我有一张桌子
CREATE TABLE `category` (
`category_id` int(11) ,
`T1` varchar(50) DEFAULT NULL,
`T2` varchar(50) DEFAULT NULL,
`T3` varchar(50) DEFAULT NULL,
`T4` varchar(50) DEFAULT NULL,
`T5` varchar(50) DEFAULT NULL
)
mysql> select * from category;
+-------------+----------+-------------+---------------+------+------+
| category_id | T1 | T2 | T3 | T4 | T5 |
+-------------+----------+-------------+---------------+------+------+
| 145 | Pop Corn | Regular Tub | Plain Salted | NULL | NULL |
| 150 | Pop Corn | Buckets | Plain Salted | NULL | NULL |
| 151 | Pop Corn | Jumbo | Plain Salted | NULL | NULL |
| 152 | Pop Corn | Regular Tub | Butter Scotch | NULL | NULL |
| 153 | Pop Corn | Regular Tub | Tomoto Tango | NULL | NULL |
| 154 | Pop Corn | Buckets | Butter Scotch | NULL | NULL |
| 222 | Pop Corn | NULL | NULL | NULL | NULL |
| +-------------+----------+-------------+---------------+------+-----
我的逻辑
String reqstr="Pop Corn@Small@Test";
String values[] = reqstr.split("@");
else if(values.length==3)
{
sqlselect = "select category_id from category where T1 = ? AND T2 IS NULL AND T3 IS NULL AND T4 IS NULL" ;
selectpst = dbConnection.prepareStatement(sqlselect);
selectpst.setString(1, values[0]);
resultset = selectpst.executeQuery();
if(resultset.next())
{
sql = "update category set T3 = '"+values[2]+"' T2 = '"+values[1]+"' where T1 ='"+values[0]+"'
updateStatement.executeUpdate(sql);
// similarly check for T2 , T3 , T4 also
}
else
{
// Insert logic here
}
}
可以修改这个逻辑以提高效率吗？
我面临的问题是，例如在这种情况下，Pop Corn已经存在，它应该更新那个，否则它应该插入新的
同样，如果Pop Corn Small存在，它应该更新那个或者插入新记录