@Target(value=FIELD) @Retention(value=RUNTIME) @Documented public @interface Index
public abstract String value
如果设置了名字例如union_name,系统会默认在名字前加actable_idx_前缀,也就是actable_idx_union_name
public abstract String[] columns
可设置多个建立联合索引{"login_mobile","login_name"}
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