"""操作日志表"""
__bind_key__ = 'db2'
__tablename__ = 'operation_log'
id = mapped_column(Integer, primary_key=True)
userid = mapped_column(String(16))
username = mapped_column(String(32), index=True)
endpoint = mapped_column(String(128))
methods = mapped_column(String(16))
full_path = mapped_column(String(256))
c_date = mapped_column(DateTime)
@classmethod
def add_operation_log(cls, userid: str, username: str) -> bool:
"""新增操作日志"""
c_date = datetime.now()
operation_log = cls()
operation_log.userid = userid
operation_log.username = username
operation_log.endpoint = request.endpoint
operation_log.methods = request.method
operation_log.full_path = request.full_path
operation_log.c_date = c_date
with db.session.begin():
db.session.add(operation_log)
db.session.execute(
update(User).where(User.userid == userid).values(lastlogin=c_date))
return True
```
dmin_personnel id,int,password,varchar,name,varchar,role,varchar,department,varchar,sex,varchar,email,varchar,telephon,varchar添加admin_personnel表数据,下面代码错误在哪 <?php // 连接数据库 include "conn.php"; // 获取请求参数 $id = $_POST['id']; $name = $_POST['name']; $password = $_POST['password']; $sex = $_POST['sex']; $role = $_POST['role']; $department = $_POST['department']; $email = $_POST['email']; $telephone = $_POST['telephone']; // 创建预处理语句 $stmt = mysqli_prepare($conn, "INSERT INTO admin_personnel (id, name, password, sex, role, department,email,telephone) VALUES (?, ?, ?, ?, ?, ?, ?, ?)"); mysqli_stmt_bind_param($stmt, "isssssss", $id, $name, $password, $sex, $role, $department, $email, $telephone); // 执行预处理语句 if (mysqli_stmt_execute($stmt)) { // 获取插入数据的ID $insert_id = mysqli_insert_id($conn); // 查询插入的数据 $result = mysqli_query($conn, "SELECT * FROM admin_personnel WHERE id=\"$insert_id\""); $row = mysqli_fetch_assoc($result); // 返回响应数据 $response = array( "data" => $row, "meta" => array( "msg" => "用户创建成功", "status" => 201 ) ); echo json_encode($response); } else { // 返回错误信息 $response = array( "meta" => array( "msg" => "用户创建失败", "status" => 500 ) ); echo json_encode($response); } // 关闭连接 mysqli_stmt_close($stmt); mysqli_close($conn); ?>
代码中存在以下错误:
1. admin_personnel 表中的字段名和数据类型没有对应上。
2. $telephone 变量名拼写错误,应该为 $telephon。
修改后的代码如下:
```php
<?php
// 连接数据库
include "conn.php";
// 获取请求参数
$id = $_POST['id'];
$name = $_POST['name'];
$password = $_POST['password'];
$sex = $_POST['sex'];
$role = $_POST['role'];
$department = $_POST['department'];
$email = $_POST['email'];
$telephone = $_POST['telephone'];
// 创建预处理语句
$stmt = mysqli_prepare($conn, "INSERT INTO admin_personnel (id, password, name, role, department, sex, email, telephon) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
mysqli_stmt_bind_param($stmt, "isssssss", $id, $password, $name, $role, $department, $sex, $email, $telephone);
// 执行预处理语句
if (mysqli_stmt_execute($stmt)) {
// 获取插入数据的ID
$insert_id = mysqli_insert_id($conn);
// 查询插入的数据
$result = mysqli_query($conn, "SELECT * FROM admin_personnel WHERE id=\"$insert_id\"");
$row = mysqli_fetch_assoc($result);
// 返回响应数据
$response = array(
"data" => $row,
"meta" => array(
"msg" => "用户创建成功",
"status" => 201
)
);
echo json_encode($response);
} else {
// 返回错误信息
$response = array(
"meta" => array(
"msg" => "用户创建失败",
"status" => 500
)
);
echo json_encode($response);
}
// 关闭连接
mysqli_stmt_close($stmt);
mysqli_close($conn);
?>
```