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alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);
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alter table infos add ex tinyint not null default '0';
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alter table t2 drop column c;
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driverClassName=com.mysql.jdbc.Driver
username=root
password=
url=jdbc:mysql://localhost:3306/work
poolSize=10
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