Java/Spring/LobHandler

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Deal With Binary Stream With LobHandler

   <source lang="java">
      

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"

   "http://www.springframework.org/dtd/spring-beans.dtd">

<beans> <bean id="dataSource" class="org.apache.rumons.dbcp.BasicDataSource"

     destroy-method="close">
 <property name="driverClassName" value="org.hsqldb.jdbcDriver"/>
 <property name="url" value="jdbc:hsqldb:mem:."/>
 <property name="username" value="sa"/>
 <property name="password" value=""/>

</bean> <bean id="employeeDao" class="EmployeeDaoImpl">

 <property name="dataSource" ref="dataSource"/>

</bean> </beans>

File: EmployeeDaoImpl.java import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Types; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.sql.DataSource; import org.springframework.dao.DataAccessException; import org.springframework.jdbc.core.BatchPreparedStatementSetter; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.core.SqlOutParameter; import org.springframework.jdbc.core.SqlParameter; import org.springframework.jdbc.core.simple.ParameterizedRowMapper; import org.springframework.jdbc.core.simple.SimpleJdbcTemplate; import org.springframework.jdbc.core.support.AbstractLobCreatingPreparedStatementCallback; import org.springframework.jdbc.core.support.AbstractLobStreamingResultSetExtractor; import org.springframework.jdbc.core.support.JdbcDaoSupport; import org.springframework.jdbc.object.MappingSqlQuery; import org.springframework.jdbc.object.SqlUpdate; import org.springframework.jdbc.object.StoredProcedure; import org.springframework.jdbc.support.lob.DefaultLobHandler; import org.springframework.jdbc.support.lob.LobCreator; import org.springframework.jdbc.support.lob.LobHandler; import org.springframework.jdbc.support.nativejdbc.SimpleNativeJdbcExtractor; import org.springframework.util.FileCopyUtils; //import org.apache.rumons.dbcp.BasicDataSource;

public class EmployeeDaoImpl extends JdbcDaoSupport{

 protected void initDao() throws Exception {
   super.initDao();
   getJdbcTemplate().setNativeJdbcExtractor(new SimpleNativeJdbcExtractor());
 }
 private LobHandler lobHandler = new DefaultLobHandler();
 
 public void addImageForEmployee(final Integer employeeId, final InputStream in) throws IOException {
   final int imageSize = in.available();
   getJdbcTemplate().execute("INSERT INTO employee (id, image) VALUES (?, ?)",
       new AbstractLobCreatingPreparedStatementCallback(lobHandler) {
         protected void setValues(PreparedStatement ps, LobCreator lobCreator)
             throws SQLException, DataAccessException {
           ps.setInt(1, employeeId);
           lobCreator.setBlobAsBinaryStream(ps, 2, in, imageSize);
         }
       });
 }
 public void getImage(Integer id, final OutputStream out) {
   getJdbcTemplate().query("SELECT image FROM employee WHERE id = ?",
       new AbstractLobStreamingResultSetExtractor() {
         protected void streamData(ResultSet rs) throws SQLException, IOException {
           FileCopyUtils.copy(lobHandler.getBlobAsBinaryStream(rs, 1), out);
         }
       });
 }
  

}

class Employee {

 private Integer id;
 private Name name = new Name();
 private Integer age;
 private Sex sex;
 private Address address = new Address();
 private List<PhoneNumber> phoneNumbers = new ArrayList<PhoneNumber>();
 public Employee() {
 }
 public Employee(String firstName, String lastName) {
   this.getName().setFirst(firstName);
   this.getName().setLast(lastName);
 }
 void setId(Integer id) {
   this.id = id;
 }
 public Integer getId() {
   return id;
 }
 public Address getAddress() {
   return address;
 }
 public Integer getAge() {
   return age;
 }
 public void setAge(Integer age) {
   this.age = age;
 }
 public Name getName() {
   return name;
 }
 public List<PhoneNumber> getPhoneNumbers() {
   return Collections.unmodifiableList(phoneNumbers);
 }
 public void addPhoneNumber(PhoneNumber phoneNumber) {
   this.phoneNumbers.add(phoneNumber);
 }
 public void removePhoneNumber(PhoneNumber phoneNumber) {
   this.phoneNumbers.remove(phoneNumber);
 }
 public void removePhoneNumber(int index) {
   this.phoneNumbers.remove(index);
 }
 public Sex getSex() {
   return sex;
 }
 public void setSex(Sex sex) {
   this.sex = sex;
 }

