Hibernate Getting Started Tutorial

Hibernate is an ORM framework that works with a variety of databases, SQL, and statements, and is a solution for data persistence.

Before we begin our study, we need to prepare our hibernate essential jar first. You can go to the official website to download: http://hibernate.org/orm/

Let's take a look at the first example of Habernate.

Development environment: MyEclipse + mysql5.5.

1. Prepare the database

We first create an employee database EMP, the database contains a table t_emp includes fields with ID, employee name, salary, age 4 fields.

Create an Employee database EMP

Create an employee table T_emp

2. Create a new EMP JavaBean class, the so-called JavaBean refers to only the attributes and the corresponding get and set methods. Our Simple object property fields correspond to the fields in our t_emp table.

1  Public classEMP {2 3     Private intId//ID4     PrivateString name;//name5     PrivateBigDecimal salary;//pay because it is money, so with bigdecimal type, more accurate. 6     Private intAge//Age7 8      PublicEmp () {9 Ten     } One      A      Public intgetId () { -         returnID; -     } the  -      Public voidSetId (intID) { -          This. ID =ID; -     } +  -      PublicString GetName () { +         returnname; A     } at  -      Public voidsetName (String name) { -          This. Name =name; -     } -  -  in      Public voidSetName (String ename) { -          This. Name =ename; to     } +  -      PublicBigDecimal getsalary () { the         returnsalary; *     } $ Panax Notoginseng      Public voidsetsalary (BigDecimal salary) { -          This. Salary =salary; the     } +  A      Public intGetage () { the         returnAge ; +     } -  $      Public voidSetage (intAge ) { $          This. Age =Age ; -     } -  the @Override -      PublicString toString () {Wuyi         return"Emp [age=" + Age + ", id=" + ID + ", name=" +name the+ ", salary=" + salary + "]"; -     } Wu}

2.hibernate Configuration

Create a new XML file in the SRC directory named Hibernate.cfg.xml

1 <!DOCTYPE hibernate-configuration Public2 "-//hibernate/hibernate Configuration DTD 3.0//en"3 "Http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">4 5 <hibernate-configuration>6     <session-factory>7     8     <!--Configure the URL of a link -9     < Propertyname= "Hibernate.connection.url">Ten jdbc:mysql://localhost:3306/emp One         </ Property> A         <!-- - Configure link-driven -          - the         < Propertyname= "Hibernate.connection.driver.class"> - Com.mysql.jdbc.Driver -         </ Property> -         <!-- + Encoding Method -          - +         < Propertyname= "Connection.useunicode">True</ Property> A         < Propertyname= "Connection.characterencoding">UTF-8</ Property> at         <!-- - database user name and password -          - -         < Propertyname= "Hibernate.connection.username">Root</ Property> -         < Propertyname= "Hibernate.connection.password">Root</ Property> -         <!-- in Hiberate parse dialect, different database will be not the same, we use MySQL here -          - to         < Propertyname= "Hibernay.dialect"> + Org.hibernate.dialect.MySQLDialect.class -         </ Property> the         <!-- * Display SQL statements in the console, this is for debugging purposes, project on-line must not add this Oh $          -Panax Notoginseng         < Propertyname= "Hibernate.show_sql">True</ Property> -         < Propertyname= "Hibernate.format_sql">True</ Property> the         <!-- + introduce an EMP employee to this entity class configuration file A          - the         <MappingResource= "Entity/emp.hbm.xml"></Mapping> +     </session-factory> - </hibernate-configuration>

Now let's configure our EMP entity class and t_emp mapping relationship, create a new XML file named Emp.hbm.xml

1 <!DOCTYPE hibernate-mapping Public2 "-//hibernate/hibernate Mapping DTD 3.0//en"3 "Http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">4 <hibernate-mapping>5     <classname= "ORG.TARENA.ENTITY.EMP"Table= "T_emp">6         <IDname= "id"column= "id">7             <!--The primary key generation policy for the database native configured to use the build policy that comes with the database--Reference:http://www.cnblogs.com/yfyzy/p/4675041.html> for detailed parameters8             <Generatorclass= "Native"></Generator>9         </ID>Ten         < Propertyname= "Name"column= "Name" > One         </ Property> A         < Propertyname= "Salary"column= "Salary"> -         </ Property> -         < Propertyname= "Age"column= "Age"> the         </ Property> -     </class> - </hibernate-mapping>

Below is the chart of my Project

Let's talk about it today, and continue tomorrow O (∩_∩) o~

Hibernate Getting Started Tutorial