我们通过在查询语法连接字符串在代码中创建查询apostrope(')包含字符串要创建查询的所有属性在运行时添加一个节点。暗号查询: - 允许在查询
The query is like this in the code where
nodeLabel =String
properties = JSONObject
String query = "CREATE (n:" + nodeLabel + "{" + properties
+ "}) RETURN n";
错误执行查询创建(n:quiz{name:"1506077464525",createtime:1506077464525,title:"bernoulli's theory",duration:15,privacy:"follower",status:"draft"}) return n with params {}
因为在java代码查询其不允许撇号(')。
同样的查询在Neo4j的浏览器中执行,而是通过代码试图在相同的查询不执行。
如何解决此问题并允许相同。
问题2: -同样的,更新所述节点的属性发生问题。
我试图代码,但它给我的系列化错误。
Connection connect = null;
int status = 00;
try {
connect = graphdbConnect();
StringBuilder sb = new StringBuilder();
for (Object key : propertiesMap.keySet()) {
if (sb.length() != 0) {
sb.append(",");
}
sb.append("n." + key + " = " + propertiesMap.get(key));
System.out.println(sb);
}
String query = "match (n{name:'" + nodeName + "'}) set {1}"
+ " return n.name";
query=query.toLowerCase();
try (PreparedStatement preparedStatement = connect.prepareStatement(query)){
preparedStatement.setObject(1,sb);
System.out.println(query+" ---> query");
preparedStatement.executeQuery();
status = ServerStatusReport.OK();
} catch (SQLException e) {
e.printStackTrace();
}
Error:-Error executing query match (n{name:'1506160405300'}) set n.{1} return n.name with params {1=n.title = Asjdkjsbd's} at org.neo4j.jdbc.Neo4jConnection.executeQuery(Neo4jConnection.java:372) at org.neo4j.jdbc.Neo4jPreparedStatement.executeQuery(Neo4jPreparedStatement.java:46) at com.edubot.server.Neo4jQueries.updateNodeProperty1(Neo4jQueries.java:622) at com.edubot.server.course.CourseNeo4jQueries.updateCourseTitle(CourseNeo4jQueries.java:490) at com.edubot.server.course.CourseServiceImpl.updateCourseTitle(CourseServiceImpl.java:1215) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:587) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:333) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:303) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373) at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669) at com.edubot.server.CORSFilter.doFilter(CORSFilter.java:51) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.IllegalArgumentException: Could not serialize value 1 n.title = Asjdkjsbd's at org.neo4j.jdbc.rest.JsonUtils.serialize(JsonUtils.java:101) at org.neo4j.jdbc.rest.Statement.toJson(Statement.java:48) at org.neo4j.jdbc.rest.Statement.toJson(Statement.java:68) at org.neo4j.jdbc.rest.TransactionalQueryExecutor.post(TransactionalQueryExecutor.java:112) at org.neo4j.jdbc.rest.TransactionalQueryExecutor.commit(TransactionalQueryExecutor.java:135) at org.neo4j.jdbc.rest.TransactionalQueryExecutor.executeQueries(TransactionalQueryExecutor.java:198) at org.neo4j.jdbc.rest.TransactionalQueryExecutor.executeQuery(TransactionalQueryExecutor.java:208) at org.neo4j.jdbc.Neo4jConnection.executeQuery(Neo4jConnection.java:363) ... 38 more
您可以包括实际的错误信息?那是查询您的代码生成的Cypher打印输出吗?我提供了一个答案,应该能够捕获Cypher字符串中的所有问题。 – Tezra