Струва ми се, че трябва да използвате PL/SQL блок, за да направите това, което искате. Следното работи за мен, ако приемем, че има запис с id
1:
import oracle.jdbc.OracleDriver;
import java.sql.*;
import java.io.ByteArrayInputStream;
public class JDBCTest {
// How much test data to generate.
public static final int SIZE = 8192;
public static void main(String[] args) throws Exception {
// Generate some test data.
byte[] data = new byte[SIZE];
for (int i = 0; i < SIZE; ++i) {
data[i] = (byte) (64 + (i % 32));
}
ByteArrayInputStream stream = new ByteArrayInputStream(data);
DriverManager.registerDriver(new OracleDriver());
Connection c = DriverManager.getConnection(
"jdbc:oracle:thin:@some_database", "user", "password");
String sql =
"DECLARE\n" +
" l_line CLOB;\n" +
"BEGIN\n" +
" l_line := ?;\n" +
" UPDATE table SET log = log || l_line || CHR(10) WHERE id = ?;\n" +
"END;\n";
PreparedStatement stmt = c.prepareStatement(sql);
stmt.setAsciiStream(1, stream, SIZE);
stmt.setInt(2, 1);
stmt.execute();
stmt.close();
c.commit();
c.close();
}
}