Java 驱动程序

本节展示 Neo4j 1.7 Java 驱动程序与 4.x Java 驱动程序之间的重大变化。

Neo4j 的最新 Java 驱动程序版本可在 Java 驱动程序的官方页面 上找到。

示例 1. 1.7 Java 驱动程序与 4.0 Java 驱动程序之间变化的示例
4.0 Java 驱动程序的示例代码 1.7 Java 驱动程序的示例代码
import org.neo4j.driver.Bookmark;
import org.neo4j.driver.Driver;
import org.neo4j.driver.Query;
import org.neo4j.driver.Result;
import org.neo4j.driver.Session;
import org.neo4j.driver.SessionConfig;
import org.neo4j.driver.Transaction;
import org.neo4j.driver.Values;
...

private final Driver driver;
...
public void printGreeting( String message, Bookmark bookmark )
{
   SessionConfig sessionConfig = SessionConfig.builder()
     .withDatabase( "neo4j" )
     .withDefaultAccessMode( AccessMode.WRITE )
     .withBookmarks( bookmark ).build();

   try ( Session session = driver.session( sessionConfig );
         Transaction transaction = session.beginTransaction() )
   {
      Query query = new Query( "CREATE (a:Greeting) SET a.message = $message RETURN a.message + ', from node ' + id(a)", Values.parameters( "message", message ) );

      Result result = transaction.run( query );
      String greeting = result.single().get( 0 ).asString();
      System.out.println( greeting );
      transaction.commit(); // commit immediately here
   }
}
import org.neo4j.driver.v1.AccessMode;
import org.neo4j.driver.v1.Driver;
import org.neo4j.driver.v1.Session;
import org.neo4j.driver.v1.Statement;
import org.neo4j.driver.v1.StatementResult;
import org.neo4j.driver.v1.Transaction;
import org.neo4j.driver.v1.Values;

...

private final Driver driver;
...
public void printGreeting( String message, String bookmark )
{




   try ( Session session = driver.session( AccessMode.WRITE, bookmark );
         Transaction transaction = session.beginTransaction() )
   {
       Statement query = new Statement( "CREATE (a:Greeting) SET a.message = $message RETURN a.message + ', from node ' + id(a)", Values.parameters( "message", message ) );


       StatementResult result = transaction.run( query );
       transaction.success(); // mark success, actually commit will happen in transaction.close()
       String greeting = result.single().get( 0 ).asString();
       System.out.println( greeting );
   }
}
© . This site is unofficial and not affiliated with Neo4j, Inc.