} abstract class Sex {

 public static final Sex MALE = new Male();
 public static final Sex FEMALE = new Female();
 public boolean equals(Object o) {
   if (o == null) {
     return false;
   }
   return getClass().equals(o.getClass());
 }

} class PhoneNumber { } class Address {

 private String line1;
 private String line2;
 private String city;
 private String state;
 private String zip;
 public void setLine1(String line1) {
   this.line1 = line1;
 }
 public String getLine1() {
   return this.line1;
 }
 public void setLine2(String line2) {
   this.line2 = line2;
 }
 public String getLine2() {
   return this.line2;
 }
 public void setCity(String city) {
   this.city = city;
 }
 public String getCity() {
   return this.city;
 }
 public void setState(String state) {
   this.state = state;
 }
 public String getState() {
   return this.state;
 }
 public void setZip(String zip) {
   this.zip = zip;
 }
 public String getZip() {
   return this.zip;
 }

} final class Male extends Sex {

 protected Male() {
 }

} final class Female extends Sex {

 protected Female() {
 }

}

class Name {

 private String first;
 private String middle;
 private String last;
 public void setFirst(String first) {
   this.first = first;
 }
 public String getFirst() {
   return this.first;
 }
 public void setMiddle(String middle) {
   this.middle = middle;
 }
 public String getMiddle() {
   return this.middle;
 }
 public void setLast(String last) {
   this.last = last;
 }
 public String getLast() {
   return this.last;
 }

}

File: Main.java import java.util.Date; import java.util.GregorianCalendar; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; class Main {

 public static void main(String args[]) throws Exception {
   ApplicationContext ctx = new ClassPathXmlApplicationContext(
       "context.xml");
   EmployeeDaoImpl ws = (EmployeeDaoImpl) ctx.getBean("employeeDao");
 }

}


      </source>
   
  
 
  



Insert Clob Data

   <source lang="java">
      

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"

      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:util="http://www.springframework.org/schema/util"
      xmlns:tx="http://www.springframework.org/schema/tx"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xmlns:lang="http://www.springframework.org/schema/lang"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                          http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd
                          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
                          http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
                          http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd">
   <bean id="dataSource" class="org.apache.rumons.dbcp.BasicDataSource" destroy-method="close">
   <property name="driverClassName" value="org.hsqldb.jdbcDriver"/>
   <property name="url" value="jdbc:hsqldb:mem:."/>
   <property name="username" value="sa"/>
   <property name="password" value=""/>
   </bean>
   <bean id="lobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler">
       <property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"/>
   </bean>
   <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.rumonsDbcpNativeJdbcExtractor"/>
   <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
       <property name="dataSource" ref="dataSource"/>
   </bean>

</beans>

File: Main.java import java.sql.PreparedStatement; import java.sql.SQLException; import java.sql.Timestamp; import javax.sql.DataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.PreparedStatementSetter; import org.springframework.jdbc.support.lob.LobHandler; class Main {

 public static void main(String args[]) throws Exception {
   ApplicationContext ac = new ClassPathXmlApplicationContext("context.xml", Main.class);
   DataSource dataSource = (DataSource) ac.getBean("dataSource");
   // DataSource mysqlDataSource = (DataSource) ac.getBean("mysqlDataSource");
   final LobHandler lobHandler = (LobHandler) ac.getBean("lobHandler");
   JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
   jdbcTemplate.update("insert into customer(id,first_name,last_name,last_login,comments) "
       + "values (?, ?, ?, ?, ?)", new PreparedStatementSetter() {
     public void setValues(PreparedStatement ps) throws SQLException {
       ps.setLong(1, 2L);
       ps.setString(2, "A");
       ps.setString(3, "B");
       ps.setTimestamp(4, new Timestamp(System.currentTimeMillis()));
       lobHandler.getLobCreator().setClobAsString(ps, 5, "Clob data");
     }
   });
 }

