CN102193985A - Method for canceling node data relation in graphical database offline transaction - Google Patents

Abstract

The invention relates to a method for canceling a node data relation in a graphical database offline transaction. The method comprises the following steps of: 1) calling an application program interface (API) by using a client program, transmitting parameter data to a graphical database; 2) entering a synchronization zone; 3) checking whether source node data is locked by a transaction; if the source node data is locked by the transaction, turning to the step 8); and if the source node data is not locked by the transaction, continuing to execute the following steps; 4) checking whether target node data is locked by the transaction; if the target node data is locked by the transaction, turning to the step 8); and if the target node data is not locked by the transaction, continuing to execute the following steps; 5) checking whether the relation related to the source node data is locked by the transaction; if the relation is locked by the transaction, turning to the step 8); and if the relation is not locked by the transaction, continuing to execute the following steps; 6) canceling the relation; 7), exiting the synchronization zone, and ending the program; 8) waiting for a period of time, judging whether the operation is overtime; if the operation is overtime, exiting an executing logic; and if the operation is not overtime, turning to the step 2) and entering the synchronization zone again. Compared with the operation of canceling the node data relation in the online transaction, the operation of canceling the node data relation in the offline transaction avoids a large amount of data locking check so that the executing efficiency is higher.

Description

The method of cancellation node data relation in the non-online transaction of graphic data base

Technical field

The present invention relates to the method for cancellation node data relation in the non-online transaction of a kind of graphic data base.

Background technology

Usually in Database Systems, affairs are discrete unit of work.For example, a db transaction can be to revise a user's the account's balance or the write operation of stock item.Online transaction processing system is the variation of the status of the data that link to each other with affairs of acquisition process and shared data bank and other file in real time.In Transaction Processing, affairs are carried out immediately.It is simple carrying out affairs under sole user, single database environment, and this is because do not have collision problem or to demand synchronous between database.Under a distributed environment, write operation often takes place on a plurality of database servers concurrently.Such concurrent transaction is handled needs " rollback " mechanism, under the situation that guarantees thrashing in write operation, still guarantees the integrality of database.Affairs or affirmation together, or abandon.If one or more system responses relevant with affairs are inconsistent, this means that fault may appear in system or communication, thereby will abandon affairs.As can be seen, when a plurality of users attempt to change simultaneously same of data, collision problem has just appearred.

Summary of the invention

In order to address the above problem, the present invention proposes the method for cancellation node data relation in the non-online transaction of a kind of graphic data base, it can cancel the node data relation when graphic data base is not opened affairs.

The technical solution used in the present invention is as follows:

The method of cancellation node data relation in the non-online transaction of a kind of graphic data base is characterized in that:

Non-Transaction Processing is divided into three layers from top to bottom:

The superiors are the API that is exposed to the external call program;

The middle layer is an affairs logic control layer, be divided into synchronization zone and asynchronous district by class of operation, the synchronization zone means can only have an operation to carry out at one time, other operate in to enter and all are in waiting status between the synchronization zone, this mechanism utilizes the thread synchronization lockout feature of Java language to realize, the operation in asynchronous district is then unrestricted, all can carry out at any time;

Orlop in DataSet, is preserved the status information of online transaction self for the DataSet operation level of abstraction of storage data, and the transaction status attribute information of data;

The definition information of each node Node in the graphic data base is kept at name is called among the data set DataSet of graphic_db_node_def, the data structure of this DataSet is as follows:

The row title	Data type	Explanation
			?node_id	Number	The ID that the overall situation is unique
?name	String	Be used to preserve the title of Node

With Relation relation between Node and the Node is described, each Relation all has title, source Node, a target Node that the overall situation is unique, by the direction of source Node to target Node, be referred to as forward, be referred to as oppositely to the direction of initial Node by target Node, the definition information of each Relation is kept at name is called among the DataSet of graphic_db_relation_def, the data structure of this DataSet is as follows:

The row title

Data type

Explanation

relation_id	Number	The ID that the overall situation is unique
			name	String	Be used to preserve the title of Relation
source_node	Number	The ID of source Node
			target_node	Number	The ID of target Node

Data among two Node that connect by Relation can connect, and the link information of all data is kept at name is called among the DataSet of graphic_db_relation_record_def, and the data structure of this DataSet is as follows:

Carry out following steps:

1) CLIENT PROGRAM is called API, and supplemental characteristic is passed to graphic data base;

2) enter the synchronization zone;

3) check whether source node data is locked by affairs, if step 8) is then changeed in locking, otherwise the step below continuing to carry out;

4) check whether the destination node data are locked by affairs, if step 8) is then changeed in locking, otherwise the step below continuing to carry out;

5) check whether the Relation relevant with source node data is locked by affairs, if step 8) is then changeed in locking, otherwise the step below continuing to carry out;

6) cancellation relation;

7) withdraw from the synchronization zone, EOP (end of program);

8) wait for a period of time;

9) whether decision operation is overtime, if the overtime actuating logic that then withdraws from, otherwise changes step 2) enter the synchronization zone once more.

