CN106775770B - Search method for constructing query statement based on class information - Google Patents
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Abstract
The invention relates to a searching method for constructing query sentences based on class information, which comprises the following steps: s1, a server side extracts Java class information and attribute information thereof by scanning a persistent class file; reading a preset configuration file, and acquiring default configuration of each attribute; automatically generating a class information data table file according to the Java class information, the attribute information and the configuration information; s2, a user sets service parameters through a client and dynamically adds a text input box; a user inputs query contents through a text input box, and the input query contents and the service parameter I are sent to a server side; and S3, the server receives the query content and the service parameters input through the client, automatically spells out the SQL sentences, performs corresponding database searching operation according to the spliced SQL sentences, and performs information feedback to the client. The method improves the searching speed, can help the user to quickly finish the operation and simplifies the code.
Description
Technical Field
The invention relates to the technical field of database query, in particular to a search method for constructing query sentences based on class information (the class information refers to Java classes corresponding to tables in a database, and the list of the tables is the attribute of the classes).
Background
The Java language is widely applied to various software developments as a relatively mature programming language. In current software development, the development is mainly in a B/S browser mode, the interaction aspect of AJAX local refreshing is the mainstream of application development, and a server generally adopts a data persistence tool, such as JDBCTEMPLATE, HIBERNATE, IBATIS and the like. A typical application framework is JavaScript + Struts + Spring + Hibernate/Ibatis. Meanwhile, in software development, data access is indispensable, and in database technology, the use of SQL statements is the main method for database operation.
In the invention, dynamic addition of foreground page query conditions and automatic splicing of background query statements are integrated, so that a user can complete complex query operation by using simple operation. At present, less dynamic information query methods from background to foreground are comprehensively solved, the technical schemes relating to the aspects of dynamically constructing query statements, automatically completing, automatically prompting and the like are provided, and the application aiming at the aspect of the information is lacked. Therefore, it is necessary to provide a query method for constructing a query statement based on class information, which can automatically generate a class information data table file of a Java object and implement real-time feedback of information.
Disclosure of Invention
In view of the foregoing analysis, the present invention aims to provide a search method for constructing a query statement based on class information, so as to solve the problem that the number of dynamic class information query methods from a background to a foreground in the existing method is small.
The purpose of the invention is mainly realized by the following technical scheme:
the searching method for constructing the query statement based on the class information comprises the following steps:
s1, a server side extracts Java class information and attribute information thereof by scanning a persistent class file; reading a preset configuration file, and acquiring default configuration of each attribute; automatically generating a class information data table file according to the Java class information, the attribute information and the configuration information;
s2, the client receives the service parameters input by the user and dynamically adds a text input box according to the selection of the user; the client receives the query content input by the user through the text input box, and sends the input query content and the first service parameter to the server;
and S3, the server receives the query content and the service parameters which are selected and input through the client, automatically splices SQL sentences, performs database searching operation according to the spliced SQL sentences, and feeds back information to the client.
The step S1 for automatically generating the class information data table file includes the following sub-steps:
creating a Velocity template;
the method comprises the steps of automatically extracting Java class information and attribute information thereof by scanning a persistent class file;
reading a preset configuration file, and acquiring default configuration of attributes;
generating SQL sentences by using the created vector template, writing the information of Java classes and attribute information and configuration information thereof into a data table file by using the SQL sentences, and generating a class information data table file;
and outputting the class information data table file.
Preferably, after the class information table file is generated, the class information table file is updated by editing the Java class or the attribute information and configuration information thereof in the class information table file.
Preferably, in step S2, the text input box may display the corresponding matching entry following the user' S typing.
The method adopts a Java reflection mechanism to realize dynamic addition of the text input box and display of the matched items in the text input box, and comprises the following specific steps:
the client receives the service parameters set by the user;
the client dynamically adds a text input box in a foreground interface according to the input of a user, receives the entry input by the user through the text input box, and sends the received entry and the first service parameter to the server;
the server receives the entries and the service parameters, automatically creates query statements according to the class information data table files and the service parameters, then executes the query statements, and obtains query results as matching entries of the entries input by the user;
the server side constructs the query result into a Json character string and sends the Json character string to the client side;
the client analyzes the character string and displays the matching items for the user to select the query content.
The implementation of step S3 includes the following substeps:
the server receives the service parameters transmitted by the client and the query content selected by the user;
acquiring attribute information and configuration information corresponding to query contents and service parameters according to the class information data table file;
aiming at each query content, obtaining and storing a corresponding SQL statement segment;
merging the SQL statement fragments of the query contents selected by the user into a standard SQL statement and storing the standard SQL statement;
and utilizing the merged SQL statement to perform corresponding database searching operation.
Preferably, the corresponding SQL statement segment is obtained for each query content, specifically, corresponding processing is performed according to the data type of the attribute corresponding to the text box.
