CN105608229A - System and method for synchronizing master-slave databases - Google Patents
System and method for synchronizing master-slave databases Download PDFInfo
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- CN105608229A CN105608229A CN201610064755.7A CN201610064755A CN105608229A CN 105608229 A CN105608229 A CN 105608229A CN 201610064755 A CN201610064755 A CN 201610064755A CN 105608229 A CN105608229 A CN 105608229A
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- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
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Abstract
The invention provides a system and method for synchronizing master-slave databases. The system comprises a cache creating module, an interceptor module and a database access module. The method comprises the steps: acquiring data sheets frequently used in a master database, and writing the data sheets in a cache chain table; creating an interceptor which is used for achieving identification and judgment on a database source to be accessed before achieving a business logic service method, wherein the service method comprises an adding, deleting and revising method and a querying method; if the service method carries out adding, deleting and revising operations, writing data in the cache chain table while writing the data in the master database, and synchronizing the data of the master database to a slave database; if the service method carries out a querying operation, judging whether data required exist in the cache chain table or not, reading the data directly from the cache chain table if the data required exist in the cache chain table, or reading the data from the slave database if the data required do not exist in the cache chain table. According to the system and the method, the problem that the databases are out of sync is solved, latest data are read in real time, and meanwhile, the access efficiency is increased.
Description
Technical field
The present invention relates to database synchronization field, relate in particular to a kind of master-slave database synchro system and sideMethod.
Background technology
Along with the fast development of internet, the scale of website application constantly expands in recent years, and portfolio is not yetDisconnected increasing, also more and more higher to the performance requirement of application system. Especially the performance of database, to systemPerformance impact is increasing, in order to alleviate the pressure of database, can use master-slave database to divide in projectFrom technology, wherein, master data is for additions and deletions data writing when changing data, from database forThe inquiry of data, but be synchronized to the process from database in data by MDL, need the regular hour,User, in the time of operation, can run into the nonsynchronous problem of data, and impact is normally used.
Summary of the invention
One of the technical problem to be solved in the present invention, is to provide a kind of master-slave database synchro system, separatesThe certainly nonsynchronous problem of database, realizes and reads in real time latest data, improves access efficiency.
One of the technical problem to be solved in the present invention is achieved in that a kind of master-slave database is synchronouslySystem, comprises buffer memory creation module, blocker module and database access module;
Described buffer memory creation module, writes buffer memory chain for obtaining the frequent tables of data using of MDLIn table;
Described blocker module, for creating blocker, is realizing service logic by described blockerBefore service method, realize the Discern and judge of database source to be visited, described service method comprises increasingRevise the method for operation and the method for query manipulation;
Described database access module, for realizing the service method of service logic, if described serviceMethod is to do additions and deletions to change operation, writes in buffer memory chained list when data being write to MDL, synchronousMDL data are to from database; If described service method is to do query manipulation, judgement is slowDeposit in chained list whether have desired data, if so, directly from buffer memory chained list, read, otherwise, to fromIn database, read.
Further, described system also comprises a configuration module, for creating an engineering, in described engineeringIn xml file, configure MDL, from database and blocker.
Further, described blocker module is specially: for creating blocker, define a thread officePortion's variable, described thread local variable is used for storing the title of data source, and described thread local variableDefault value is the data source of MDL, in the time realizing service logic service method, by described lineThe value of journey local variable judges database source to be visited.
Further, the notification type of described blocker is preposition notice.
Further, described database access module is specially: for realizing the service of service logicMethod, judges whether service method is that additions and deletions change method of operating, if so, removes described thread officeThe value of portion's variable, makes in the time of Dynamic Acquisition data source default access MDL; If described serviceMethod is to do query manipulation, in described thread local variable, puts into a value from database-name,First judge in buffer memory chained list whether have desired data, if so, directly from buffer memory chained list, read,Otherwise, in the time of Dynamic Acquisition data source, access corresponding from database.
Further, described system also comprises caching management module: in the time that execution additions and deletions change operation,Additions and deletions are changed to data and are inserted into the head of buffer memory chained list; In the time carrying out query manipulation, data query is moved on toThe head of buffer memory chained list; In the time that buffer memory chained list is full, start to delete from the data of the afterbody of buffer memory chained list.
Two of the technical problem to be solved in the present invention, is to provide a kind of master-slave database synchronous method, separatesThe certainly nonsynchronous problem of database, realizes and reads in real time latest data, improves access efficiency.
