ResultSetが閉じ

Question

がでSQL挿入（Javaの/ Netbeansの）

Connection var2 = DBConnPool.getInstance().getConnection(); 
Statement var3 = null; 
String var5; 
ResultSet var8 = null; 

try { 
    var3 = var2.createStatement(); 

    var5 = "insert into triggers (ts, nodeip, trapname) values (now(), '"+ipaddress+"', '"+trapname+"')"; 
    var3.execute(var5); 

    var5 = "select asset.id as assetid, node.id as nodeid \n" + 
     "from asset, node\n" + 
     "where asset.name LIKE 'Trigger%'\n" + 
     "and node.ipaddress=\'"+ipaddress+"'"; 
    var8 = var3.executeQuery(var5); 

    while(var8.next()){ 
     int var31 = var8.getInt("assetid"); 
     int var32 = var8.getInt("nodeid"); 

     var5 = "insert into alerts (ts, assetid, alerttypeid, nodeid, ack) values (now(), " + var31 + ", 15, " + var32 + ", 0)"; 
     var3.execute(var5); 
     var5 ="insert into logs (ts, rssi, nodeid, assetid) values (now(), 1000, " + var32 + ", " + var31 + ")"; 
     var3.execute(var5); 
    } 
} 

選択asset.id照会がOKで実行しているように見える前に、閉じたResultSetの問題を持っていますが、（挿入する前に） point of

while(var8.next()) { 
    int var31 = var8.getInt("assetid"); 
    int var32 = var8.getInt("nodeid"); 

ResultSetが終了した後で操作を実行できません。

while（var8.next（））の外に挿入を行う必要がありますか？もしそうならば、変数var31とvar32をどのように回復/参照するのですか？

謝罪、私はVAR名は非常に有用ではありませんが、挿入コマンドは簡単でなければなりません（またはそう思った）知っている

思考を分離するようにしてください

よろしく アクティブ

Answer 1

を高く評価すべての声明の責任：

Connection var2 = DBConnPool.getInstance().getConnection(); 
Statement var3 = null; 
Statement stmQuery = null; 
String var5; 
ResultSet var8 = null; 

try { 
    var3 = var2.createStatement(); 
    stmQuery = var2.createStatement(); 

    var5 = "insert into triggers (ts, nodeip, trapname) values (now(), '"+ipaddress+"', '"+trapname+"')"; 
    var3.execute(var5); 

    var5 = "select asset.id as assetid, node.id as nodeid \n" + 
     "from asset, node\n" + 
     "where asset.name LIKE 'Trigger%'\n" + 
     "and node.ipaddress=\'"+ipaddress+"'"; 
    var8 = stmQuery.executeQuery(var5); 

    while(var8.next()){ 
     int var31 = var8.getInt("assetid"); 
     int var32 = var8.getInt("nodeid"); 

     var5 = "insert into alerts (ts, assetid, alerttypeid, nodeid, ack) values (now(), " + var31 + ", 15, " + var32 + ", 0)"; 
     var3.execute(var5); 
     var5 ="insert into logs (ts, rssi, nodeid, assetid) values (now(), 1000, " + var32 + ", " + var31 + ")"; 
     var3.execute(var5); 
    } 
} catch (Exception e) { 
    //Somthing went wrong! 
} finally { 
    var3.close(); 
    stmQuery.close(); 
    var8.close(); 
    var2.close(); 
} 

ヒント：ご覧のとおり、最終ブロック内のリソースを閉じることは非常に重要です。

これは役に立ちます。