Further:

In described step 1), API imports following parameter: source_node_name into, the source node title; Target_node_name, the destination node title; Relation_name, the title of the relation that appointment will be cancelled; Source_record_RID, the RID of assigned source node data; Target_record_RID, the RID of intended target node data; Source_node_RID, the RID of source node definition of data; Target_node_RID, the RID of destination node definition of data.

In described step 3), check that source node data is whether as follows by the detailed step that affairs lock: ource_node_name determines source node by the API parameter s, according to the data in the source_record_RID query source node that imports among the API, whether the value of checking row _ tx_no in these data is empty, if be not empty, mean that then this record is locked by affairs.

In described step 4), check that the destination node data are whether as follows by the detailed step that affairs lock: arget_node_name determines destination node by the API parametric t, according to the data in the target_record_RID query aim node that imports among the API, whether the value of checking row _ tx_no in these data is empty, if be not empty, mean that then this record is locked by affairs.

In described step 5), check that the Relation relevant with source node data is whether as follows by the detailed step that affairs lock: Query Name is the DataSet of graphic_db_relation_record_def, the record that source_record_RID that the value that all source_record or target_record row are obtained in filtration and API import into or target_record_RID equate, check successively these records _ the tx_no field, if the value that any record _ tx_no row are arranged means then that not for empty there is situation about being locked by other affairs in the Relation of related data.

In described step 6), the cancellation relation is divided into following steps in detail:

A. Query Name is the DataSet of graphic_db_relation_def, searches the identical record of parameter relation_name value that value and the API value of row name are gone into, and obtains the Relation RID of this record;

B. Query Name is the DataSet of graphic_db_relation_record_def, obtains data by following filtercondition:

The value of data relation_id row is the Relation RID that inquiry just now obtains;

The value of data source_node row is the source_node_RID that API imports into;

The value of data target_node row is the target_node_RID that API imports into;

The value of data source_record row is the source_record_RID that API imports into;

The value of data target_record row is the target_record_RID that API imports into;

Data physics deletion from DataSet with the coupling filtercondition.

The present invention has the following advantages:

Compare with the operation of cancellation node data relation in the online transaction, the operation of cancellation node data relation has avoided the lot of data locking to check in the non-online transaction, thereby it is higher to carry out efficient.

Description of drawings

Fig. 1 is the framework of graphic data base;

Fig. 2 is the graph of a relation between the node;

Fig. 3 is the storage modes of data in DataSet;

Fig. 4 is the figure that quotes between the node;

Fig. 5 is the Transaction Processing flow process;

Fig. 6 is non-Transaction Processing flow process;

Fig. 7 is the structure of non-Transaction Processing;

Fig. 8 is the treatment scheme of cancellation node data relation.

Embodiment

The present invention proposes the control method of cancellation node data relation in the non-online transaction of a kind of graphic data base, describe in detail below in conjunction with accompanying drawing.

The graphic data base general introduction

The framework of graphic data base of the present invention can be divided into three layers from top to bottom.As shown in Figure 1, the superiors are the tissue and the realization of various conceptual objects in the graph data.The middle layer is abstract data physical store interface layer, is several data sets DataSet with the data abstraction of physical store.Bottom is that physical store realizes layer, realizes by existing storage engines by program, such as: traditional relational database, XML file or the like.

DataSet (data set)

DataSet is the logic storage unit of data in the graphic data base, the logical definition of data in the graphic data base and database self all is stored among the DataSet, DataSet is an abstract interface, and the realization procedure stores that real data can be by following the DataSet interface is in the file of relational database, XML or user-defined format.Each DataSet is made up of unique title and several row (Column) of the overall situation.Following two kinds of data types are supported in tabulation among the DataSet:

Type	Explanation
		String	Be used to preserve the descriptor of Textuality
Number	Be used to preserve integer, floating number digital information, or be used for preserving Boolean information, represent true with 1, represent false. with-1

Table 1

Node (node)

Node is the logical block of storage data in the graphic data base, in graphic data base, each record entity can abstractly be Node all, such as when explaining an applications of computer network system, port in the switch, the network interface card of PC server, CPU, produce the manufacturer of accessory, we provide the client of service for it, user in the system, authority or the like, each Node has a title that the overall situation is unique, its distinctive attributes with some, be used for recording configuration information, for example: with respect to the client of our service, we are with its called after Customer, and it has following attribute: contractedAmount (contract total value), industry (affiliated industry), name (customer name), description (description) etc.In the present invention, the attribute of Node can be the data of following type.

