[英]connect neo4j database with java api
早上好,
我在 neo4j 中执行此查询时出错:查询无法以 USE GRAPH 结束(必须是 RETURN 或更新子句)(第 1 行,第 5 列(偏移量:4))
“使用 eindb;”
package org.einaudi.impfilesjson;
import org.neo4j.driver.AuthTokens;
import org.neo4j.driver.Driver;
import org.neo4j.driver.GraphDatabase;
import org.neo4j.driver.Result;
import org.neo4j.driver.Session;
public class App implements AutoCloseable {
private final Driver driver;
public App(String uri, String user, String password) {
driver = GraphDatabase.driver( uri, AuthTokens.basic( user, password ) );
}
@Override
public void close() throws Exception
{
driver.close();
}
public void print greeting( final String message )
{
try ( Session session = driver.session() )
{
Result res = session.run( "USE eindb;" );
System.out.println(res.toString());
}
}
public static void main( String[] args ){
System.out.println( "Hello World!" );
App app;
try {
app = new App( "bolt://localhost:11003", "neo4j", "Admpa" );
app.printGreeting( "hello, world" );
}catch(Exception e) {
System.out.println(e.getMessage());
}
}
}
如何通过 java API 在 neo4j 中选择特定数据库?
文档的这一部分将为您提供帮助。 https://neo4j.com/docs/java-manual/current/cypher-workflow/#java-database-selection
这会将名为“foo”的数据库设置为 session 的默认值。
try ( Session session = driver.session(SessionConfig.forDatabase( "foo" )) )
您还可以在 cypher 查询中指定数据库,但您需要的不仅仅是USE
子句。
Result res = session.run( "USE eindb match (n) return count(n) as nodeCount" );
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