Two of the technical problem to be solved in the present invention is achieved in that synchronously side of a kind of master-slave databaseMethod, comprises the steps:
Step 1, obtain in MDL the frequent tables of data using and write in buffer memory chained list;
Step 2, create blocker, by described blocker realizing before service logic service methodRealize the Discern and judge of database source to be visited, described service method comprises that additions and deletions change the side of operationThe method of method and query manipulation;
Step 3, realize the service method of service logic, if described service method is to do additions and deletions to changeOperation, writes when data being write to MDL in buffer memory chained list, and synchronous MDL data arriveFrom database; If described service method is to do query manipulation, judges in buffer memory chained list and whether depositAt desired data, if so, directly from buffer memory chained list, read, otherwise, to reading from database.
Further, after described step 2, also comprise: create an engineering, at described engineering xml fileMiddle configuration MDL, from database and blocker.
Further, described step 2 is specially: create blocker, define a thread local variable,Described thread local variable is for storing the title of data source, and the default value of described thread local variable isThe data source of MDL, in the time realizing service logic service method, becomes by described thread localThe value of amount judges database source to be visited.
Further, the notification type of described blocker is preposition notice.
Further, described step 3 is specially: realize the service method of service logic, judge serviceWhether method is that additions and deletions change method of operating, if so, removes the value of described thread local variable, makesWhen Dynamic Acquisition data source, default access MDL; If described service method is to do query manipulation,In described thread local variable, put into a value from database-name, first judge in buffer memory chained listWhether there is desired data, if so, directly from buffer memory chained list, read, otherwise, at Dynamic Acquisition numberDuring according to source, access corresponding from database.
Further, described method also comprises:
Step 4, change when operation when carrying out additions and deletions, additions and deletions are changed to data and are inserted into the head of buffer memory chained list;In the time carrying out query manipulation, data query is moved on to the head of buffer memory chained list; In the time that buffer memory chained list is full,Start to delete from the data of the afterbody of buffer memory chained list.
Tool of the present invention has the following advantages:
1,, by depositing conventional data in buffer memory, during for Data Update and inquiry, use Ke Yi greatReduce greatly the access to MDL, reduce the pressure of database;
2, in the time carrying out data query, preferentially choose buffer memory in data, can ensure that data are latest data,Avoid the nonsynchronous problem of data;
3, regularly remove data cached, reduce memory pressure, improve access efficiency.
Brief description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the logic diagram of a kind of master-slave database synchro system of the present invention.
Fig. 2 is the flowchart of a kind of master-slave database synchronous method of the present invention.
Detailed description of the invention
As shown in Figure 1, a kind of master-slave database synchro system, comprises buffer memory creation module, blocker mouldPiece, configuration module and database access module;
Described buffer memory creation module, writes buffer memory chain for obtaining the frequent tables of data using of MDLIn table;
Described blocker module, for creating blocker, is realizing service logic by described blockerBefore service method, realize the Discern and judge of database source to be visited, described service method comprises increasingRevise the method for operation and the method for query manipulation; Described blocker module is specially: for creating interceptionDevice, defines a thread local variable, and the notification type of described blocker is preposition notice, described threadLocal variable is for storing the title of data source, and the default value of described thread local variable is MDLData source, in the time realizing service logic service method, sentence by the value of described thread local variableDisconnected database source to be visited;
Described configuration module, for creating an engineering, in described engineering xml file, configure MDL,From database and blocker;
Described database access module, for realizing the service method of service logic, if described serviceMethod is to do additions and deletions to change operation, writes in buffer memory chained list when data being write to MDL, synchronousMDL data are to from database; If described service method is to do query manipulation, judgement is slowDeposit in chained list whether have desired data, if so, directly from buffer memory chained list, read, otherwise, to fromIn database, read; Described database access module is specially: for realizing the service of service logicMethod, judges whether service method is that additions and deletions change method of operating, if so, removes described thread officeThe value of portion's variable, makes in the time of Dynamic Acquisition data source, and default access MDL, writes data to become owner ofWhen database, write in buffer memory chained list, more synchronous MDL data are to from database; If described inService method is to do query manipulation, in described thread local variable, puts into one from database nameThe value claiming, first judges in buffer memory chained list whether have desired data, if so, directly from buffer memory chained listIn read, otherwise, in the time of Dynamic Acquisition data source, access corresponding from database.
Described system also comprises caching management module: in the time that execution additions and deletions change operation, additions and deletions are changed to numberAccording to the head that is inserted into buffer memory chained list; When carrying out when query manipulation, data query is moved on to buffer memory chained listHead; In the time that buffer memory chained list is full, start to delete from the data of the afterbody of buffer memory chained list.