}


      </source>
   
  
 
  



Read ClobData As AsciiString

   <source lang="java">
      

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"

      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:util="http://www.springframework.org/schema/util"
      xmlns:tx="http://www.springframework.org/schema/tx"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xmlns:lang="http://www.springframework.org/schema/lang"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                          http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd
                          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
                          http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
                          http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd">
   <bean id="dataSource" class="org.apache.rumons.dbcp.BasicDataSource" destroy-method="close">
   <property name="driverClassName" value="org.hsqldb.jdbcDriver"/>
   <property name="url" value="jdbc:hsqldb:mem:."/>
   <property name="username" value="sa"/>
   <property name="password" value=""/>
   </bean>
   <bean id="lobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler">
       <property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"/>
   </bean>
   <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.rumonsDbcpNativeJdbcExtractor"/>
   <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
       <property name="dataSource" ref="dataSource"/>
   </bean>

</beans>

File: Main.java import java.io.IOException; import java.io.InputStream; import java.sql.ResultSet; import java.sql.SQLException; import javax.sql.DataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.support.lob.LobHandler; class Main {

 public static void main(String args[]) throws Exception {
   ApplicationContext ac = new ClassPathXmlApplicationContext("context.xml", Main.class);
   DataSource dataSource = (DataSource) ac.getBean("dataSource");
   // DataSource mysqlDataSource = (DataSource) ac.getBean("mysqlDataSource");
   final LobHandler lobHandler = (LobHandler) ac.getBean("lobHandler");
   JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
   jdbcTemplate.query("select comments from t_customer where id=?", new Object[] { 2L },
       new RowMapper() {
         private String readAsAscii(InputStream is) throws IOException {
           StringBuffer out = new StringBuffer();
           byte[] buffer = new byte[1024];
           int read;
           try {
             while ((read = is.read(buffer, 0, buffer.length)) > 0) {
               for (int i = 0; i < read; i++) {
                 out.append(String.format("%x", buffer[i]));
               }
             }
           } finally {
             is.close();
           }
           return out.toString();
         }
         public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
           InputStream stream = lobHandler.getClobAsAsciiStream(rs, 1);
           try {
             return readAsAscii(stream);
           } catch (IOException ex) {
             // 
           }
           return null;
         }
       });
 }

}


      </source>
   
  
 
  



Use LobHandler To Handle Large Chunk of Data

   <source lang="java">

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"

      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:util="http://www.springframework.org/schema/util"
      xmlns:tx="http://www.springframework.org/schema/tx"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xmlns:lang="http://www.springframework.org/schema/lang"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                          http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd
                          http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
                          http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
                          http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd">
   <bean id="dataSource" class="org.apache.rumons.dbcp.BasicDataSource" destroy-method="close">
   <property name="driverClassName" value="org.hsqldb.jdbcDriver"/>
   <property name="url" value="jdbc:hsqldb:mem:."/>
   <property name="username" value="sa"/>
   <property name="password" value=""/>
   </bean>
   <bean id="lobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler">
       <property name="nativeJdbcExtractor" ref="nativeJdbcExtractor"/>
   </bean>
   <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.rumonsDbcpNativeJdbcExtractor"/>
   <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
       <property name="dataSource" ref="dataSource"/>
   </bean>

</beans>

File: Main.java import java.sql.ResultSet; import java.sql.SQLException; import javax.sql.DataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import org.springframework.jdbc.support.lob.LobHandler; class Main {

 public static void main(String args[]) throws Exception {
   ApplicationContext ac = new ClassPathXmlApplicationContext("context.xml", Main.class);
   DataSource dataSource = (DataSource) ac.getBean("dataSource");
   //DataSource mysqlDataSource = (DataSource) ac.getBean("mysqlDataSource");
   final LobHandler lobHandler = (LobHandler) ac.getBean("lobHandler");
   
   JdbcTemplate jdbcTemplate= new JdbcTemplate(dataSource);
   jdbcTemplate.query("select comments from t_customer where id=?", new Object[] { 2L }, new RowMapper() {
     public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
         return lobHandler.getClobAsString(rs, 1);
     }
 });
 }

}


      </source>