CN110046170B - Statement execution method, device, equipment and medium based on multi-file management - Google Patents
Statement execution method, device, equipment and medium based on multi-file management Download PDFInfo
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- CN110046170B CN110046170B CN201910322515.6A CN201910322515A CN110046170B CN 110046170 B CN110046170 B CN 110046170B CN 201910322515 A CN201910322515 A CN 201910322515A CN 110046170 B CN110046170 B CN 110046170B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/242—Query formulation
- G06F16/2433—Query languages
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
- G06F16/245—Query processing
- G06F16/2455—Query execution
Abstract
The embodiment of the invention discloses a statement execution method, a statement execution device, statement execution equipment and a statement execution medium based on multi-file management. The method comprises the following steps: acquiring an SQL sentence to be executed; integrating self-generated mapper mapping files with the same namespaces and namespaces in the same attribute with a user-defined mapper mapping file in a logic layer to form a mapping space; executing the SQL statement in a database based on the mapping space. The method provided by the embodiment adopts a multi-file management mechanism, so that the self-generated mapper mapping file can be directly used as a file by other programs, a user does not need to modify the file, and all the self-defined mapper mapping files are self-defined SQL statements, so that the self-defined mapper mapping files are convenient to manage respectively; moreover, the self-generated mapper map file can be automatically updated, and meanwhile, the custom SQL is not covered.
Description
Technical Field
The embodiment of the invention relates to a database technology, in particular to a statement execution method, a statement execution device, statement execution equipment and a statement execution medium based on multi-file management.
Background
mybatis is a persistent layer framework that encapsulates JDBC operations databases. At present, when mybatis is used as an Object Relational Mapping (ORM) framework, a self-contained tool of mybatis can automatically generate a mapper Mapping file corresponding to a table, and the mechanism enables a user to automatically update the mapper Mapping file after performing DDL operation on the table, so that the use is very convenient.
However, the SQL statements in the mapper mapping file generated by mybatis are fixed, and it is inevitable that some custom SQL statements are manually written after the mapper mapping file to implement the required functions. Then, when the mapper mapping file is updated after the table is operated, the SQL statements written manually before are overwritten, which is inconvenient to operate.
Disclosure of Invention
The embodiment of the invention provides a statement execution method, device, equipment and medium for multi-file management, which are used for managing a mapper mapping file in a multi-file form.
In a first aspect, an embodiment of the present invention provides a statement execution method based on multi-file management, including:
acquiring an SQL sentence to be executed;
integrating self-generated mapper mapping files with the same namespaces and namespaces in the same attribute with a user-defined mapper mapping file in a logic layer to form a mapping space;
executing the SQL statement in a database based on the mapping space.
In a second aspect, an embodiment of the present invention further provides a statement executing apparatus based on multi-file management, where the apparatus includes:
the acquisition module is used for acquiring SQL sentences to be executed;
the integration module is used for integrating the self-generated mapper mapping file and the self-defined mapper mapping file with the same namespaces and namespaces in the logic layer to form a mapping space;
and the execution module is used for executing the SQL statement in a database based on the mapping space.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:
one or more processors;
a memory for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors implement the multi-file management based statement execution method of any embodiment.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the statement execution method based on multi-file management according to any embodiment.
According to the technical scheme of the embodiment, a self-generated mapper mapping file and a self-defined mapper mapping file with the same namespaces namespace attributes are integrated in a logic layer to form a mapping space, and the SQL statements are executed in a database based on the mapping space, so that multi-file management is performed on the self-generated fixed SQL statements and the self-defined SQL, namely the fixed SQL statements are managed in the self-generated mapper mapping file, and the self-defined SQL is managed in the self-defined mapper mapping file; moreover, when the subsequent file is updated, the self-generated mapper mapping file can be automatically updated, and meanwhile, the self-defined SQL is not covered.
Drawings
Fig. 1 is a flowchart of a statement execution method based on multi-file management according to an embodiment of the present invention;
fig. 2 is a flowchart of a statement execution method based on multi-file management according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a statement execution device based on multi-file management according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a statement execution method based on multi-file management according to an embodiment of the present invention, which is applicable to a mybatis framework and is suitable for a case where a mapper-mapped file is used to execute an SQL statement when the mybatis framework is used as an ORM framework. The method may be performed by a multi-file management based statement execution apparatus, which may be constituted by hardware and/or software and is generally integrated in an electronic device. With reference to fig. 1, the method provided in this embodiment specifically includes the following operations:
and S110, acquiring the SQL statement to be executed.
mybatis is a persistent layer framework that supports normal SQL queries, stored procedures and advanced mapping. mybatis eliminates the manual setting of almost all JDBC code and parameters and retrieval of the result set, mapping interfaces and Java generic Java Objects (POJOs) into records in a database using simple XML or annotations for configuration and raw mapping.
