[英]mysql error syntax in python
sql = """
DROP PROCEDURE
IF EXISTS schema_change;
delimiter ';;'
CREATE PROCEDURE schema_change() BEGIN
if exists (select * from information_schema.columns where table_schema =
schema() and table_name = 'selectedairport' and column_name = 'GDP')
then
alter table selectedairport drop column GDP;
alter table selectedairport add column GDP DOUBLE;
end;;
delimiter ';'
CALL schema_change () ; DROP PROCEDURE
IF EXISTS schema_change ;
"""
cursor6.execute(sql)
However, this produces the error: 但是,这会产生错误:
pymysql.err.ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'delimiter ';;'\\nCREATE PROCEDURE schema_change() BEGIN\\n\\n if exists (select * f' at line 1") pymysql.err.ProgrammingError:(1064,“您的SQL语法有错误;请查看与您的MySQL服务器版本相对应的手册,以在'delimiter'附近使用正确的语法;;'\\ n创建过程schema_change()开始n \\ n如果存在(在第1行选择* f')
What could be the problem? 可能是什么问题呢?
The execute()
method (usually) only executes a single command at a time, so the script cannot be parsed, and anyway there is no support for DELIMITER
; execute()
方法(通常)一次只执行一个命令,因此无法解析脚本,并且无论如何不支持DELIMITER
; see this comment on GitHub . 在GitHub上查看此评论 。 Therefore, one solution is to have multiple calls: 因此,一种解决方案是进行多个调用:
cursor6.execute("""
DROP PROCEDURE
IF EXISTS schema_change
""")
cursor6.execute("""
CREATE PROCEDURE schema_change() BEGIN
if exists (select * from information_schema.columns where table_schema =
schema() and table_name = 'selectedairport' and column_name = 'GDP')
then
alter table selectedairport drop column GDP;
NOTE : There is a syntax error here, we need to further add: 注意 :此处存在语法错误,我们需要进一步添加:
END IF;
Now continue as before: 现在像以前一样继续:
alter table selectedairport add column GDP DOUBLE;
end
""")
cursor6.execute("""
CALL schema_change ()
""")
# Or cursor6.callproc('schema_change')
cursor6.execute("""
DROP PROCEDURE
IF EXISTS schema_change
""")
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