Я скачал aws sdk и подключил свою учетную запись и базу данных. Но сейчас я не знаю, что мне нужно делать дальше. Как вставить, удалить или создать таблицу через Java на Eclipse.
Я знаю, чтобы сделать это в локальной базе данных. Я попытался изменить URL-адрес в функции getConnection()
на мою конечную точку на затмении, но постоянно получаю сообщение об ошибке «Доступ запрещен для пользователя 'aws'@'xxx.xxx.xxx.xxx' (с использованием пароля: YES)" (реальный IP-адрес)модифицировано по соображениям безопасности).
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;
public class MySQLAccess {
private Connection connect = null;
private Statement statement = null;
private PreparedStatement preparedStatement = null;
private ResultSet resultSet = null;
private static final String url = "jdbc:mysql://aws.cyduxshnlizb.ap-south-1.rds.amazonaws.com:3306";
final private String user = "myusername";
final private String passwd = "mypassword";
public void readDataBase() throws Exception {
try {
// This will load the MySQL driver, each DB has its own driver
Class.forName("com.mysql.jdbc.Driver");
// Setup the connection with the DB
connect = DriverManager
.getConnection(url,user,passwd);
// Statements allow to issue SQL queries to the database
statement = connect.createStatement();
// Result set get the result of the SQL query
resultSet = statement
.executeQuery("select * from feedback.comments");
writeResultSet(resultSet);
// PreparedStatements can use variables and are more efficient
preparedStatement = connect
.prepareStatement("insert into feedback.comments values (default, ?, ?, ?, ? , ?, ?)");
// "myuser, webpage, datum, summary, COMMENTS from feedback.comments");
// Parameters start with 1
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, "TestSummary");
preparedStatement.setString(6, "TestComment");
preparedStatement.executeUpdate();
preparedStatement = connect
.prepareStatement("SELECT myuser, webpage, datum, summary, COMMENTS from feedback.comments");
resultSet = preparedStatement.executeQuery();
writeResultSet(resultSet);
// Remove again the insert comment
preparedStatement = connect
.prepareStatement("delete from feedback.comments where myuser= ? ; ");
preparedStatement.setString(1, "Test");
preparedStatement.executeUpdate();
resultSet = statement
.executeQuery("select * from feedback.comments");
writeMetaData(resultSet);
} catch (Exception e) {
throw e;
} finally {
close();
}
}
private void writeMetaData(ResultSet resultSet) throws SQLException {
// Now get some metadata from the database
// Result set get the result of the SQL query
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 {
// ResultSet is initially before the first data set
while (resultSet.next()) {
// It is possible to get the columns via name
// also possible to get the columns via the column number
// which starts at 1
// e.g. resultSet.getSTring(2);
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);
}
}
// You need to close the resultSet
private void close() {
try {
if (resultSet != null) {
resultSet.close();
}
if (statement != null) {
statement.close();
}
if (connect != null) {
connect.close();
}
} catch (Exception e) {
}
}
}