And the user inputs the SQL sentences to be executed to the mybatis framework, and the mybatis framework maps the obtained SQL sentences to corresponding entities in the database so as to execute the SQL sentences through the database.
S120, integrating the self-generated mapper mapping file and the self-defined mapper mapping file with the same namespace attribute in a logic layer to form a mapping space.
In this embodiment, when the mybatis frame is used as the ORM mapping frame, a tool carried by the mybatis frame may help to generate the domain and mapper mapping files corresponding to the table. For convenience of description and distinction, such a mapper map file generated by mybatis self-contained tool is referred to as a self-generated mapper map file.
Because the SQL sentences in the self-generated mapper mapping file are fixed, in order to realize more flexible mapping, a user can create a custom mapper mapping file in the mybatis framework and write some custom SQL sentences in the custom mapper mapping file, and the number of the custom mapper mapping files is at least one. It is worth noting that the custom mapper map file is created and written by the user and not generated by the mybatis own tools. Therefore, when the mapping file is updated subsequently, only the self-generated mapper mapping file is automatically updated based on the automatic updating mechanism of the mybatis self-contained tool, and the self-defined mapper mapping file is not automatically updated.
The self-generated mapper map file has the same namespace (namespace) attributes as the custom mapper map file. In one aspect, the root node of the Map file is < sqlMap >, and namespace is the namespace for that < sqlMap >, because there may be multiple SQL Map Map files, and for SQL Map all Map files are global. This means that the identifier in SQL Map is only unique, and the distinction between mapper mapped files can be made by using namespace and the full qualified name of the identifier. On the other hand, in mybatis, namespace in the mapper map file is used for binding the Dao interface, i.e. interface-oriented programming. After the interface is bound by namespace, the class can be realized without a writing interface, and mybatis can automatically find the SQL statement to be executed correspondingly through the binding.
In one example, the self-generating mapper map file comprises: < mapper namespace ═ com. Accordingly, the custom mapper map file comprises: < mapper namespace ═ com.
Based on the above analysis, the two mapper mapping files with the same namespace attribute have no difference in the logic level. The mybatis framework can integrate two mapper mapping files with the same namespace attribute in a logic layer by searching the namespace attribute to form a mapping space. That is, in the process of executing the SQL statement, two mapper mapping files are regarded as one file to call the SQL statement in the same Dao interface, which are not logically separated from each other.
In a specific implementation, the mapping file takes < mapper > as a root node, and the custom mapper mapping file and the self-generated mapper mapping file need to be added to the < mappers > element configuration.
S130, executing the SQL statement in a database based on the mapping space.
Specifically, SQL for operating the database is defined in the mapping space, and each SQL is a state. And mapping the SQL sentences to be executed based on the mapping space to call corresponding methods in the Dao interface, and executing the SQL sentences in the database according to the called methods.
Further, after S130, the method further includes: and automatically updating the self-generated mapper mapping file, and not automatically updating the self-defined mapper mapping file.
Alternatively, the SQL statement is a database schema Definition Language (DDL), such as creating a database, creating a database table, modifying a database table, deleting a database table, and the like. The DDL statement may cause the field in the database to change, and it is necessary to update the relevant field in the self-generated mapper mapping file after the DDL statement is executed; however, the SQL statements in the custom mapper map file are not updated to preserve the original SQL statements written by the user.
In the embodiment of the invention, a self-generated mapper mapping file and a self-defined mapper mapping file with the same namespaces namespace attribute are integrated in a logic layer to form a mapping space, and the SQL sentences are executed in a database based on the mapping space, so that multi-file management is performed on the self-generated fixed SQL sentences and the self-defined SQL, namely the fixed SQL sentences are managed in the self-generated mapper mapping file, and the self-defined SQL is managed in the self-defined mapper mapping file; moreover, when the subsequent file is updated, the self-generated mapper mapping file can be automatically updated, and meanwhile, the self-defined SQL is not covered.
Example two
Fig. 2 is a flowchart of a statement execution method based on multi-file management according to a second embodiment of the present invention. The embodiment defines the integration process of the self-generated mapper mapping file and the custom mapper mapping file. Specifically, the method provided by the embodiment includes the following operations:
s210, obtaining the SQL statement to be executed.
