CN102566990A - Method and device for performing data manipulation in Java application - Google Patents

Method and device for performing data manipulation in Java application Download PDF

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Publication number
CN102566990A
CN102566990A CN2010105933134A CN201010593313A CN102566990A CN 102566990 A CN102566990 A CN 102566990A CN 2010105933134 A CN2010105933134 A CN 2010105933134A CN 201010593313 A CN201010593313 A CN 201010593313A CN 102566990 A CN102566990 A CN 102566990A
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data
structural information
class file
field object
data access
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CN2010105933134A
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CN102566990B (en
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崔杰
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Peking University Founder Group Co Ltd
Beijing Founder Electronics Co Ltd
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Peking University Founder Group Co Ltd
Beijing Founder Electronics Co Ltd
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Abstract

The invention discloses a method and a device for performing data manipulation in Java application, wherein the method and the device are used for mapping a data table into a source code form and improving the efficiency and the accuracy of object-relational mapping. The method comprises the following steps of: obtaining structure information of at least one table from a database; mapping the structure information of the at least one table into a domain object class file and a data access class file; while receiving a data manipulation instruction, performing data manipulation on the domain object class file based on a function in the data access class file. The method can map the data table into source codes, and can improve the efficiency and the accuracy of the object-relational mapping. And the invention also discloses a device for performing data manipulation in Java application.

Description

A kind of method and device that in Java uses, carries out data manipulation
Technical field
The present invention relates to computer realm, relate in particular to a kind of method and device that in Java uses, carries out data manipulation.
Background technology
In project development process based on Java; Need the frequent operation that database is increased, deletes, revises, inquires about; (Java Database Connectivity, when JDBC) connecting database, what the developer faced all is the raw data set and adopting the connection of Java database.In the service logic performance history, the developer needs the structural information according to correlation table in the database of knowing in advance, from database, obtains the data that need, and the workload that this has just increased the developer has reduced development efficiency.
In order to address this problem; Need carry out Object Relation Mapping, so-called Object Relation Mapping promptly is to be object with the data map in the database, and this has just introduced DAO (Data Access Object; DAO) pattern, DAO is a kind of implementation of Object Relation Mapping.The DAO pattern is through encapsulating bottom data, and for operation layer provides an OO interface, the entity that makes the service logic developer can be absorbed in the service-oriented is encoded; Make service logic more clear, the DAO pattern is the combination of data access class Data Accessor and field object class Domain Object, wherein; Data Accessor is that the realization mechanism with data access encapsulates; Be separated with the use code of data, from the outside, Data Accessor provides the data access interface of black box formula; And Domain Object is each data object that relates in the field, and the sealing to object in institute's domain-oriented is provided.
Though can realize separating of service logic and data logic, realizing reaching balance preferably on complicacy and the clear in structure property, normally a table in object correspondence database through the DAO pattern; A plurality of attributes in the object are a plurality of fields of correspondence table respectively, in the performance history of reality to the DAO pattern, need manually the table in the database to be converted into the object of DAO pattern; As need a plurality of tables in the process database; Then need convert corresponding object respectively into, make development efficiency lower to a plurality of tables, and owing to manually the table in the data block is converted into the object of DAO pattern; Feasible stability is not high, is prone to make mistakes.
Summary of the invention
The present invention provides a kind of method and device that in Java uses, carries out data manipulation, in order to tables of data is mapped as the source code form, improves the efficient and the accuracy rate of Object Relation Mapping.
The concrete technical scheme that the embodiment of the invention provides is following:
A kind of method of in Java uses, carrying out data manipulation comprises:
From database, obtain the structural information of at least one table;
The structural information of said at least one table is mapped as field object class file and data access class file;
When receiving the data manipulation indication, the function that comprises based on said data access class file carries out data manipulation to said field object class file.
A kind of device that in Java uses, carries out data manipulation comprises:
First processing unit is used for obtaining from database the structural information of at least one table;
Second processing unit is used for the structural information of said at least one table is mapped as field object class file and data access class file;
The 3rd processing unit is used for when receiving the data manipulation indication, and the function that comprises based on said data access class file carries out data manipulation to said field object class file.