As shown in Figure 2, a kind of master-slave database synchronous method, comprises the steps:
Step 1, obtain in MDL the frequent tables of data using and write in buffer memory chained list;
Step 2, create blocker, by described blocker realizing before service logic service methodRealize the Discern and judge of database source to be visited, described service method comprises that additions and deletions change the side of operationThe method of method and query manipulation, described step 2 is specially: create blocker, define a thread localVariable, the notification type of described blocker is preposition notice, described thread local variable is used for storing dataThe title in source, and the default value of the described thread local variable data source that is MDL, realizing businessWhen logic service method, judge database source to be visited by the value of described thread local variable;
Create an engineering, in described engineering xml file, configure MDL, from database and interceptionDevice;
Step 3, realize the service method of service logic, if described service method is to do additions and deletions to changeOperation, writes when data being write to MDL in buffer memory chained list, and synchronous MDL data arriveFrom database; If described service method is to do query manipulation, judges in buffer memory chained list and whether depositAt desired data, if so, directly from buffer memory chained list, read, otherwise, to reading from database,Described step 3 is specially: realize the service method of service logic, judge that whether service method isAdditions and deletions change method of operating, if so, remove the value of described thread local variable, make at Dynamic Acquisition numberDuring according to source, default access MDL; If described service method is to do query manipulation, describedIn thread local variable, put into a value from database-name, first judge in buffer memory chained list and whether existDesired data if so, directly reads from buffer memory chained list, otherwise, in the time of Dynamic Acquisition data source,Access corresponding from database;
Step 4, change when operation when carrying out additions and deletions, additions and deletions are changed to data and are inserted into the head of buffer memory chained list;In the time carrying out query manipulation, data query is moved on to the head of buffer memory chained list; In the time that buffer memory chained list is full,Start to delete from the data of the afterbody of buffer memory chained list.
Below in conjunction with a specific embodiment, the present invention will be further described:
Create data cachedly, obtain in MDL the frequent tables of data using and write in buffer memory chained list;
Create blocker, define a thread local variable ThreadLocal, the notice of described blockerType is preposition notice, and described thread local variable ThreadLocal is used for storing the title of data source,And the data source that the default value of described thread local variable ThreadLocal is MDL, by describedBlocker is realizing the Discern and judge of realizing database source to be visited before service logic service method,Described service method comprises that additions and deletions change the method for operation and the method for query manipulation;
A newly-built engineering configures two databases of principal and subordinate and blocker in the xml of this project file;
In the time realizing service logic service method, by described thread local variable ThreadLocalValue judge database source to be visited:
If described service method is to do additions and deletions to change operation, remove the value of described thread local variable,Make in the time of Dynamic Acquisition data source, default access MDL, when writing MDL by dataWrite the head of buffer memory chained list, more synchronous MDL data are to from database;
If described service method is to do query manipulation, in described thread local variable, put into oneFrom the value of database-name, first judge in buffer memory chained list whether have desired data, if so, directFrom buffer memory chained list, read, and the head that visit data moves on to buffer memory chained list (is moved by frequently-used dataTo the head of buffer memory chained list), otherwise, in the time of Dynamic Acquisition data source, access corresponding from database.
Thisly realize service logic service method by thread local variable save database-name,Can realize multiple threads and access different databases simultaneously, same such as a thread accesses MDLTime, another thread accesses, from database, improves access efficiency.
The present invention also realizes data cached management, changes when operation when user carries out additions and deletions, and additions and deletions are changedData are inserted into the head of buffer memory chained list; In the time carrying out query manipulation, data query is moved on to buffer memory chained listHead; In the time that buffer memory chained list is full, start to delete from the data of the afterbody of buffer memory chained list, it is fixed to realizePhase is removed buffer memory, reduces memory pressure, improves access efficiency.
Although more than described the specific embodiment of the present invention, be familiar with the technology people of the artMember should be appreciated that our described specific embodiment is illustrative, instead of for to thisThe restriction of bright scope, those of ordinary skill in the art are equivalent what do according to spirit of the present inventionModify and change, all should be encompassed in the scope that claim of the present invention protects.
Claims (10)
1. a master-slave database synchro system, is characterized in that: comprise buffer memory creation module, interceptionDevice module and database access module;
Described buffer memory creation module, writes buffer memory chain for obtaining the frequent tables of data using of MDLIn table;
Described blocker module, for creating blocker, is realizing service logic by described blockerBefore service method, realize the Discern and judge of database source to be visited, described service method comprises increasingRevise the method for operation and the method for query manipulation;
Described database access module, for realizing the service method of service logic, if described serviceMethod is to do additions and deletions to change operation, writes in buffer memory chained list when data being write to MDL, synchronousMDL data are to from database; If described service method is to do query manipulation, judgement is slowDeposit in chained list whether have desired data, if so, directly from buffer memory chained list, read, otherwise, to fromIn database, read.