S220, searching the namespace attribute corresponding to the mybatis framework.
Specifically, by fully qualifying a name or short name, the namespace attribute is looked up.
In an alternative embodiment, the mybatis framework is fused to a spring framework. The method comprises the steps that the spring is a container frame of lightweight control inversion (IoC) and an orientation tangent plane (AOP), dynamic proxy is achieved based on the spring frame, namespace attributes corresponding to the mybatis frame are searched through the dynamic proxy, and the namespace attributes are transmitted to the mybatis frame. The mybatis framework then proceeds to perform S230 and S240.
Specifically, a Mapper interface (equivalent to a Dao interface) is written in advance, a Dao implementation class does not need to be written, a spring framework creates a dynamic proxy object of the Mapper interface according to the definition of the Mapper interface, and a method body of the proxy object and a method of the Dao interface implementation class are defined; and then searching the namespace attribute corresponding to the mybatis framework through the dynamic proxy object. The Mapper interface needs to meet the following conditions: the namespace in the self-generated Mapper mapping file and the custom Mapper mapping file is the same as the class path of the Mapper interface. The name of the Mapper interface method is the same as the id of each status defined in the self-generated Mapper mapping file and the custom Mapper mapping file respectively. The input parameter type of the Mapper interface method is the same as the type of parameterType of each SQL defined in the self-generated Mapper mapping file and the custom Mapper mapping file respectively. The output parameter type of the Mapper interface method is respectively the same as the type of the resultType of each SQL defined in the self-generated Mapper mapping file and the self-defined Mapper mapping file.
And S230, integrating the self-generated mapper mapping file and the self-defined mapper mapping file isolated by the physical layer in the logic layer according to the found namespace attribute to form a mapping space.
And S240, executing the SQL statement in a database based on the mapping space.
In the embodiment, the namespace attribute corresponding to the mybatis framework is searched by adopting a dynamic proxy mode, so that only an interface is required to be written, a realization class is not required to be written, and the operation is simplified; moreover, through dynamic proxy, the searching process is not influenced by the mapper mapping file, the proxy logic and the service logic are independent, and the proxy logic and the service logic are not influenced, invaded and coupled.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a statement execution device based on multi-file management according to a third embodiment of the present invention, as shown in fig. 3, including: an acquisition module 31, an integration module 32 and an execution module 33.
An obtaining module 31, configured to obtain an SQL statement to be executed;
the integration module 32 is used for integrating the self-generated mapper mapping file and the self-defined mapper mapping file with the same namespace attributes in the name space to form a mapping space;
and the execution module 33 is configured to execute the SQL statement in the database based on the mapping space.
In the embodiment of the invention, a self-generated mapper mapping file and a self-defined mapper mapping file with the same namespaces namespace attribute are integrated in a logic layer to form a mapping space, and the SQL sentences are executed in a database based on the mapping space, so that multi-file management is performed on the self-generated fixed SQL sentences and the self-defined SQL, namely the fixed SQL sentences are managed in the self-generated mapper mapping file, and the self-defined SQL is managed in the self-defined mapper mapping file; moreover, when the subsequent file is updated, the self-generated mapper mapping file can be automatically updated, and meanwhile, the self-defined SQL is not covered.
Optionally, the apparatus further includes an automatic update module, configured to automatically update the self-generated mapper map file after executing the SQL statement in the database based on the mapping space, and not automatically update the self-defined mapper map file.
Optionally, the SQL statement defines the language DDL for the database schema.
Optionally, when the integration module 32 integrates the self-generated mapper mapping file and the custom mapper mapping file with the same namespace attribute in the logic layer to form a mapping space, the integration module is specifically configured to: searching a namespace attribute corresponding to the mybatis framework; and integrating the self-generated mapper mapping file and the user-defined mapper mapping file isolated by the physical layer in the logic layer according to the found namespace attribute to form a mapping space.
Alternatively, the mybatis framework is fused to a spring framework. When searching for the namespace attribute corresponding to the mybatis framework, the integration module 32 is specifically configured to: and searching the namespace attribute corresponding to the mybatis framework through the dynamic proxy of the spring framework, and transmitting the namespace attribute to the mybatis framework.
Optionally, when searching for the namespace attribute corresponding to the mybatis framework through the dynamic proxy of the spring framework, the integrating module 32 is specifically configured to: creating a dynamic proxy object of the Mapper interface according to the Mapper interface definition through a spring framework; and searching the namespace attribute corresponding to the mybatis framework through the dynamic proxy object.
