質問編集履歴
2
追記
test
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File without changes
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test
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@@ -325,3 +325,129 @@
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環境の問題でしょうか？
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追記––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
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333
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返答が遅くなり申し訳ありません。
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336
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337
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ShowDBクラスを書いていませんでした。
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winPCではDB_ConnectionのPASSが違うものの、
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340
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コンソールログにDB名一覧が表示されます。
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342
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```Java
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package db_test;
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import java.util.ArrayList;
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public class ShowDB extends DB_Connection {
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private ArrayList<String> sDBName = new ArrayList<>(); // DB名格納用
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private boolean bExceptionFlog = true;// 戻り値用のエラー判別のboolean変数
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public boolean showDB() {
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String sSQL = "show databases"; // SQL文の変数
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String sDBName;// DB名格納用
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this.sDBName.clear();
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dbConnect(); // ※このクラス実行前に接続している場合は不要
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/* SQL文の実行 */
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try {
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rs = stmt.executeQuery(sSQL);
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} catch (Exception sql_e) {
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bExceptionFlog = false;
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sql_e.printStackTrace();
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}
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/* rsに受け取った値を戻り値用のalDBNameに格納 */
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try {
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rs = stmt.executeQuery(sSQL);
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while (rs.next()) {
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sDBName = rs.getString("Database");
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this.sDBName.add(sDBName);
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}
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} catch (Exception sql_e) {
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bExceptionFlog = false;
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sql_e.printStackTrace();
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}
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/* SQL文をクリア */
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dbClose();
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return this.bExceptionFlog;
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}
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public ArrayList<String> getSDBName() {
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return this.sDBName;
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}
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}
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```
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1
追記
test
CHANGED
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File without changes
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test
CHANGED
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@@ -169,3 +169,159 @@
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接続はこれを使っています。
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テストのためにsysoutを書いています。
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追記––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
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エラーとメインメソッドを記述した物を書きます。
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erorr
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```
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予期せぬエラーが発生しました。
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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
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The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
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at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
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at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
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at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
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at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
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at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
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at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)
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at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:342)
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at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2188)
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at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2221)
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at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2016)
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at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)
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at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
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at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
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at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
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at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
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at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
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at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
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at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
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at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
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at java.sql.DriverManager.getConnection(DriverManager.java:664)
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at java.sql.DriverManager.getConnection(DriverManager.java:247)
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at db_test.DB_Connection.dbConnect(DB_Connection.java:32)
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at db_test.Test.main(Test.java:13)
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Caused by: java.net.ConnectException: Connection refused (Connection refused)
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240
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241
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at java.net.PlainSocketImpl.socketConnect(Native Method)
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at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
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244
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245
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at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
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246
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247
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at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
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248
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249
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at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
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250
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251
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at java.net.Socket.connect(Socket.java:589)
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252
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253
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at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
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254
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255
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at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:301)
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256
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257
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... 16 more
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成功
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```
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main
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```java
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package db_test;
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270
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271
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273
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import java.util.ArrayList;
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274
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275
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276
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277
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public class Test {
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278
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279
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280
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281
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public static void main(String[] args) {
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282
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283
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284
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285
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ShowDB sdbTest = new ShowDB();
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286
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287
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ArrayList<String> alRlt;
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288
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289
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boolean bTestFlog = true;
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290
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291
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292
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sdbTest.dbConnect();
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294
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//bTestFlog = sdbTest.showDB();
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296
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297
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298
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299
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if (bTestFlog == false) {
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300
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301
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System.out.println("エラー");
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302
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303
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} else {
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304
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305
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System.out.println("成功");
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306
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307
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alRlt = sdbTest.getSDBName();
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308
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309
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310
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311
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for (String sDNmae : alRlt) {
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312
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313
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System.out.println(sDNmae);
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314
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315
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}
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316
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317
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}
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318
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319
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}
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320
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321
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}
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322
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+
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323
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+
```
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324
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+
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325
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326
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+
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327
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+
環境の問題でしょうか？
|