在数据库执行sql查询时，需要在where部分限制执行范围为某字段为数字字符串形式。在使用LIKE语句时遇到了困难。LIKE只支持%和_两种通配符（前者为不限长度的字符串，后者为单个字符）。
其解决方案是使用~函数符号，这是支持正则形式的like功能代替。
因此解决方案就是：
select * from my_table where my_field ~ '^[0-9]+?$'这样其含义就是查找所有纯数字形式的字符串。
postgresql中字符串的数字形式查询
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