대부분의 코드가 작동하는 것처럼 보입니다. 그러나 스레드 "main"의 예외가 계속 발생합니다 java.sql.SQLException : 매개 변수 인덱스가 범위를 벗어났습니다. 매개 변수는 0입니다. readDatabase()의 finally 블록 이후에 발생합니다. 그것은 print 서술문 System.out.println에 도달하지 않는다 ("여기에 오지 않는다"); 이유를 모르겠습니다. 모든 것이 처리되는 클래스가 있습니다. 메인 클래스에서이 클래스의 객체를 만들고 readDatabase()를 호출합니다.매개 변수 인덱스가 범위를 벗어남 finally 블록의 마지막 부분에있는 mysql
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//static because when creating an object of it in main, you won't have to make an object of the outer class (SQLProject) first
public class MySQLAccess{
private Connection connect = null;
private Statement statement = null;
private PreparedStatement preparedStatement = null;
private ResultSet resultSet = null;
public void readDatabase() throws Exception
{
try{
Class.forName("com.mysql.jdbc.Driver");
connect = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "");
statement = connect.createStatement();
System.out.println("here1");
resultSet = statement.executeQuery("select * from test.comments");
writeResultSet(resultSet);
preparedStatement = connect.prepareStatement("INSERT INTO test.comments values(default, ?, ?, ?, ?, ?, ?)");
//columsn in test.comments
// myuser, email, webpage, datum, summary, COMMENTS
preparedStatement.setString(1, "Test");
preparedStatement.setString(2, "TestEmail");
preparedStatement.setString(3, "TestWebpage");
preparedStatement.setDate(4, new java.sql.Date(2009, 12, 11));
preparedStatement.setString(5, "Test Summary");
preparedStatement.setString(6, "Test Comment");
System.out.println("here2");
preparedStatement.executeUpdate();
preparedStatement = connect.prepareStatement("SELECT myuser, webpage, datum, summary, comments FROM test.comments");
System.out.println("here3");
resultSet = preparedStatement.executeQuery();
writeResultSet(resultSet);
preparedStatement = connect.prepareStatement("DELETE FROM test.comments WHERE myuser='?';");
preparedStatement.setString(1, "Test");
preparedStatement.executeUpdate();
resultSet = statement.executeQuery("SELECT * FROM test.comments;");
System.out.println("Writing meta data");
writeMetaData(resultSet);
}
catch (Exception e){
throw e;
}
finally{
close();
System.out.println("ALMOST");
}
System.out.println("DOESN'T GET HERE");
}
private void writeMetaData(ResultSet resultSet) throws SQLException
{
System.out.println("The columns in the table are: ");
System.out.println("Table: " + resultSet.getMetaData().getTableName(1));
for(int i=1;i<=resultSet.getMetaData().getColumnCount(); i++)
{
System.out.println("Column " + i + " " + resultSet.getMetaData().getColumnName(i));
}
}
private void writeResultSet(ResultSet resultSet) throws SQLException
{
while(resultSet.next())
{
String user = resultSet.getString("myuser");
String website = resultSet.getString("webpage");
String summary = resultSet.getString("summary");
Date date = resultSet.getDate("datum");
String comment = resultSet.getString("comments");
System.out.println("User: " + user);
System.out.println("website: " + website);
System.out.println("summary: " + summary);
System.out.println("date: " + date);
System.out.println("comment: " + comment);
}
}
private void close()
{
try{
if(resultSet != null)
resultSet.close();
if(statement != null)
statement.close();
if(connect != null)
connect.close();
}
catch(Exception e){
e.printStackTrace();
System.out.println("hello");
System.out.println(e);
}
}
}//private inner class
전체 스택 트레이스를 제공, 일부 예외가 - 마지막으로이 – Subin