The invention has the following beneficial effects:
the server side automatically generates a class information data table of the Java object by scanning the Java class file corresponding to the database table when starting; dynamically adding a text input box in a foreground interface of the client, wherein the input box displays matched items along with the key input of a user; and finally, automatically splicing the SQL sentences by the program background according to the field types, and carrying out corresponding database operation according to the spliced SQL sentences to finish the real-time information feedback.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a flowchart for automatically generating class information data table files for Java classes;
FIG. 2 is a flow diagram of the dynamic addition of text entry boxes and displaying matching entries;
FIG. 3 is a flow chart of automatic concatenation of SQL statements;
FIG. 4 is a diagram of a part of a background handler for implementing automatic concatenation of SQL statements;
FIG. 5 is a diagram of a dynamic text entry box in a client foreground interface.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
The invention discloses a searching method for constructing query statements based on class information, wherein the class information refers to Java classes corresponding to tables in a database, and the columns of the tables are attributes of the classes, and the method specifically comprises the following steps:
s1, a server side extracts information and attribute information of a Java class by scanning a persistent class file; reading a preset configuration file, and acquiring default configuration of attributes; and automatically generating a class information data table file according to the Java class information, the attribute information and the configuration information. This part of the operation is done at the server.
This step further includes sub-steps S11-S15, as shown in FIG. 1.
And S11, creating a Velocity template. The Velocity template is used for realizing common abstraction of SQL sentences. The created Velocity template comprises information such as a full path, an attribute name, an attribute front-end interface display name, a corresponding position of an attribute front end in a front-end page, a width rendering method, whether to display, whether to sort, whether to edit, a sorting sequence number and the like of the Java class. It allows anyone to reference objects defined by Java code simply using a template language.
S12, automatically extracting Java class information and attribute information thereof by scanning the persistent class file, wherein the Java class information comprises the name and the information of the Java class, the name and the attribute data type of each attribute variable in the Java class, the full path of the class corresponding to the attribute, the attribute sequence number and the like; reading a preset configuration file, and acquiring default configuration of the attributes, such as whether the configuration can be sorted, edited, displayed and the like.
The persistent class file refers to a source code, text data, a table and the like which store data attribute information in an application project;
the Java class corresponds to a table in the data air; the Java class information refers to information of the Java class itself, such as name and storage location of the Java class; the attribute information of a Java class may refer to information of attributes included in one Java class, i.e., information of columns, such as names of attribute variables, data types of the attribute variables, sequence numbers of the attribute variables, and the like;
the configuration file refers to the default configuration of each attribute variable in the Java class defined by the user, for example, whether the attribute variables can be sorted, edited, displayed, inquired and the like.
And S13, generating an SQL statement by using the Velocity template created in the step S11, and adding the information of the Java class, the attribute information and the configuration information thereof to the class information data table file by using the SQL statement, so as to automatically generate the class information data table file.
Generating SQL statements such as: insert into tablet column value ($ CLASSFULLNAME, $ COLUMNENUMINAME, $ COLUMNLENGTH, $ COLUMNNAME, $ COLUMNTYPE, $ MINI _ ALIGN, $ MINI _ COLUMNTEXT).
And S14, outputting the class information data table file corresponding to the persistent class file.
And S15, editing the Java class/attribute/configuration information in the class information data table file, and updating the class information data table file. In the invention, the class information data table file is designed to be editable, so that the configuration information finally meeting the requirements of the user can be generated by modifying the default configuration (whether to display, whether to sort, whether to edit or not and sorting sequence number) of the attribute and is updated into the class information data table file, and the configuration meeting the requirements of the user is recorded in the class information data table file.
In step S1, the class information, the attribute information, and the configuration information are automatically extracted, SQL statements for inserting the class information are automatically created based on the Velocity technology, and the class information, the attribute information, and the configuration information (which is equivalent to a kind of meta information) are written into the class information data table file and updated. By the operation, the class information data table file which is configured based on the user and is used for describing the Java class and the attribute thereof and contains the configuration information of the user can be quickly obtained. The automatic creation of the information data table file provides convenience for subsequent development work.
S2, the client receives the service parameters input by the user and dynamically adds a text input box according to the selection of the user; the client receives the query content input by the user through the text input box, and sends the input query content and the service parameter I to the server side.
Preferably, the text entry box displays the corresponding matching entry following the user's typing.
In the embodiment, a Java reflection mechanism is adopted to realize the dynamic addition of the text input box and the display of the matched items. The Java reflection mechanism is that in a running state, all the attributes and methods of any class can be known; for any object, a method of any of the classes can be called. This dynamically acquired information and the function of dynamically invoking objects is called the reflection mechanism of the Java language. The reflection mechanism mainly provides the following functions: judging the class to which any one object belongs at the time of running; objects of any one class are constructed at runtime. By utilizing the reflection mechanism, the development efficiency is higher, and the system maintenance and migration deployment are simpler.
