Oracle JDBC Thin Driver - OracleDataSource Sınıfı

Giriş
Şu satırı dahil ederiz.

import oracle.jdbc.pool.OracleDataSource;

DataSource arayüzünü gerçekleştirir.

Kullanım
1. Default constructor ile nesne yaratılır

2. setX metodları ile bağlantı ayarları belirtilir.

3. setX metodlarını teker teker çağırmak istemiyorsak, setConnectionProperties() ile hepsi bir Property nesnesi olarak geçilir.

4. setXEnabled metodları ile bazı özellikler etkinleştirilir.

5. getConnection() ile connection alınır

constructor
Şöyle yaparız.

OracleDataSource dataSource = new OracleDataSource();

getConnection metodu
Şöyle yaparız.

Connection connection = dataSource.getConnection();

setConnectionProperties

Şöyle yaparız

import oracle.jdbc.OracleConnection;
import oracle.jdbc.pool.OracleDataSource;

Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
info.put(OracleConnection.CONNECTION_PROPERTY_FAN_ENABLED, false);

OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);

setDriverType metodu

Şöyle yaparız.

OracleDataSource dataSource = new OracleDataSource();
dataSource.setUser(userName);
dataSource.setPassword(password);
dataSource.setURL(dataSourceUrl);
dataSource.setImplicitCachingEnabled(true);
dataSource.setFastConnectionFailoverEnabled(true);
dataSource.setDriverType(driverClass);

setFastConnectionFailoverEnabled metodu
Bu metod yeni sürümlerde artık yok. Açıklaması şöyle. Veri tabanı kapanıp açılırsa geçersiz hale gelen bağlantılar temizlenir.

When the DB restarts, do you remove the invalid connections from the pool using a ClearPool type API or Oracle Fast Connection Failover (FCF)? If the answer is no, that's the likely reason for the timeout or error when pooling is on.

The invalid connections remain in the pool and the app is picking up one of these connections.

The ClearPool APIs and/or FCF are intended to resolve this HA issue. ClearPool is a manual process unfortunately and is not a great solution for this specific HA situation. Most customers prefer to automate connection cleanup with FCF.

To use FCF, your DB needs to enable Fast Application Notification, then turn on FCF on the server side. On the client side, you just turn HA Events=true in the connection string, which should already be turned on by default if you are using ODP.NET 12.2.

Şöyle yaparız.

dataSource.setFastConnectionFailoverEnabled(true);

setImplicitCachingEnabled metodu

Şöyle yaparız.

dataSource.setImplicitCachingEnabled(true);

setPassword metodu
Şöyle yaparız.

String password =...;
dataSource.setPassword(password);

setUrl metodu
Şöyle yaparız.

String url = "jdbc:oracle:thin:scott/tiger@//myhost:1521/orcl");
dataSource.setURL(url);

Bu metod yerine ayrı ayrı setter'lar kullanılabilir. Şöyle yaparız.

dataSource.setServerName("xxx");
dataSource.setPortNumber(xxx);
dataSource.setDriverType("thin");
dataSource.setNetworkProtocol("tcp");
dataSource.setDatabaseName("xxxx");

setUser metodu
Şöyle yaparız.

String username = ...;
dataSource.setUser(username);

Diğer
Örnek
Şöyle yaparız.

<bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource">
    <property name="dataSourceName" value="ds" />
    <property name="URL"
        value="jdbc:oracle:thin:@127.0.0.1:1521:test" />
    <property name="user" value="system" />
    <property name="password" value="3123312257" />
</bean>

Örnek
Şöyle yaparız.

@Bean
DataSource dataSource() throws SQLException {
  OracleDataSource dataSource = new OracleDataSource();
  dataSource.setUser("yourusername");
  dataSource.setPassword("yourpassword");
  dataSource.setURL("jdbc:oracle:thin:@yourserver:1521:xe");
  dataSource.setImplicitCachingEnabled(true);
  dataSource.setFastConnectionFailoverEnabled(true);
  return dataSource;
}    

Örnek

Şöyle yaparız

import oracle.jdbc.pool.OracleDataSource;

public static void main(String[] args) {
  OracleDataSource ods;
  try {
    ods = new OracleDataSource();
    // jdbc:oracle:thin@[hostname]:[port]/[DB service/name]
    ods.setURL("jdbc:oracle:thin:@localhost:1521/FREEPDB1");
    ods.setUser("[Username]");
    ods.setPassword("[Password]");
    Connection conn = ods.getConnection();
    PreparedStatement stmt = conn.prepareStatement("SELECT 'Hello World!' FROM dual");
    ResultSet rslt = stmt.executeQuery();
    while (rslt.next()) {
      System.out.println(rslt.getString(1));
    }
  } catch (SQLException e) {
    e.printStackTrace();
  }
}