Masalah tipe karakter Oracle dalam permintaan Hibernate HQL

Saya menyelesaikan masalah ini menggunakan antarmuka OraclePreparedStatement dan Hibernate UserType.

Membuat kelas UserType baru dengan memperluas antarmuka org.hibernate.usertype.UserType dan menyediakan implementasi untuk metode nullSafeSet(), nullSafeGet() .

metode nullSafeSet() , kita memiliki parameter pertama sebagai PreparedStatement, di dalam metode tersebut saya melemparkan PreparedStatement ke objek OraclePreparedStatement dan meneruskan nilai String menggunakan metode setFixedCHAR().

Berikut adalah kode lengkap kelas impl UserType.

package nc3.jws.persistence.userType;

import java.io.Serializable;
import java.sql.PreparedStatement; 
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import org.apache.commons.lang.StringUtils;
import org.hibernate.type.StringType;
import org.hibernate.usertype.UserType;

/**
* 
* based on www.hibernate.org/388.html
*/

 public class OracleFixedLengthCharType implements UserType {

public OracleFixedLengthCharType() {
    System.out.println("OracleFixedLengthCharType constructor");
}

public int[] sqlTypes() {
    return new int[] { Types.CHAR };
}



public Class<String> returnedClass() {
    return String.class;
}

public boolean equals(Object x, Object y) {
    return (x == y) || (x != null && y != null && (x.equals(y)));
}

@SuppressWarnings("deprecation")
public Object nullSafeGet(ResultSet inResultSet, String[] names, Object o) throws SQLException {
    //String val = (String) Hibernate.STRING.nullSafeGet(inResultSet, names[0]);
    String val = StringType.INSTANCE.nullSafeGet(inResultSet, names[0]);
    //System.out.println("From nullSafeGet method valu is "+val);
    return val == null ? null : StringUtils.trim(val);
}


public void nullSafeSet(PreparedStatement inPreparedStatement, Object o,
        int i)
                throws SQLException {

    String val = (String) o;
    //Get the delegatingStmt object from DBCP connection pool PreparedStatement object.
    org.apache.commons.dbcp.DelegatingStatement delgatingStmt = (org.apache.commons.dbcp.DelegatingStatement)inPreparedStatement;
    //Get OraclePreparedStatement object using deletatingStatement object.

    oracle.jdbc.driver.OraclePreparedStatement oraclePreparedStmpt = (oracle.jdbc.driver.OraclePreparedStatement)delgatingStmt.getInnermostDelegate();
    //Call setFixedCHAR method, by passing string type value .
    oraclePreparedStmpt.setFixedCHAR(i, val);
}


public Object deepCopy(Object o) {
    if (o == null) {
        return null;
    }
    return new String(((String) o));
}


public boolean isMutable() {
    return false;
}

public Object assemble(Serializable cached, Object owner) {
    return cached;
}


public Serializable disassemble(Object value) {
    return (Serializable) value;
}

public Object replace(Object original, Object target, Object owner) {
    return original;
}

public int hashCode(Object obj) {
    return obj.hashCode();
}

  }

Mengonfigurasi kelas ini dengan anotasi @TypeDefs di kelas Entitas.

@TypeDefs({
@TypeDef(name = "fixedLengthChar", typeClass = nc3.jws.persistence.userType.OracleFixedLengthCharType.class)

})

Menambahkan tipe ini ke kolom tipe CHAR

@Type(type="fixedLengthChar")
@Column(name="SERVICE_NAME",nullable=true,length=16)
public String getServiceName() {
    return this.serviceName;
}