私はこのJavaコードを持っています:
ArrayList<MessageMap> ids = getNewMail(UserID, type, maxIdMessage);
Message[] message = new Message[ids.size()];
if(ids.size()>0){
ResultSet rs;
int j =0;
for(MappaMessaggi i : ids){
pstmt = conn.prepareStatement("SELECT * FROM Messaggi WHERE MessageID = ?");
pstmt.setInt(1, i.getMessageID());
rs = pstmt.executeQuery();
rs.next();
.
.
.
}
どこにgetNewMail
ある:
public synchronized ArrayList<MessageMap> getNewMail(int UserID,int type,int max){
ArrayList<MessageMap> map = new ArrayList<MessageMap>();
try {
pstmt = conn.prepareStatement("SELECT * FROM MessageMap WHERE UserID = ? AND TipoID = ? AND MessageID > ?");
.
.//fill arraylist with resultSet
.
}
たった1つのクエリで同じことができることは知っていますが、方法がわかりません..誰かが私の目を開けてくれますか? :) ありがとう!!!
編集:私は試します:
SELECT i.*
FROM Messaggi AS i
INNER JOIN MessageMap AS p i.MessageID = p.MessageID
WHERE p.MessageID = 1 AND p.UserID = 1 AND p.TipoID = 2
しかし、私は取得します:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'i.MessageID = p.MessageID WHERE p.MessageID = 1 AND p.UserID = 1 AND p.TipoID = ' at line 3