BAEL-788 A guid to mybatis (#1637)

* BAEL-788 A guid to mybatis

* BAEL-788 A guid to mybatis

mybatis/src/main/java/com/baeldung/mybatis/mapper/AddressMapper.java

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+package com.baeldung.mybatis.mapper;
+
+import com.baeldung.mybatis.model.Address;
+import com.baeldung.mybatis.model.Person;
+import org.apache.ibatis.annotations.*;
+
+
+public interface AddressMapper {
+
+    @Insert("Insert into address (streetAddress,personId) values(#{streetAddress},#{personId})")
+    @Options(useGeneratedKeys = true,flushCache=true )
+    public Integer saveAddress(Address address);
+
+    @Select("SELECT addressId, streetAddress FROM Address WHERE addressId = #{addressId}")
+    @Results(value = {
+            @Result(property = "addressId", column = "addressId"),
+            @Result(property = "streetAddress", column = "streetAddress"),
+            @Result(property = "person", column = "personId",javaType =Person.class,one=@One(select = "getPerson"))
+    })
+    Address getAddresses(Integer addressID);
+
+    @Select("SELECT personId FROM address WHERE addressId = #{addressId})")
+    Person getPerson(Integer personId);
+}

mybatis/src/main/java/com/baeldung/mybatis/mapper/PersonMapper.java

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+package com.baeldung.mybatis.mapper;
+
+import com.baeldung.mybatis.model.Address;
+import com.baeldung.mybatis.model.Person;
+import com.baeldung.mybatis.utils.MyBatisUtil;
+import org.apache.ibatis.annotations.*;
+import org.apache.ibatis.mapping.StatementType;
+
+import java.util.List;
+import java.util.Map;
+
+
+public interface PersonMapper {
+
+    @Insert("Insert into person(name) values (#{name})")
+    public Integer save(Person person);
+
+    @Update("Update Person set name= #{name} where personId=#{personId}")
+    public void updatePerson(Person person);
+
+    @Delete("Delete from Person where personId=#{personId}")
+    public void deletePersonById(Integer personId);
+
+    @Select("SELECT person.personId, person.name FROM person WHERE person.personId = #{personId}")
+    Person getPerson(Integer personId);
+
+    @Select("Select personId,name from Person where personId=#{personId}")
+    @Results(value ={
+            @Result(property = "personId", column = "personId"),
+            @Result(property="name", column = "name"),
+            @Result(property = "addresses",javaType = List.class,column = "personId",
+                     many=@Many(select = "getAddresses"))
+
+    })
+    public Person getPersonById(Integer personId);
+
+    @Select("select addressId,streetAddress,personId from address where personId=#{personId}")
+    public Address getAddresses(Integer personId);
+
+    @Select("select * from Person ")
+    @MapKey("personId")
+    Map<Integer,Person> getAllPerson();
+
+    @SelectProvider(type=MyBatisUtil.class,method="getPersonByName")
+    public Person getPersonByName(String name);
+
+
+    @Select(value= "{ CALL getPersonByProc( #{personId, mode=IN, jdbcType=INTEGER})}")
+    @Options(statementType = StatementType.CALLABLE)
+    public Person getPersonByProc(Integer personId);
+
+}

mybatis/src/main/java/com/baeldung/mybatis/model/Address.java

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+package com.baeldung.mybatis.model;
+
+
+public class Address {
+
+    private Integer addressId;
+    private String streetAddress;
+    private Integer personId;
+
+    public Address() {
+    }
+
+    public Integer getPersonId() {
+        return personId;
+    }
+
+    public void setPersonId(Integer personId) {
+        this.personId = personId;
+    }
+
+
+
+    public Address(String streetAddress) {
+        this.streetAddress =streetAddress;
+    }
+
+    public Person getPerson() {
+        return person;
+    }
+
+    public void setPerson(Person person) {
+        this.person = person;
+    }
+
+    private Person person;
+
+    public Address(int i, String name) {
+        this.streetAddress = name;
+    }
+
+    public Integer getAddressId() {
+        return addressId;
+    }
+
+    public String getStreetAddress() {
+        return streetAddress;
+    }
+
+}

mybatis/src/main/java/com/baeldung/mybatis/model/Person.java

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+package com.baeldung.mybatis.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+
+public class Person {
+
+    private Integer personId;
+    private String name;
+    private List<Address> addresses;
+
+    public Person() {
+    }
+
+    public Person(Integer personId, String name) {
+        this.personId=personId;
+        this.name = name;
+        addresses = new ArrayList<Address>();
+    }
+
+    public Person(String name) {
+        this.name=name;
+    }
+
+    public Integer getPersonId() {
+        return personId;
+    }
+
+    public String getName() {
+        return name;
+    }
+    public void addAddress(Address address){
+        addresses.add(address);
+    }
+
+    public List<Address> getAddresses() {
+        return addresses;
+    }
+}

mybatis/src/main/java/com/baeldung/mybatis/utils/MyBatisUtil.java

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+package com.baeldung.mybatis.utils;
+import org.apache.ibatis.io.Resources;
+import org.apache.ibatis.jdbc.SQL;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class MyBatisUtil {
+    private static SqlSessionFactory sqlSessionFactory;
+    static {
+        String resource = "mybatis-config.xml";
+        InputStream inputStream;
+        try {
+            inputStream = Resources.getResourceAsStream(resource);
+            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+    public static SqlSessionFactory getSqlSessionFactory(){
+        return sqlSessionFactory;
+    }
+
+    public String getPersonByName(String name){
+        return new SQL(){{
+            SELECT("*");
+            FROM("person");
+            WHERE("name like #{name} || '%'");
+        }}.toString();
+    }
+}

mybatis/src/main/resources/mybatis-config.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration
+        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-config.dtd">
+<configuration>
+    <environments default="development">
+        <environment id="development">
+            <transactionManager type="JDBC"/>
+            <dataSource type="POOLED">
+                <property name="driver" value="org.apache.derby.jdbc.EmbeddedDriver"/>
+                <property name="url" value="jdbc:derby:testdb1;create=true"/>
+                <property name="username" value="sa"/>
+                <property name="password" value="pass123"/>
+            </dataSource>
+        </environment>
+    </environments>
+    <mappers>
+        <mapper class="com.baeldung.mybatis.mapper.PersonMapper"/>
+        <mapper class="com.baeldung.mybatis.mapper.AddressMapper"/>
+    </mappers>
+</configuration>