Preferably, the non-refresh prompt function is realized by using an AJAX (asynchronous Javascript And XML) technology of a JS (Javascript) script, or the non-refresh automatic completion And prompt function is realized by using a JQUERY library component, And the technology can help easily add the automatic completion And automatic prompt function of the input box in a website. When a WEB page is used for searching, entries are typed in a text input box of the WEB page, and matched entries can be typed and displayed along with a user, so that the time is saved, and the function is automatically completed. In the WEB page, the automatic completion and prompt functions of the text input box can help the user to complete the operation quickly, and the WEB page is very good in user experience. When an information item is made, for example, when a new business is added, a person needs to be selected, and at this time, if "li" is input in the text input box, a drop-down box automatically appears, and the name of the person with the last name of "li" is displayed. If text continues to be entered in the text entry box, a drop-down box automatically appears to display the name of the person whose name includes "lie".
The specific method for dynamically adding a text input box and displaying a matching entry in the input box by using the reflection mechanism is as follows, and the flow chart is shown in fig. 2.
S21, the client receives service parameters set by a user, wherein the service parameters are a table to be searched and a column (attribute of a Java class object) to be searched during query;
s22, the client dynamically adds a text input box in a foreground interface according to the input of a user, receives entries input by the user through the text input box, and sends the received entries and the first service parameter to the server;
s23, receiving entries and service parameters by the server;
s24, the server side automatically creates query sentences according to the class information data table files and the service parameters;
s25, the server executes the query statement to obtain a query result which is used as a matching item of the user input entry;
s26, the server side constructs the query result into a Json character string which can be analyzed by the client side and sends the Json character string to the client side;
and S27, the client analyzes the character string and displays the matched items so that the user can select the query content.
The dynamic addition of the input box and the automatic matching of the text input box can help a user to quickly complete the input operation of the text box.
And S3, the server receives the query content and the service parameters which are selected and input by the client, automatically splices SQL sentences, performs corresponding database searching operation according to the spliced SQL sentences, and feeds back information to the client.
Specifically, the automatic splicing of the SQL statement is to perform SQL statement processing on the query content input in at least one text input box. Preferably, the SQL statements are first processed for the information of the single text entry box, and then they are combined using the conditional statements.
Preferably, for information processing of a single text input box, corresponding processing can be performed according to the data type of the attribute corresponding to the text box. For example, a character string is input into a text input box, the text input box corresponds to the attribute of the character string type, and the SQL statement creation of the attribute can be performed by adopting a character string matching mode of 'Like'; for the long shaped data, the SQL statement creation of the attribute is performed in a ' or ' no ' numerical comparison manner. An example of the procedure is shown in fig. 4.
Through the automatic splicing of the SQL sentences, errors caused by manual character input errors are reduced, meanwhile, the coding time is saved, and the writing difficulty of programming workers is reduced.
Step S3 specifically includes the following sub-steps, as shown in fig. 3:
s31, the server receives the service parameters transmitted by the client and the query content selected by the user;
s32, sequentially obtaining attribute information and configuration information corresponding to the query content and the service parameters according to the class information data table file; such as data type, queryable, etc.;
s33, acquiring and storing corresponding SQL statement fragments aiming at each query content;
s34, combining the SQL statement fragments of the query contents selected by the user into a standard SQL statement and storing the standard SQL statement;
and S35, utilizing the merged SQL sentences to carry out corresponding database searching operation.
In summary, the embodiments of the present invention provide a method for constructing a query statement based on class information, which can be used for WEB page search. The server side can automatically generate a class information data table file which can describe Java class information, attribute information and configuration information and is equivalent to a meta information data table file, the data table can provide convenience for data query and query splicing of follow-up work, the attribute information and the configuration information in the Java class are not required to be searched in the corresponding Java class every time, and the information and the configuration in the Java class are directly obtained according to the class information data table file, so that data search among different query projects is facilitated, and the search speed is improved. In addition, when the text input box is dynamically added in the foreground interface of the Java program, the input box can display the matched items along with the typing of the user, so that the method can help the user to quickly finish the operation. And finally, automatically splicing the SQL sentences by the program background according to the field types, and performing corresponding database operation according to the spliced SQL sentences to complete information real-time feedback, thereby simplifying codes, reducing input errors and saving coding time.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. A search method for constructing query statements based on class information is characterized by comprising the following steps:
s1, a server side extracts Java class information and attribute information thereof by scanning a persistent class file; reading a preset configuration file, and acquiring default configuration of each attribute; automatically generating a class information data table file according to the Java class information, the attribute information and the configuration information;
s2, the client receives the service parameters input by the user and dynamically adds a text input box according to the selection of the user; the client receives the query content input by the user through the text input box, and sends the input query content and the first service parameter to the server;
s3, the server receives the query content and the service parameters which are selected and input through the client, automatically splices SQL sentences, performs database searching operation according to the spliced SQL sentences, and feeds back information to the client; the method specifically comprises the following steps:
the server receives the service parameters transmitted by the client and the query content selected by the user;
acquiring attribute information and configuration information corresponding to query contents and service parameters according to the class information data table file;
aiming at each query content, obtaining and storing a corresponding SQL statement segment;
merging the SQL statement fragments of the query contents selected by the user into a standard SQL statement and storing the standard SQL statement;
and utilizing the merged SQL statement to perform corresponding database searching operation.