Based on technique scheme, after setting up the database connection, from database, obtain the structural information of table; The structural information of table is mapped as field object class file and data access class file; Thereby can the structural information of showing in the database be mapped as the field object class file, the Structure Conversion that is about to table is the form of source code, will be mapped as the data access class file to the data manipulation of showing in the database; To convert the form of source code to the data manipulation of table into; When receiving the data manipulation indication, the function that comprises based on the database access class file carries out data manipulation to the field object class file, thereby can obtain the record in the table automatically; And need not the raw data in the artificial reading database, thereby the efficient and the accuracy rate of Object Relation Mapping have been improved.
Description of drawings
Fig. 1 carries out data manipulation for the present invention in Java uses method flow diagram;
Fig. 2 carries out data manipulation for the present invention in Java uses structure drawing of device.
Embodiment
For efficient and the accuracy rate that improves Object Relation Mapping, the embodiment of the invention provides a kind of method and device that in Java uses, carries out data manipulation, can improve the efficient of Object Relation Mapping, and improves accuracy rate.This method is: the structural information of from database, obtaining at least one table; The structural information of this at least one table is mapped as field object class file and data access class file; When receiving the data manipulation indication, the function that comprises based on the data access class file carries out data manipulation to the field object class file.
Below in conjunction with accompanying drawing the preferred embodiment of the invention is elaborated.
Consult shown in the accompanying drawing 1, in the embodiment of the invention, the concrete grammar flow process of in Java uses, carrying out data manipulation is following:
Step 101: the structural information of from database, obtaining at least one table.
In Java uses; Can carry out database through Java database connected mode and connect, promptly set up database and connect through database connection object (Connection object), and after setting up the database connection; From database, obtain the whole synthesis information object of database; The structural information that comprises all tables in the database in this whole synthesis information object in the embodiment of the invention, is obtained the structural information of at least one table from the whole synthesis information object of database.
Wherein, the structural information of a table comprises the field title of a table at least, the data type of field, and whether field precision and field are empty.
In the embodiment of the invention, when obtaining the structural information of at least one table, at first obtain the major key of this table,, then finish if there is not major key in this table.The major key of table is meant the unique identification field that writes down in the table, and the major key of table can not repeat, and can not be null value.
Step 102: the structural information of at least one table is mapped as field object class file and data access class file.
Wherein, When the structural information with at least one table is mapped as the field object class file; To at least one table definition field object class, and in this field object class, preset and obtain data and the external interface that data are set, the structural information of table is mapped as the private data of field object class.
When the structural information with at least one table is mapped as the data access class file,, generate the function that the data access class comprises based on the structural information of this at least one table to above-mentioned at least one table definition data access class.The function that this data access class comprises comprises increase function, deletion function, modification function and the query function of data at least.
A corresponding field object class file of table and a data access classes file can be to the structural informations of all or part of table in the database.
After generating field object class file and data access class file, the field object class file and the data access class file that generate are saved to assigned address, directly to call from this assigned address.
Step 103: when receiving the data manipulation indication, the function that comprises based on the database access class file carries out data manipulation to the field object class file.
Below to being that the process of field object file and data access class file is elaborated in the step 102 with the information mapping of at least one table.
Wherein, When the structural information with at least one table is mapped as the field object file,, comprise the naming rule of field of definition object class at first to this at least one table predetermined domain object class; Field object class private data member's naming rule; The data type mapping ruler, constructed fuction, and obtain data and the external interface that data are set; Again the structural information of table is mapped as the private data of field object class.
Example 1, the naming rule of field object class is set to: as shown in table 1, the title of field object class is consistent with the title of corresponding table; And first letter capitalization; The alphabetical small letter of back when in the title of table, underscore being arranged, is removed underscore in the title of corresponding field object class; With first letter capitalization of underscore back, and the alphabetical small letter of back.
Table 1
The title of table The title of field object class
APP_USER、app_user AppUser
APPUSER、appuser Appuser
Example 2, when the field mappings that comprises in the structural information with table was the private data of field object class, the naming rule of employing was provided with as follows: consult shown in the table 2; The private data title of field object class is consistent with field title in the list structure information, and all alphabetical small letters, when in the field title, underscore being arranged; When converting the private data title of field object class into; With in the corresponding private data title underscore being removed, and first letter capitalization of underscore back, the subsequent character small letter.
