Java/Spring/LobHandler
Содержание
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>