2. a kind of master-slave database synchro system according to claim 1, is characterized in that: instituteThe system of stating also comprises a configuration module, and for creating an engineering, in described engineering xml file, configuration is mainDatabase, from database and blocker.
3. a kind of master-slave database synchro system according to claim 1, is characterized in that: instituteStating blocker module is specially: for creating blocker, define a thread local variable, described threadLocal variable is for storing the title of data source, and the default value of described thread local variable is MDLData source, in the time realizing service logic service method, sentence by the value of described thread local variableDisconnected database source to be visited.
4. a kind of master-slave database synchro system according to claim 3, is characterized in that: instituteStating database access module is specially: for realizing the service method of service logic, judge serviceWhether method is that additions and deletions change method of operating, if so, removes the value of described thread local variable, makesWhen Dynamic Acquisition data source, default access MDL; If described service method is to do query manipulation,In described thread local variable, put into a value from database-name, first judge in buffer memory chained listWhether there is desired data, if so, directly from buffer memory chained list, read, otherwise, at Dynamic Acquisition numberDuring according to source, access corresponding from database.
5. a kind of master-slave database synchro system according to claim 1, is characterized in that: instituteThe system of stating also comprises caching management module: in the time that execution additions and deletions change operation, additions and deletions are changed to data and insertTo the head of buffer memory chained list; In the time carrying out query manipulation, data query is moved on to the head of buffer memory chained list;In the time that buffer memory chained list is full, start to delete from the data of the afterbody of buffer memory chained list.
6. a master-slave database synchronous method, is characterized in that: comprise the steps:
Step 1, obtain in MDL the frequent tables of data using and write in buffer memory chained list;
Step 2, create blocker, described blocker is realized realizing before service logic service methodThe Discern and judge of database source to be visited, described service method comprise additions and deletions change operation method andThe method of query manipulation;
Step 3, realize the service method of service logic, if described service method is to do additions and deletions to changeOperation, writes when data being write to MDL in buffer memory chained list, and synchronous MDL data arriveFrom database; If described service method is to do query manipulation, judges in buffer memory chained list and whether depositAt desired data, if so, directly from buffer memory chained list, read, otherwise, to reading from database.
7. a kind of master-slave database synchronous method according to claim 6, is characterized in that: instituteState after step 2 and also comprise: create an engineering, in described engineering xml file, configure MDL,From database and blocker.
8. a kind of master-slave database synchronous method according to claim 6, is characterized in that: instituteStating step 2 is specially: create blocker, define a thread local variable, described thread local variableFor storing the title of data source, and the default value of the described thread local variable data that are MDLSource, in the time realizing service logic service method, is judged and is waited to visit by the value of described thread local variableAsk database source.
9. a kind of master-slave database synchronous method according to claim 8, is characterized in that: instituteStating step 3 is specially: realize the service method of service logic, judge whether service method is increasingRevise method of operating, if so, remove the value of described thread local variable, make in Dynamic Acquisition dataWhen in the source, default access MDL; If described service method is to do query manipulation, at described lineIn journey local variable, put into a value from database-name, first judge in buffer memory chained list, whether there is instituteNeed data, if so, directly from buffer memory chained list, read, otherwise, in the time of Dynamic Acquisition data source, visitAsk corresponding to database.
10. a kind of master-slave database synchronous method according to claim 6, is characterized in that: instituteThe method of stating also comprises:
Step 4, change when operation when carrying out additions and deletions, additions and deletions are changed to data and are inserted into the head of buffer memory chained list;In the time carrying out query manipulation, data query is moved on to the head of buffer memory chained list; In the time that buffer memory chained list is full,Start to delete from the data of the afterbody of buffer memory chained list.
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| CN109947780A (en) * | 2017-08-17 | 2019-06-28 | 天津数观科技有限公司 | Method, device and system for updating cache by using agent program |
| CN108052623A (en) * | 2017-12-16 | 2018-05-18 | 沈阳明曦科技有限公司 | The synchronous method and synchronization system of MySQL master-slave databases |
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| CN109507979A (en) * | 2019-01-25 | 2019-03-22 | 四川长虹电器股份有限公司 | The manufacturing execution system and its implementation of multi-plant management |
| CN110727698A (en) * | 2019-09-09 | 2020-01-24 | 上海陆家嘴国际金融资产交易市场股份有限公司 | Database access method and device, computer equipment and storage medium |
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