Table 2
Field title in the table The private data title of field object
USER_NAME、user_name userName
USERNAME、username username
Example 3; The data type mapping ruler of field object class is set to: in Java uses; Can obtain the data type of certain field of table through the getColumnType function in the whole synthesis information object; Whether whether certain field of knowing table through the isNullable function is null value, be null value determination data type mapping ruler according to the data type and the field of field, specifically referring to shown in the table 3.When the structure mapping with table is the private data member of field object class, can shine upon according to the rule in the table 3.
Table 3
Figure BSA00000389487500051
Example 4, to the Table A PP_ROLE in the database, the structural information that adopts the method in the embodiment of the invention to show is mapped as field object, and the structural information of Table A PP_ROLE is as shown in table 4.
Table 4
The field title Field data types Whether can be null value Explanation
ID number no Unique identification (major key)
NAME Varchar2(80) yes Role's title
DESCRIPTION Varchar2(255) yes The role describes
GUID char(36) yes GUID
CREATEDDATE timestamp(6) yes Date created
MODIFIEDDATE timestamp(6) yes Revise the date
READONLY char(1) yes Whether read-only
DISPLAYNAME Varchar2(255) yes Role's display Name
?COORDINATORID number yes Role consistency people's ID
?SHUXING2 Number(10) yes Judgement symbol
?SORTORDER integer yes Sequencing numbers
Adopt the method for the embodiment of the invention, and the rule that is provided with of above-mentioned routine 1-example 3, the structural information of above-mentioned Table A PP_ROLE is mapped as the field object class, this field object class is as follows:
Public class AppRole implementsjava.io.Serializable //AppRole is title { constructing definitions function, the code section omission of the field object class of mapping
Private long id; // according to the private data of the structural information mapping of table
private?String?name;
The structural information of table is mapped as private data, and code omits
To each private data the external interface that obtains data and data are set is set respectively, code omits.
}
Wherein, When the structural information with at least one table is mapped as the data access class file; To above-mentioned at least one table definition data access class, generate the function that the data access class comprises based on the structural information of this at least one table, generate SQL (the Structured Query Language that carries out data manipulation automatically through function; SQL), realize data manipulation.
Example 5; The naming rule of data access class is set to add that by the title of corresponding field object class Dao forms; To the Table A PP_ROLE in the database; Consult shown in the table 4, adopt the method in the embodiment of the invention that the structural information of showing is mapped as DAO, this data access class object is as follows:
Public class AppRoleDao extends BaseDao // with the corresponding data access class of field object class AppRole AppRoleDao
{
Public final static String TABLE_NAME=" APP_ROLE "; //APP_ROLE is the title of table
The constructing definitions function comprises parameterless constructed fuction and the constructed fuction of being with database connection object, and code section omits
Public AppRole getAppRole (ResultSet rs) throws SQLException//for each private data in the field object is provided with concrete data, and return
{
AppRole?obj=new?AppRole();
Obj.setId (rs.getLong (" ID ")); // data of ID are set
Obj.setName (rs.getString (" NAME ")); // data of NAME are set
Each private data is carried out identical operations, after completion is set, return this object, specific code omits
}
Public AppRole getAppRole (long id) throws SQLException//obtain in the table and the corresponding record of major key id through major key, and return the field object corresponding with major key, realize data query
{ initialization definitions is omitted
Sql=" select*from "+TABLE_NAME+ " where ID="+id+ " "; The generated query SQL statement obtains with the corresponding field object of id and returns through carrying out this SQL statement
}
Public void insert (AppRole obj) throws Exception//with the AppRole field object realizes increasing the data recorded operation with inserted mode as parameter
Original definition, and of the same name in order to prevent the key word in field name and the database, definition character string variable P in original definition, and in P, preserve the Database field modifier that obtains, like double quotation marks, specific code is slightly
String sql=" insert into "+TABLE_NAME+" ("+P+ " ID "+P+ ", "+P+ " NAME "+P+ ", "+P+ " DESCRIPTION "+P+ ", "+P+ " GUID "+P+ ", "+P+ " CREATEDDATE "+P+ ", "+P+ " MODIFIEDDATE "+P+ "; " + P+ " READONLY "+P+ ", "+P+ " DISPLAYNAME "+P+ ", "+P+ " COORDINATORID "+P+ ", "+P+ " SHUXING2 "+P+ ", "+P+ " SORTORDER "+P+ ") values (?;?,?,?,?;?,?,?,?,?) "; // generate and insert SQL statement, this SQL statement is: insert into table name (" ID ", " NAME ", " DESCRIPTION ", " GUID ", " CREATEDDATE "; " MODIFIEDDATE ", " READONLY ", " DISPLAYNAME ", " COORDINATORID ", " SHUXING2 ", " SORTORDER ") values (?;?,?,?,?;?,?,?,?,?)
