Question

 /**
     * Returns the property key with the given name. If automatic type making is enabled, it will make the property key
     * using the configured default type maker if a key with the given name does not exist.
     *
     * @param name name of the property key to return
     * @return the property key with the given name
     * @throws IllegalArgumentException if a property key with the given name does not exist or if the
     *                                  type with the given name is not a property key
     * @see PropertyKey
     */
    public PropertyKey getPropertyKey(String name);

getPropertyKey方法将始终返回prpertyKey。

Answer 1

要检查数据库中是否存在密钥，请使用：

mgmt.containsRelationType(keyToCheck)

Answer 2

如果是最新版本的Titan（1.0.0），您可以使用com.thinkaurelius.titan.core.TitanTransaction检查Titan数据库架构中是否存在属性键。 http://thinkaurelius.github.io/titan/javadoc/1.0.0/com/thinkaurelius/titan/core/TitanTransaction.html

示例：

TitanTransaction tt = TitanGraph.newTransaction();
boolean exists = tt.containsPropertyKey("keyName");

如何检查Titan数据库中已存在的PropertyKey

2 个答案: