ユーザーがidを入力した場合、driverIDにユーザー入力を使用し、onJobをtrueに変更する必要があります。ユーザは、ドライバIDとして1を入力した場合JDBCでの変数の使用
そこで、例えば、ID番号1のドライバはここで1
にonJob変数の変化が現在自分のコードである必要があります。
public class TaxiDriver {
//String driverLocation = DRIVERFIRSTLOCATION;
//String destinationintoAPI;
//JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/DRIVER";
//Database credentials
static final String USER = "user";
static final String PASS = "password";
String driverId;
static Scanner reader = new Scanner(System.in);
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try {
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
System.out.println("Connected database successfully...");
System.out.println("Assign a driver to a jo...");
reader.nextInt();
//STEP 4: Execute a query
System.out.println("Creating statement...");
stmt = conn.createStatement();
String sql = "UPDATE Drivers " +
"SET OnJob = 1 WHERE id = (driverId)";
stmt.executeUpdate(sql);
// Now you can extract all the records
// to see the updated records
sql = "SELECT id, license, first, last, OnJob, Email, Telephone, Address, Postcode, Veichle FROM Drivers";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
//retrieve by column name
int id = rs.getInt("id");
int license = rs.getInt("license");
String first = rs.getString("first");
String last = rs.getString("last");
int OnJob = rs.getInt("OnJob");
String Email = rs.getString("Email");
String Telephone = rs.getString("Telephone");
String Address = rs.getString("Address");
String Postcode = rs.getString("Postcode");
String Veichle = rs.getString("Veichle");
//Display
System.out.print("ID: " + id);
System.out.print(", license: " + license);
System.out.print(", First: " + first);
System.out.print(", Last: " + last);
System.out.print(", Email; " + Email);
System.out.print(", Telephone; " + Telephone);
System.out.print(", Address; " + Address);
System.out.print(", Postcode; " + Postcode);
System.out.print(", Veichle;" + Veichle);
if (OnJob == 0) {
System.out.println(": Driver is aviliable for pickup");
} else {
System.out.println(": Driver is not aviliable for pickup");
}
}
rs.close();
} catch (SQLException se) {
//Handle errors for JDBC
se.printStackTrace();
} catch (Exception e) {
//Handle errors for Class.forName
e.printStackTrace();
} finally {
//finally block used to close resources
try {
if (stmt != null)
conn.close();
} catch (SQLException se) {
}// do nothing
try {
if (conn != null)
conn.close();
} catch (SQLException se) {
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
}//end JDBCExample
現在、これらのエラーが発生しています。
Connecting to a selected database...
Tue May 03 00:18:28 BST 2016 WARN: Establishing SSL connection without server's identity verification is not recommended.
According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set.
For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'.
You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Connected database successfully...
Assign a driver to a jo...
2
Creating statement...
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'driverId' in 'where clause'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.Util.getInstance(Util.java:387)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:939)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2547)
at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1541)
at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2605)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1469)
at TaxiDriver.main(TaxiDriver.java:71)
Goodbye!
事前に感謝します。
ありがとう、私は値を読み取ることを忘れていたとは思えません。 –