The concrete data of each private data that obtains are successively carried out assignment to the field in the SQL statement successively, realize that inserted mode increases the data recorded operation
}
Public void update (AppRole obj) throws Exception//AppRole field object realizes upgrading the data recorded operation as parameter
{
Original definition, of the same name in order to prevent the key word in field name and the database, definition character string variable P in original definition, and in P, preserve the Database field modifier that obtains, like double quotation marks, specific code is slightly
String sql=" update "+TABLE_NAME+ " set "+P+ " NAME "+P+ "=?; " + P+ " DESCRIPTION "+P+ "=?, "+P+ " GUID "+P+ "=?, "+P+ " CREATEDDATE "+P+ "=?; " + P+ " MODIFIE DDATE "+P+ "=?; " + P+ " READONLY "+P+ "=?, "+P+ " DISPLAYNAME "+P+ "=?, "+P+ " COORDIN ATORID "+P+ "=?; " + P+ " SHUXING2 "+P+ "=?, "+P+ " SORTORDER "+P+ "=? where "+P+ " ID "+P+ "=? " // generate and upgrade SQL statement
The concrete data of each private data that obtains are successively carried out assignment to the field in the SQL statement successively, realize that inserted mode increases the data recorded operation
}
Public void delete (long id) throws SQLException//through in the major key delete list with the corresponding record of major key, realize deletion data operation
{ original definition is omitted
sql=″delete?from″+TABLE_NAME+″where?ID=″+id+″″;
Generate the deletion SQL statement, and carry out deletion based on this SQL statement, specific code slightly
}
}
Based on the said method flow process, consult shown in the accompanying drawing 2, a kind of device that in Java uses, carries out data manipulation also is provided in the embodiment of the invention, mainly form by following processing unit,
First processing unit 201 is used for obtaining from database the structural information of at least one table;
Second processing unit 202 is used for the structural information of above-mentioned at least one table is mapped as field object class file and data access class file;
The 3rd processing unit 203 is used for when receiving the data manipulation indication, and the function that comprises based on the data access class file carries out data manipulation to the field object class file.
Based on technique scheme, in the embodiment of the invention, after setting up the database connection; From database, obtain the structural information of table, the structural information of showing is mapped as field object class file and data access class file, thereby can the structural information of showing in the database be mapped as the field object class file; The Structure Conversion that is about to table is the form of source code; The data access class file will be mapped as to the data manipulation of showing in the database, the form of source code will be converted to the data manipulation of table into, when receiving the data manipulation indication; The function that comprises based on the database access class file carries out data manipulation to the field object class file; Thereby can obtain the record in the table automatically, and need not the raw data in the artificial reading database, thereby improve the efficient and the accuracy rate of Object Relation Mapping.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims (10)

1. a method of in Java uses, carrying out data manipulation is characterized in that, comprising:
From database, obtain the structural information of at least one table;
The structural information of said at least one table is mapped as field object class file and data access class file;
When receiving the data manipulation indication, the function that comprises based on said data access class file carries out data manipulation to said field object class file.
2. the method for claim 1 is characterized in that, from database, obtains the structural information of at least one table, comprising:
Obtain the major key information of said at least one table, if exist, then the structural information with said at least one table is mapped as field object class file and data access class file, is used as the uniquely identified field in the structural information that said major key information is said at least one table.
3. the method for claim 1 is characterized in that, the structural information of said at least one table is mapped as the field object class file, comprising:
To said at least one table definition field object class, and in said field object class, preset and obtain data and the external interface that data are set;
The structural information of table is mapped as the private data of said field object class.