Table 2

The definition information of each Node all is kept at name and is called among the DataSet of graphic_db_node_def, and the data structure of this DataSet is as follows:

The row title	Data type	Explanation
			?node_id	Number	The ID that the overall situation is unique
?name	String	Be used to preserve the title of Node

Table 3

Among each Node defined attribute information be kept at the name be called among the DataSet of graphic_db_node_attr_def, the data structure of this DataSet is as follows:

Table 4

Be directed to the definition of Node, similar following two tables of the DataSet of physical store:

Table 5

Table 6

The data message of each Node is kept among the DataSet of the same name with it, supposes that we have a name to be called the Node of Customer, and this Node has following attribute:

Property Name	Data type	Explanation
			RID	String	Database is built-in
name	String	Customer name
			contractedAmount	Number	Contract value
industry	Reference	Affiliated industry
			description	String	Client's descriptor

Table 7

Then the DataSet structure of this Node correspondence is:

Table 8

The similar following table of the DataSet of physical store:

Table 9

RID (Record ID, Record ID)

In graphic data base, each Node can have a name to be called the attribute of RID, and the RID value that is stored in each the bar data among the Node all is that the overall situation is unique, is recorded in sign in the graphic data base as this.The data type of RID is the String type.Each Node all contains this attribute.The RID form is: Node title+underscore+increase progressively numeral, a typical R ID numerical value is similar to following form: Industry_109.

Relation (relation)

The entity of each category information all can be abstract is Node, in real world applications, usually needs these Node by certain logical organization, and Relation is used for describing the membership credentials between Node and the Node.Suppose the now existing Node:Customer that represent client, representative system user's Node:SysUser, in real world, our sales force can become a user in the system, and be responsible for some clients sale, reach communication work.Therefore, we Relation that can set up a SysUserServeCustomer by name between SysUser and Customer explains relation between the two.We explain this relation with Fig. 2, and Relation is used to describe the special object that concerns between Node and the Node.Each Relation all has a title that the overall situation is unique, a source Node, a target Node.By the direction of source Node to target Node, we are referred to as forward, and we are referred to as oppositely to the direction of initial Node by target Node.

The definition information of each Relation all is kept at name and is called among the DataSet of graphic_db_relation_def, and the data structure of this DataSet is as follows:

The row title	Data type	Explanation
			relation_id	Number	The ID that the overall situation is unique
name	String	Be used to preserve the title of Relation
			source_node	Number	The ID of source Node
target_node	Number	The ID of target Node

Table 10

Be directed to the definition of Relation, the similar following table of the DataSet of physical store:

Table 11

According to the definition of Relation, the data among two Node that connect by Relation can connect.The link information of all data is kept at name and is called among the DataSet of graphic_db_relation_record_def, and the data structure of this DataSet is as follows:

Table 12

In application scenarios, the similar following table of the DataSet of its physical store:

Table 13

Reference (quoting)

In graphic data base was abstract, some Node commonly used can have relation with other most of Node, and these Node data volumes commonly used are very limited and can not change substantially, such as: country, province, city etc.If adopt the mode of Relation to explain, then need and other Node between the big magnitude relation set up, this maintenance to the later stage will cause certain difficulty.Under this kind situation, can consider to adopt the form of Reference to explain relation.A Node quotes another one Node by the attribute that it had, and realizes in form at it, and is largely similar with the Foreign Key (external key) of RDBMS (relational database).That preserve in the Dictionary attribute of a certain record is the RID of data recording among the another one Node.Node---the Customer that we discussed before considering has this attribute of (industry) industry, supposes that in our application scenarios, the quantity of industry is very limited, and can often not change.Then can quote certain bar record among this Node of Industry with the mode of Reference attribute.The storage mode of data in DataSet as shown in Figure 3.

We dot the Reference between the Node in the present invention, to be different from Relation, see Fig. 4.

Online transaction and non-online transaction

The operation of data can be divided in the graphic data base: " online transaction data manipulation " and " non-online transaction data manipulation ".Online transaction data manipulation steps in sequence is: create online transaction, carry out online transaction data manipulation (this operation can repeat repeatedly in an online transaction), submit to online transaction that operation is come into force or rollback online transaction abort operation.See shown in Figure 5.But not the online transaction data manipulation is not controlled by affairs, directly calls graphic data base API and gets final product, and sees shown in Figure 6.

