方法一：

string sql = “SELECT a.serv_name,a.acct_id,b.detail,c.customer_name”;
sql += " FROM serv a,address b,acct c";
sql += " WHERE a.acc_nbr = :acc_nbr";
sql += " AND a.state <> ‘F0X’";
sql += " AND b.address_id = a.address_id";
sql += " AND c.acct_id = a.acct_id";
sql += " AND c.acct_seq_nbr = c.acct_seq_nbr";

方法二：

在字符串前面加上@,然后在字符串中间就可以随意用回车换行了。