一、
sql = "select * from tb_user where user_name like '%'||?'%'";
pstmt.setString(1, userPartName);
二、
sql = "select * from tb_user where user_name like ?";
pstmt.setString(1, "%" + userPartName + "%");
三、
sql = "select * from tb_user where user_name like '%"+userPartName+"%'";
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