As shown in Figure 7, non-Transaction Processing of the present invention is divided into three layers from top to bottom:

The superiors are the API that is exposed to the external call program.

The middle layer is an affairs logic control layer, be divided into synchronization zone and asynchronous district by class of operation, the synchronization zone means can only have an operation to carry out at one time, and other operate in to enter and all are in waiting status between the synchronization zone, and this mechanism utilizes the thread synchronization lockout feature of Java language to realize.The operation in asynchronous district is then unrestricted, all can carry out at any time.

Orlop in DataSet, is preserved the status information of online transaction self for the DataSet operation level of abstraction of storage data, and the transaction status attribute information of data.Non-online transaction self stateless information so do not need to preserve, is only preserved data message.

In graphic data base, the status data of online transaction is stored in name and is called among the DataSet of graphic_db_tx_def, and the data structure of this DataSet is as follows:

Table 14

Each Node all has a corresponding DataSet of the same name in graphic data base, and the Relation information between the data is kept at name and is called among the DataSet of graphic_db_relation_record_def.All default built-in following two row among these DataSet:

Table 15

The control of cancellation node data relation in the non-online transaction

As shown in Figure 8, in non-online transaction, the processing logic of cancellation node data relation is as follows:

(1) CLIENT PROGRAM is called API, and supplemental characteristic is passed to graphic data base.API imports following parameter into:

A.source_node_name, the source node title

B.target_node_name, the destination node title

C.relation_name, the title of the relation that appointment will be cancelled

D.source_record_RID, the RID of assigned source node data

E.target_record_RID, the RID of intended target node data

F.source_node_RID, the RID of source node definition of data

G.target_node_RID, the RID of destination node definition of data

(2) enter the synchronization zone, the synchronization zone utilizes the synchronized thread synchronization locking of Java language to realize at synchronization, only having an operation can enter the synchronization zone.

(3) check whether source node data is locked by affairs, if step (8) is then changeed in locking.Ource_node_name determines source node by the API parameter s, according to the data in the source_record_RID query source node that imports among the API, checks whether the value of row _ tx_no in these data is empty, if be not empty, means that then this record is locked by affairs.

(4) check whether the destination node data are locked by affairs, if step (8) is then changeed in locking.Arget_node_name determines destination node by the API parametric t, according to the data in the target_record_RID query aim node that imports among the API, whether the value of checking row _ tx_no in these data is empty, if be not empty, means that then this record is locked by affairs.

(5) check whether the Relation relevant with source node data is locked by affairs, if step (8) is then changeed in locking.Query Name is the DataSet of graphic_db_relation_record_def, the record that source_record_RID that the value that all source_record or target_record row are obtained in filtration and API import into or target_record_RID equate, check successively these records _ the tx_no field, if the value that any record _ tx_no row are arranged means then that not for empty there is situation about being locked by other affairs in the Relation of related data.

(6) cancellation relation.Being divided into following steps carries out:

A. Query Name is the DataSet of graphic_db_relation_def, searches the identical record of parameter relation_name value that value and the API value of row name are gone into, and obtains the Relation RID. of this record

B. Query Name is the DataSet of graphic_db_relation_record_def, obtains data by following filtercondition:

The value of data relation_id row is the Relation RID that inquiry just now obtains,

The value of data source_node row is the source_node_RID that API imports into,

The value of data target_node row is the target_node_RID that API imports into,

The value of data source_record row is the source_record_RID that API imports into,

The value of data target_record row is the target_record_RID that API imports into,

Data physics deletion from DataSet with the coupling filtercondition.

(7) withdraw from the synchronization zone.Jump out the synchronized method of thread locked.

(8) wait for 10 milliseconds.Carry out 10 milliseconds of the thread dormancy of current logic.

(9) whether decision operation is overtime, surpassed 30000 milliseconds (30 seconds) if this calls the time that enters the synchronization zone.It is overtime to show that then this calls, and withdraws from actuating logic.Otherwise change step (2) and enter the synchronization zone once more.