2. The searching method for building query statement based on class information according to claim 1, wherein the step S1 implementing automatic generation of class information data table file comprises the following sub-steps:
creating a Velocity template;
the method comprises the steps of automatically extracting Java class information and attribute information thereof by scanning a persistent class file;
reading a preset configuration file, and acquiring default configuration of attributes;
generating SQL sentences by using the created vector template, writing the information of Java classes and attribute information and configuration information thereof into a data table file by using the SQL sentences, and generating a class information data table file;
and outputting the class information data table file.
3. The method according to claim 1 or 2, wherein after the class information data table file is generated, the class information data table file is updated by editing the Java class or the attribute information and configuration information thereof in the class information data table file.
4. The method of claim 1, wherein the text input box displays the corresponding matching entry following the user's typing.
5. The method of claim 4, wherein the steps of dynamically adding a text input box and displaying the matching entry in the text input box are as follows:
the client receives the service parameters set by the user;
the client dynamically adds a text input box in a foreground interface according to the input of a user, receives the entry input by the user through the text input box, and sends the received entry and the first service parameter to the server;
the server receives the entries and the service parameters, automatically creates query statements according to the class information data table files and the service parameters, then executes the query statements, and obtains query results as matching entries of the entries input by the user;
the server side constructs the query result into a Json character string and sends the Json character string to the client side;
the client analyzes the character string and displays the matching items for the user to select the query content.
6. The method according to claim 4 or 5, wherein a Java reflection mechanism is adopted to dynamically add text input boxes and display matching entries.
7. The method according to claim 1, wherein for each query content, a corresponding SQL statement fragment is obtained, specifically, a corresponding processing is performed according to a data type of an attribute corresponding to the text box.
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| CN107679056B (en) * | 2017-06-25 | 2021-03-02 | 平安科技（深圳）有限公司 | Method for generating SQL (structured query language) statement, electronic device and readable storage medium |
| CN109947788B (en) * | 2017-10-30 | 2021-10-15 | 北京京东尚科信息技术有限公司 | Data query method and device |
| CN110109947A (en) * | 2017-12-28 | 2019-08-09 | 北京京东尚科信息技术有限公司 | The method and apparatus for extracting data |
| CN108446398A (en) * | 2018-03-27 | 2018-08-24 | 北京邦邦共赢网络科技有限公司 | A kind of generation method and device of database |
| CN110555030B (en) * | 2018-03-28 | 2024-06-18 | 北京京东尚科信息技术有限公司 | SQL sentence processing method and device |
| CN110750705A (en) * | 2018-07-06 | 2020-02-04 | 北京高德云图科技有限公司 | Search result display method and device and electronic equipment |
| CN110825389A (en) * | 2018-08-07 | 2020-02-21 | 北京国双科技有限公司 | Json character string generation method and device, storage medium and processor |
| CN109634590A (en) * | 2018-12-28 | 2019-04-16 | 北京神舟航天软件技术有限公司 | A kind of Object Query method based on business model |
| CN109739493A (en) * | 2019-01-18 | 2019-05-10 | 宜创(北京)科技有限公司 | Generation method, device, electronic equipment and the storage medium of data base manipulation statement |
| CN109918394B (en) * | 2019-01-23 | 2023-11-28 | 中国平安人寿保险股份有限公司 | Data query method, system, computer device and computer readable storage medium |
| CN109977139B (en) * | 2019-03-18 | 2022-12-02 | 京东科技控股股份有限公司 | Data processing method and device based on class structured query statement |
| CN109977317B (en) * | 2019-04-03 | 2021-04-27 | 恒生电子股份有限公司 | Data query method and device |
| CN110674141A (en) * | 2019-10-09 | 2020-01-10 | 四川长虹电器股份有限公司 | Method for adding database table to page based on java development |
| CN111966704A (en) * | 2020-07-09 | 2020-11-20 | 杭州传化智能制造科技有限公司 | ORM framework implementation method, system, computer equipment and storage medium |
| CN114756554B (en) * | 2022-06-13 | 2022-09-30 | 中建电子商务有限责任公司 | Data query processing method based on MyBatis framework |
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