创建数据库 CREATE DATABASE [ IF NOT EXISTS ] newschool; --【如果不存在就】创建一个newschool的数据库 1. 删除数据库 DROP DATABASE [ IF EXISTS ] newschool;--【如果存在就】删除一个newschool的数据库 1. 使用数据库 USE school; --使用数据库 school 1
CREATE TABLE [IF NOT EXISTS] `表名`( '字段名' 列类型 [属性] [索引] [注释], '字段名' 列类型 [属性] [索引] [注释], ... '字段名' 列类型 [属性] [索引] [注释] ) 1. 2. 3. 4. 5. 索引和注释可选择性加入 CREATE TABLE bank( b_id CHAR(5) PRIMARY KEY , b_name VARCHAR(30...
我想在 SQLAlchemy 中执行“CREATE SCHEMA IF NOT EXISTS”查询。有没有比这更好的方法: engine = sqlalchemy.create_engine(connstr) schema_name = config.get_config_value('db', 'schema_name') #Create schema; if it already exists, skip this try: engine.execute(CreateSchema(schema_name)) except...
pool_recycle=60, pool_pre_ping=True)#判断数据库是否存在,不存在则创建ifnotdatabase_exists(engine.url): create_database(engine.url)#如果不增加此判断逻辑,数据库不存在,创建表时会以下报错sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (1049,"Unknown database 'online_test'") 所有人...
from sqlalchemy import create_engine #1 准备 # 需要事先安装好pymysql # 需要事先创建好数据库:create database db1 charset utf8; #2 创建引擎 egine=create_engine('mysql+pymysql://root@127.0.0.1/db1?charset=utf8') #3 执行sql # egine.execute('create table if not EXISTS t1(id int PRIMA...
CREATE TABLE IF NOT EXISTS `job` ( `id` INT NOT NULL AUTO_INCREMENT, `job_status` INT NOT NULL, `job_name` VARCHAR(255), PRIMARY KEY (`id`) )ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; 数据操作 SQLAlchemy对数据库的操作都是通过Session进行的,Session的创建在 创建连接&&Session 部分,Session的...
Support if_exists and if_not_exists on create/drop table commands https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/5455 sqlalchemy-botclosed this as completedin 8fae3e1on Sep 14, 2024 lachaibadded a commit that references this issue on Sep 14, 2024 Support if_exists and if_not_ex...
from sqlalchemy import create_engine #1 准备 # 需要事先安装好pymysql # 需要事先创建好数据库:create database db1 charset utf8; #2 创建引擎 egine=create_engine('mysql+pymysql://root@127.0.0.1/db1?charset=utf8') #3 执行sql # egine.execute('create table if not EXISTS t1(id int PRIMA...
from sqlalchemy import func from models.models import MyTable # 自定义的数据库表Model类 def is_id_card_exists(id_card): try: # 注意这里一定要用scope_session,否则会由数据缓存,从而结果不准确 s = db.create_scoped_session() result = s.query(MyTable).filter(func.upper(MyTable.id_card) =...
Added support for :paramref:`.Operations.create_table.if_not_exists` and :paramref:`.Operations.drop_table.if_exists`, adding similar functionality to render IF [NOT] EXISTS for table operations in a similar way as with indexes. Pull request courtesy Aaron Griffin. Fixes: #1520 Closes: #1521...