매개 변수 JtextField에서 java/jdbc를 사용하여 전달

Question

3 개의 키 값으로 더비 데이터베이스를 검색 할 수 있어야합니다. GUI를 설정하고 데이터베이스의 데이터로 채울 수 있습니다. 어느 방향으로나 스크롤 할 수 있도록 설정했습니다. 내가 겪고있는 문제는 쿼리가 실패한 주요 필드 중 하나에 대한 특정 검색을 수행하는 메소드를 만들 때입니다. 다음은 검색을 용이하게하기 위해 사용하려는 방법입니다. 문을 사용하여 시도하고 문자열 문에 변수를 연결하고 준비된 문을 사용하여 시도하고 변수를 바인딩했습니다. 어느 쪽도 나는 일하게 될 수 없다. 오류가 발생한 코드에 표시했습니다.

public static void Search(){ 
    String idField = InitGUI.getidField().getText(); 
    String sql = ("SELECT * FROM MYDB.Employee WHERE Employee ID = '"+idField +"'"); 

    try { 

//  prepStat = dbCon.prepareStatement(sql); 
//  prepStat.setString(1, idField); 
//  rs = prepStat.executeQuery(); 
    rs = stmt.executeQuery(sql);  <== This is where the error occurs. 
    SqlStatements.SearchResult(rs.getRow()); 
    } catch (SQLException e) { 

     e.printStackTrace(); 
    } 
} 

다음은 스택 추적입니다.

Connected to database 
java.sql.SQLSyntaxErrorException: Syntax error: Encountered "ID" at line 1, column 44. 
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source) 
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source) 
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source) 
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source) 
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source) 
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source) 
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source) 
at org.apache.derby.impl.jdbc.EmbedStatement.executeQuery(Unknown Source) 
at Scheduler.DBConnector.Search(DBConnector.java:77) 
at Scheduler.myActionListener.actionPerformed(myActionListener.java:20) 
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) 
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) 
at javax.swing.DefaultButtonModel.setPressed(Unknown Source) 
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) 
at java.awt.Component.processMouseEvent(Unknown Source) 
at javax.swing.JComponent.processMouseEvent(Unknown Source) 
at java.awt.Component.processEvent(Unknown Source) 
at java.awt.Container.processEvent(Unknown Source) 
at java.awt.Component.dispatchEventImpl(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) 
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) 
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Window.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
at java.awt.EventQueue.access$400(Unknown Source) 
at java.awt.EventQueue$2.run(Unknown Source) 
at java.awt.EventQueue$2.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) 
at java.awt.EventQueue$3.run(Unknown Source) 
at java.awt.EventQueue$3.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source) 
at java.awt.EventQueue.dispatchEvent(Unknown Source) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
at java.awt.EventDispatchThread.run(Unknown Source) 
Caused by: java.sql.SQLException: Syntax error: Encountered "ID" at line 1, column 44. 
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source) 
at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source) 
... 46 more 
Caused by: ERROR 42X01: Syntax error: Encountered "ID" at line 1, column 44. 
at org.apache.derby.iapi.error.StandardException.newException(Unknown Source) 
at org.apache.derby.impl.sql.compile.ParserImpl.parseStatement(Unknown Source) 
at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source) 
at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source) 
at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown Source) 
... 40 more 

Answer 1

당신은 Employee와 ID 사이의 .을 잊지 마세요?
"SELECT * FROM MYDB.Employee WHERE Employee.ID = "+idField

stacktrace Syntax error은 SQL 구문이 잘못되었음을 나타냅니다. Encoutered "ID" at line 1은 Employee과 ID 사이의 구문 분석에 실패했음을 의미합니다.