第 1 种：在 Java 代码中添加 sql 通配符。

string wildcardname = “%smi%”;
list<name> names = mapper.selectlike(wildcardname);
<select id=”selectlike”>
select * from foo where bar like #{value}
</select>

第 2 种：在 sql 语句中拼接通配符，会引起 sql 注入

string wildcardname = “smi”;
list<name> names = mapper.selectlike(wildcardname);
<select id=”selectlike”>
select * from foo where bar like "%"#{value}"%"
</select>