django 链接多个数据库 并使用原生sql

settings文件如下：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        "HOST": '127.0.0.1',
        "PORT": 3306,
        "USER": 'root',
        'PASSWORD': "123456",
        'NAME': 'analysis',
    },
    'analysis1': {
        'ENGINE': 'django.db.backends.mysql',
        "HOST": '127.0.0.1',
        "PORT": 3306,
        "USER": 'root',
        'PASSWORD': "123456",
        'NAME': 'analysis1',
    }
}

查找Django的文档：

使用默认 default 数据库，

from django.db import connection
 
def my_custom_sql(self):
    with connection.cursor() as cursor:
        cursor.execute("UPDATE bar SET foo = 1 WHERE baz = %s", [self.baz])
        cursor.execute("SELECT foo FROM bar WHERE baz = %s", [self.baz])
        row = cursor.fetchone()
 
    return row

如果有多个数据库，会默认使用 default，当你想使用指定的数据库连接时，引入的对象就变成了connections

from django.db import connections
def qwq():

    with connections['analysis1'].cursor() as cursor:

        # 查看所有表
        cursor.execute("show tables")
        # cursor.execute("SELECT foo FROM bar WHERE baz = %s", [self.baz])
        row = cursor.fetchall()
          # 查询有多少数据   默认为第一张表
        cursor.execute("select count(1) as c from %s" % t_name)  # 查询有多少条数据
        count_t = cursor.fetchone()
        print(count_t)
                # 查询表字段名及注释 默认为第一张表
        sql_t_name = "select column_name,column_comment from INFORMATION_SCHEMA.Columns where table_name='{}'".format(
            t_name)
        cursor.execute(sql_t_name)  # 查询有多少条数据
        tables_data = cursor.fetchall()

————————————————

原文链接：https://blog.csdn.net/qq_37049050/article/details/85131514

标签：原生,execute,name,db,baz,django,cursor,sql
来源： https://blog.csdn.net/yutu75/article/details/119410459