Java/Spring/LobHandler

Deal With Binary Stream With LobHandler

       
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");
  }
}

Insert Clob Data

       
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="oracle.jdbc.driver.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@oracle.devcake.co.uk:1521:INTL"/>
        <property name="username" value="sa"/>
        <property name="password" value=""/>
    </bean>
-->
    <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="mysqlDataSource" class="org.apache.rumons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://dbhost-prospring-psql/prospring"/>
        <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");
      }
    });
  }
}

Read ClobData As AsciiString

       
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="oracle.jdbc.driver.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@oracle.devcake.co.uk:1521:INTL"/>
        <property name="username" value="sa"/>
        <property name="password" value=""/>
    </bean>
-->
    <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="mysqlDataSource" class="org.apache.rumons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://dbhost-prospring-psql/prospring"/>
        <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;
          }
        });
  }
}

Use LobHandler To Handle Large Chunk of Data

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="oracle.jdbc.driver.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@oracle.devcake.co.uk:1521:INTL"/>
        <property name="username" value="sa"/>
        <property name="password" value=""/>
    </bean>
-->
    <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="mysqlDataSource" class="org.apache.rumons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://dbhost-prospring-psql/prospring"/>
        <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);
      }
  });
  }
}