Claims (6)

1. cancel the method that node data concerns in the non-online transaction of graphic data base, it is characterized in that:

Non-Transaction Processing is divided into three layers from top to bottom:

The superiors are the API that is exposed to the external call program;

The middle layer is an affairs logic control layer, be divided into synchronization zone and asynchronous district by class of operation, the synchronization zone means can only have an operation to carry out at one time, other operate in to enter and all are in waiting status between the synchronization zone, this mechanism utilizes the thread synchronization lockout feature of Java language to realize, the operation in asynchronous district is then unrestricted, all can carry out at any time;

Orlop in DataSet, is preserved the status information of online transaction self for the DataSet operation level of abstraction of storage data, and the transaction status attribute information of data;

The definition information of each node Node in the graphic data base is kept at name is called among the data set DataSet of graphic_db_node_def, the data structure of this DataSet is as follows:

The row title Data type Explanation ?node_id Number The ID that the overall situation is unique ?name String Be used to preserve the title of Node

With Relation relation between Node and the Node is described, each Relation all has title, source Node, a target Node that the overall situation is unique, by the direction of source Node to target Node, be referred to as forward, be referred to as oppositely to the direction of initial Node by target Node, the definition information of each Relation is kept at name is called among the DataSet of graphic_db_relation_def, the data structure of this DataSet is as follows:

The row title Data type Explanation relation_id Number The ID that the overall situation is unique name String Be used to preserve the title of Relation source_node Number The ID of source Node target_node Number The ID of target Node

Data among two Node that connect by Relation can connect, and the link information of all data is kept at name is called among the DataSet of graphic_db_relation_record_def, and the data structure of this DataSet is as follows:

Carry out following steps:

1) CLIENT PROGRAM is called API, and supplemental characteristic is passed to graphic data base;

2) enter the synchronization zone;

3) check whether source node data is locked by affairs, if step 8) is then changeed in locking, otherwise the step below continuing to carry out;

4) check whether the destination node data are locked by affairs, if step 8) is then changeed in locking, otherwise the step below continuing to carry out;

5) check whether the Relation relevant with source node data is locked by affairs, if step 8) is then changeed in locking, otherwise the step below continuing to carry out;

6) cancellation relation;

7) withdraw from the synchronization zone, EOP (end of program);

8) wait for a period of time;

9) whether decision operation is overtime, if the overtime actuating logic that then withdraws from, otherwise changes step 2) enter the synchronization zone once more.

2. the method for cancellation node data relation in the non-online transaction of graphic data base as claimed in claim 1 is characterized in that:

In described step 1), API imports following parameter into:

Source_node_name, the source node title;

Target_node_name, the destination node title;

Relation_name, the title of the relation that appointment will be cancelled;

Source_record_RID, the RID of assigned source node data;

Target_record_RID, the RID of intended target node data;

Source_node_RID, the RID of source node definition of data;

Target_node_RID, the RID of destination node definition of data.

3. the method for cancellation node data relation in the non-online transaction of graphic data base as claimed in claim 2 is characterized in that:

In described step 3), check that source node data is whether as follows by the detailed step that affairs lock:

Ource_node_name determines source node by the API parameter s, according to the data in the source_record_RID query source node that imports among the API, checks whether the value of row _ tx_no in these data is empty, if be not empty, means that then this record is locked by affairs.

4. the method for cancellation node data relation in the non-online transaction of graphic data base as claimed in claim 2 is characterized in that:

In described step 4), check that the destination node data are whether as follows by the detailed step that affairs lock:

Arget_node_name determines destination node by the API parametric t, according to the data in the target_record_RID query aim node that imports among the API, whether the value of checking row _ tx_no in these data is empty, if be not empty, means that then this record is locked by affairs.

5. the method for cancellation node data relation in the non-online transaction of graphic data base as claimed in claim 2 is characterized in that:

In described step 5), check that the Relation relevant with source node data is whether as follows by the detailed step that affairs lock:

Query Name is the DataSet of graphic_db_relation_record_def, the record that source_record_RID that the value that all source_record or target_record row are obtained in filtration and API import into or target_record_RID equate, check successively these records _ the tx_no field, if the value that any record _ tx_no row are arranged means then that not for empty there is situation about being locked by other affairs in the Relation of related data.

6. the method for cancellation node data relation in the non-online transaction of graphic data base as claimed in claim 2 is characterized in that:

In described step 6), the cancellation relation is divided into following steps in detail:

A. Query Name is the DataSet of graphic_db_relation_def, searches the identical record of parameter relation_name value that value and the API value of row name are gone into, and obtains the Relation RID of this record;

B. Query Name is the DataSet of graphic_db_relation_record_def, obtains data by following filtercondition:

The value of data relation_id row is the Relation RID that inquiry just now obtains;

The value of data source_node row is the source_node_RID that API imports into;

The value of data target_node row is the target_node_RID that API imports into;

The value of data source_record row is the source_record_RID that API imports into;

The value of data target_record row is the target_record_RID that API imports into;

Data physics deletion from DataSet with the coupling filtercondition.

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