Mega Code Archive
Blob and Clob data type
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import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class BlobClobEx {
public static void main(String[] args) throws Exception {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "yourName", "mypwd");
Statement stmt = conn.createStatement();
createBlobClobTables(stmt);
PreparedStatement pstmt = conn.prepareStatement("INSERT INTO BlobClob VALUES(40,?,?)");
File file = new File("blob.txt");
FileInputStream fis = new FileInputStream(file);
pstmt.setBinaryStream(1, fis, (int) file.length());
file = new File("clob.txt");
fis = new FileInputStream(file);
pstmt.setAsciiStream(2, fis, (int) file.length());
fis.close();
pstmt.execute();
ResultSet rs = stmt.executeQuery("SELECT * FROM BlobClob WHERE id = 40");
rs.next();
java.sql.Blob blob = rs.getBlob(2);
java.sql.Clob clob = rs.getClob(3);
byte blobVal[] = new byte[(int) blob.length()];
InputStream blobIs = blob.getBinaryStream();
blobIs.read(blobVal);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bos.write(blobVal);
blobIs.close();
char clobVal[] = new char[(int) clob.length()];
Reader r = clob.getCharacterStream();
r.read(clobVal);
StringWriter sw = new StringWriter();
sw.write(clobVal);
r.close();
conn.close();
}
public static void createBlobClobTables(Statement stmt) throws Exception {
String Sql = "CREATE TABLE BlobClob(Id NUMBER(3), b BLOB, c CLOB)";
try {
stmt.executeUpdate("DROP TABLE BlobClob");
} catch (SQLException se) {
if (se.getErrorCode() == 942)
System.out.println("Error dropping BlobClob table:" + se.getMessage());
}
if (stmt.executeUpdate(Sql) == 0)
System.out.println("BlobClob table created...");
}
}
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