Alembic迁移在Windows Server中的mssql中显示错误我该如何解决？

问题描述

我试图从迁移中的列中提取json对象。我收到此错误

__main__ ERROR (pyodbc.ProgrammingError) ('42000',"[42000] [Microsoft][ODBC sql Server Driver][sql Server]Incorrect Syntax near '>'

这是我的代码。我该如何解决？

def upgrade():
    op.execute("CREATE VIEW MESSAGE_VIEW AS SELECT "
               "event_messages.message_id,"
               "event_messages.event_id,"
               "event_messages.message,"
               "event_messages.message::json->'message' AS message_input "
               "FROM event_messages "
               "LEFT JOIN chatbot_events ON event_messages.event_id = chatbot_events.event_id;")

解决方法

您的代码不正确。

您不能在MSSQL中运行此命令。因为您的命令特定于PostgreSQL。

event_messages.message :: json->'message'AS message_input 是PostgreSQL中的JSON数据类型，MSSQL不支持。

正确的MSSQL语句是：

def upgrade():
    op.execute("CREATE VIEW MESSAGE_VIEW AS SELECT "
               "event_messages.message_id,"
               "event_messages.event_id,"
               "event_messages.message,"
               "event_messages.message AS message_input "
               "FROM event_messages "
               "LEFT JOIN chatbot_events ON event_messages.event_id = chatbot_events.event_id;")

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