The statement execution device based on multi-file management provided by this embodiment can execute the statement execution method based on multi-file management provided by any of the above embodiments, and has the technical effects corresponding to the corresponding methods.
Example four
Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention, as shown in fig. 4, the electronic device includes a processor 40, a memory 41; the number of the processors 40 in the server may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40 and the memory 41 in the server may be connected by a bus or other means, and fig. 4 illustrates the connection by the bus as an example.
The memory 41 serves as a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the multi-file management-based statement execution method in the embodiment of the present invention (for example, the obtaining module 31, the integrating module 32, and the executing module 33 in the multi-file management-based statement executing apparatus). The processor 40 executes various functional applications of the server and data processing, that is, implements the above-described sentence execution method based on multi-file management, by executing software programs, instructions, and modules stored in the memory 41.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to a server over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
EXAMPLE five
An embodiment of the present invention also provides a computer-readable storage medium having a computer program stored thereon, where the computer program is used for executing a statement execution method based on multi-file management when executed by a computer processor, and the method includes:
acquiring an SQL sentence to be executed;
integrating self-generated mapper mapping files with the same namespaces and namespaces in the same attribute with a user-defined mapper mapping file in a logic layer to form a mapping space;
executing the SQL statement in a database based on the mapping space.
Of course, the computer program provided by the embodiment of the present invention is not limited to the above method operations, and may also perform related operations in the multi-file management based statement execution method provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods of the embodiments of the present invention.
It should be noted that, in the embodiment of the statement execution device based on multi-file management, the included units and modules are only divided according to the functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A statement execution method based on multi-file management is applied to a mybatis framework, and comprises the following steps:
acquiring an SQL sentence to be executed;
integrating self-generated mapper mapping files with the same namespaces and namespaces in the same attribute with a user-defined mapper mapping file in a logic layer to form a mapping space;
the self-generated mapper mapping file and the user-defined mapper mapping file with the same namespace attribute are integrated in a logic layer to form a mapping space, and the method comprises the following steps:
searching a namespace attribute corresponding to the mybatis framework;
integrating the self-generated mapper mapping file and the user-defined mapper mapping file isolated by the physical layer in the logic layer according to the found namespace attribute to form a mapping space;
executing the SQL statement in a database based on the mapping space.
2. The method of claim 1, further comprising, after executing the SQL statement in a database based on the mapping space:
and automatically updating the self-generated mapper mapping file, and not automatically updating the self-defined mapper mapping file.
3. The method of claim 1, wherein the SQL statement is a database schema definition language, DDL.
4. The method of claim 1, wherein the mybatis framework is fused to a spring framework;
the searching for the namespace attribute corresponding to the mybatis framework comprises the following steps:
and searching the namespace attribute corresponding to the mybatis framework through the dynamic proxy of the spring framework, and transmitting the namespace attribute to the mybatis framework.
5. The method of claim 4, wherein the looking up the namespace attribute corresponding to mybatis framework by the dynamic proxy of the spring framework comprises:
creating a dynamic proxy object of the Mapper interface according to the Mapper interface definition through a spring framework;
and searching the namespace attribute corresponding to the mybatis framework through the dynamic proxy object.
6. A sentence executing apparatus based on multi-file management, comprising:
the acquisition module is used for acquiring SQL sentences to be executed;
the integration module is used for integrating the self-generated mapper mapping file and the self-defined mapper mapping file with the same namespaces and namespaces in the logic layer to form a mapping space;
the integration module is further configured to:
searching a namespace attribute corresponding to the mybatis framework;
integrating the self-generated mapper mapping file and the user-defined mapper mapping file isolated by the physical layer in the logic layer according to the found namespace attribute to form a mapping space;
and the execution module is used for executing the SQL statement in a database based on the mapping space.
7. The apparatus of claim 6, further comprising:
and the updating module is used for automatically updating the self-generated mapper mapping file and not automatically updating the self-defined mapper mapping file.
8. An electronic device, characterized in that the electronic device comprises:
one or more processors;
a memory for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement a multi-file management based statement execution method as claimed in any one of claims 1-5.
9. A computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing a multi-file management based statement execution method according to any one of claims 1 to 5.
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| CN111797073A (en) * | 2019-11-26 | 2020-10-20 | 北京京东尚科信息技术有限公司 | Database management method, electronic device, and computer-readable storage medium |
| CN111259067B (en) * | 2020-01-21 | 2023-06-06 | 褚晶晶 | Method, device and equipment for realizing DAO interface based on Spring |
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