sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql

【sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql】的更多相关文章

sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql

映射数据库时报错:sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql 错误代码: username = db.Column(db.String) String需要指定长度,如: username = db.Column(db.String(50))…

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) Cannot add a NOT NULL column with default value NULL [SQL: u'ALTER TABLE address_scopes ADD COLUMN ip_version INTEGER NOT NULL']

root@hett-virtual-machine:~# su -s /bin/sh -c "neutron-db-manage --config-file /etc/neutron/neutron.conf \ --config-file /etc/neutron/plugins/ml2/ml2_conf.ini upgrade head" neutronNo handlers could be found for logger "oslo_config.cfg"…

sqlalchemy.exc.InternalError: (pymysql.err.InternalError) (1091, "Can't DROP 'users_ibfk_1'; check that column/key exists") [SQL: ALTER TABLE users DROP FOREIGN KEY users_ibfk_1]

flask 迁移数据库报错报错: sqlalchemy.exc.InternalError: (pymysql.err.InternalError) (1091, "Can't DROP 'users_ibfk_1'; check that column/key exists")[SQL: ALTER TABLE users DROP FOREIGN KEY users_ibfk_1] 解决办法: 将每个数据库表类型InnoDB转为 MyISAM 如果报错ERROR 1217 (23…

sqlalchemy.exc.InternalError: (pymysql.err.InternalError) (1366, "Incorrect string value: '\\xE6\\xB1\\x89\\xE8\\xAF\\xAD...' for column 'className' at row 1") [SQL: INSERT INTO classmessage (`classId

sqlalchemy.exc.InternalError: (pymysql.err.InternalError) (1366, "Incorrect string value: '\\xE6\\xB1\\x89\\xE8\\xAF\\xAD...' for column 'className' at row 1")[SQL: INSERT INTO classmessage (`classId`, `className`, xq, `useOrNot`, `increaseTime`…

出错信息：Incorrect string value: '\xE4\xBD\xA0\xE5\xA5\xBD' for column 'username'

出错信息: java.sql.SQLException: Incorrect string value: '\xE4\xBD\xA0\xE5\xA5\xBD' for column 'username' at row 1 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956) at com.m…