Introduction to Ibatis by Rohit

1. IBatisGet to know iBatisAuthor: Rohit Prabhakarhttp://rohitprabhakar.com

2. Get to know iBatis from Rohit @ http://rohitprabhakar.comiBatisTopics:Introduction

3. Installation

4. Environment

5. Spring-iBatis Integration

6. SQL Mappings

7. ConclusioniBatis:IntroductioniBATIS is a Data Persistence Framework. iBATIS in other words is an additional layer of indirection between the classes and the tables allowing it in more flexibility in how classes and tables are mapped with out making any changes to the Data model and the Object model. The layer of indirection here is the SQL. This enables mapping SQL queries to POJOs-Plain Old Java Objects. This works like the same as JPA[Hibernate/Spring framework] but faster than that. The main advantages are- 1. Reduces the amount of Java code to access a DataBase with the use of XML files containing SQL queries. 2.Faster than JPA. 3.Uses existing SQL Stored Procedures. Get to know iBatis from Rohit @ http://rohitprabhakar.com

8. iBatis: InstallationiBATISis delivered in a single JAR file: ibatis-version.build.jarand should be copied and made available at runtime via the application's class path.This can be downloaded from iBatis homepage.Get to know iBatis from Rohit @ http://rohitprabhakar.com

9. iBatis:Environment ConfigurationUsing Spring - iBATIS with a stand-alone application:You should place the ibatis-x.x.x.x.jar in the application's classpath.

10. Define and place the following three configuration files in the classpathSpring config - This file defines the database connection parameters, the location of the SQL Map config file, and one or more Spring beans for use within the application. ( applicationContext.xml). SQL Map config - This file defines any iBATIS-specific configuration settings that you may need and declares the location for any SQL Map files that should be accessible through this config file. (SqlMapConfig.xml) SQL Map(s) One or more SQL Map files are declared in the SQL Map config and typically mapped to a single business entity within the application ,often represented by a single Java class (domainObject.xml). Using Spring - iBATIS with a web applicationSame as the above ,but just need one more xml (web.xml).Get to know iBatis from Rohit @ http://rohitprabhakar.com

11. Spring-iBatis IntegrationAdd to the iBatis jar to the project classpath

12. Create a package “com.test.ibatis”

13. Create a class “Student “package com.test.ibatis;public class Student {private long studentId;private String firstName;private String lastName;private String address;}Generate Getters and Setters for all the items in the BeanGet to know iBatis from Rohit @ http://rohitprabhakar.com

14. Spring-iBatis IntegrationCreate a table “STUDENT” with a table-per-class relationshipCREATE TABLE STUDENT(STUDENT_ID NUMBER (6, 0) NOT NULL,FIRST_NAME VARCHAR(50) NOT NULL,LAST_NAME VARCHAR(50) ,ADDRESS VARCHAR(200) NOT NULL,PRIMARY KEY (STUDENT_ID))Get to know iBatis from Rohit @ http://rohitprabhakar.com

15. Spring-iBatis Integration: applicationContext.xmlAdd the following<bean id="dataSource"class="org.apache.commons.dbcp.BasicDataSource"destroy-method="close"><property name="driverClassName"value="oracle.jdbc.driver.OracleDriver" /><property name="url"value="jdbc:oracle:thin:@127.0.0.1:1521:orcl" /><property name="username" value="scott" /><property name="password" value="tiger" /></bean><bean id="sqlMap"class="org.springframework.orm.ibatis.SqlMapClientFactoryBean"><property name="configLocation"><value>classpath:SqlMapConfig.xml</value></property><property name="dataSource" ref="dataSource" /></bean><bean id="studentService"class="com.test.ibatis.StudentServiceImpl"><property name="sqlMapClient" ref="sqlMap" /></bean>Get to know iBatis from Rohit @ http://rohitprabhakar.com

16. Spring-iBatis IntegrationSqlMapConfig.xmlAs for the configLocation property, it should be configured with the path to an XML file that enumerates the locations of the iBATIS SQL maps.<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL MAP Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd"><sqlMapConfig><settings useStatementNamespaces="true" /><sqlMap resource="StudentSQLMap.xml" /></sqlMapConfig>Get to know iBatis from Rohit @ http://rohitprabhakar.com

17. Spring-iBatis IntegrationStudentSQLMap.xml<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL MAP 2.0//EN" "http://www.ibatis.com/dtd/sql-map-2.dtd"><sqlMap namespace="student"> <typeAlias alias="student" type="com.test.ibatis.Student"/> <resultMap id="studentResult" class="Student"> <result property="studentId" column="STUDENT_ID"/> <result property="firstName" column="FIRST_NAME"/> <result property="lastName" column="LAST_NAME"/> <result property="address" column="ADDRESS"/> </resultMap> <select id="getTrade" parameterClass="long" resultMap="studentResult"> SELECT STUDENT_ID, FIRST_NAME, FIRST_NAME, ADDRESS FROM STUDENT WHERE STUDENT_ID = #id# </select> </sqlMap>Get to know iBatis from Rohit @ http://rohitprabhakar.com

18. Spring-iBatis IntegrationCreate an Interface StudentServicepackage com.test.ibatis;public interface StudentService {public Student getStudent(long studentId) throws Exception;}Get to know iBatis from Rohit @ http://rohitprabhakar.com

19. Spring-iBatis IntegrationCreate an Implementation Classpackage com.test.ibatis;import com.ibatis.sqlmap.client.SqlMapClient;public class StudentServiceImpl implements StudentService {protected SqlMapClientsqlMapclient=null;public void setSqlMapclient(SqlMapClientsqlMapclient) {this.sqlMapclient = sqlMapclient;}public Student getStudent(long studentId) throws Exception { return (Student) sqlMapclient.queryForObject("student.getStudent", studentId);}}Get to know iBatis from Rohit @ http://rohitprabhakar.com

20. Spring-iBatis Integration: Student Clientpackage com.test.ibatis;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class StudentClient {public static void Main(String[] args){// load spring beansApplicationContextctx= new ClassPathXmlApplicationContext("applicationContext.xml");StudentServicestudentService= (StudentService) ctx.getBean("studentService");//get Object StudentintstudentId=1;try {System.out.println("**********************************");System.out.println(studentService.getStudent(studentId));System.out.println("**********************************");} catch (Exception e) {e.printStackTrace();}}}Get to know iBatis from Rohit @ http://rohitprabhakar.com

21. Spring-iBatis Integration: ExecuteRun the Client and check what it prints?Get to know iBatis from Rohit @ http://rohitprabhakar.com

22. iBatis: ToolsIbatorIbator is a code generator and Eclipse plugin. It can be used to get a head start on your project by generating your Beans, Mappings and SQL from an existing database schema. Get to know iBatis from Rohit @ http://rohitprabhakar.com

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