4. the method for claim 1 is characterized in that, the structural information of said at least one table is mapped as the data access class file, comprising:
To said at least one table definition data access class;
Structural information based on said at least one table generates the function that said data access class comprises.
5. method as claimed in claim 4 is characterized in that, the function that said data access class comprises comprises increase function, deletion function, modification function and the query function of data at least.
6. a device that in Java uses, carries out data manipulation is characterized in that, comprising:
First processing unit is used for obtaining from database the structural information of at least one table;
Second processing unit is used for the structural information of said at least one table is mapped as field object class file and data access class file;
The 3rd processing unit is used for when receiving the data manipulation indication, and the function that comprises based on said data access class file carries out data manipulation to said field object class file.
7. device as claimed in claim 6; It is characterized in that; When said first processing unit obtains the structural information of at least one table from database, obtain the major key information of said at least one table, if exist; Then the structural information with said at least one table is mapped as field object class file and data access class file, is used as the uniquely identified field in the structural information that said major key information is said at least one table.
8. device as claimed in claim 6 is characterized in that, said second processing unit is mapped as the field object class file with the structural information of said at least one table, is specially:
To said at least one table definition field object class, and in said field object class, preset and obtain data and the external interface that data are set;
The structural information of table is mapped as the private data of said field object class.
9. device as claimed in claim 6 is characterized in that, said second processing unit is mapped as the data access class file with the structural information of said at least one table, is specially:
To said at least one table definition data access class;
Structural information based on said at least one table generates the function that said data access class comprises.
10. device as claimed in claim 9 is characterized in that, the function that said data access class comprises comprises increase function, deletion function, modification function and the query function of data at least.
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CN103020318A (en) * 2013-01-10 2013-04-03 北京锐安科技有限公司 Method for maintenance of database tables in database
CN103942281A (en) * 2014-04-02 2014-07-23 北京中交兴路车联网科技有限公司 Method and device for operating object persistently stored
CN104199907A (en) * 2014-08-28 2014-12-10 广州华多网络科技有限公司 Data inserting method and device
CN104765596A (en) * 2014-01-08 2015-07-08 腾讯科技(深圳)有限公司 Request handling method and device
CN106126224A (en) * 2016-06-21 2016-11-16 浪潮软件集团有限公司 Tool, system and method for generating program object
CN108388588A (en) * 2018-01-30 2018-08-10 福建星瑞格软件有限公司 The offline read method of database functions and system of sql sentence Auto-Generation Tools
CN109471619A (en) * 2018-11-20 2019-03-15 北京千丁互联科技有限公司 Mybatis code generating method, device and terminal
CN109491649A (en) * 2018-11-20 2019-03-19 北京千丁互联科技有限公司 Dao code generating method and terminal
CN109542453A (en) * 2018-11-20 2019-03-29 北京千丁互联科技有限公司 Database information recognition methods, device and terminal
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

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Publication number Priority date Publication date Assignee Title
CN103020318A (en) * 2013-01-10 2013-04-03 北京锐安科技有限公司 Method for maintenance of database tables in database
CN104765596A (en) * 2014-01-08 2015-07-08 腾讯科技(深圳)有限公司 Request handling method and device
CN103942281A (en) * 2014-04-02 2014-07-23 北京中交兴路车联网科技有限公司 Method and device for operating object persistently stored
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CN104199907A (en) * 2014-08-28 2014-12-10 广州华多网络科技有限公司 Data inserting method and device
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CN106126224A (en) * 2016-06-21 2016-11-16 浪潮软件集团有限公司 Tool, system and method for generating program object
CN108388588A (en) * 2018-01-30 2018-08-10 福建星瑞格软件有限公司 The offline read method of database functions and system of sql sentence Auto-Generation Tools
CN109471619A (en) * 2018-11-20 2019-03-15 北京千丁互联科技有限公司 Mybatis code generating method, device and terminal
CN109491649A (en) * 2018-11-20 2019-03-19 北京千丁互联科技有限公司 Dao code generating method and terminal
CN109542453A (en) * 2018-11-20 2019-03-29 北京千丁互联科技有限公司 Database information recognition methods, device and terminal
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

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