org.h2.expression.ParameterRemote Maven / Gradle / Ivy
/*
* Copyright 2004-2010 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression;
import java.io.IOException;
import java.sql.ResultSetMetaData;
import org.h2.constant.ErrorCode;
import org.h2.message.DbException;
import org.h2.value.Transfer;
import org.h2.value.Value;
/**
* A client side (remote) parameter.
*/
public class ParameterRemote implements ParameterInterface {
private Value value;
private int index;
private int dataType = Value.UNKNOWN;
private long precision;
private int scale;
private int nullable = ResultSetMetaData.columnNullableUnknown;
public ParameterRemote(int index) {
this.index = index;
}
public void setValue(Value newValue, boolean closeOld) {
if (closeOld && value != null) {
value.close();
}
value = newValue;
}
public Value getParamValue() {
return value;
}
public void checkSet() {
if (value == null) {
throw DbException.get(ErrorCode.PARAMETER_NOT_SET_1, "#" + (index + 1));
}
}
public int getType() {
return value == null ? dataType : value.getType();
}
public long getPrecision() {
return value == null ? precision : value.getPrecision();
}
public int getScale() {
return value == null ? scale : value.getScale();
}
public int getNullable() {
return nullable;
}
/**
* Write the parameter meta data from the transfer object.
*
* @param transfer the transfer object
*/
public void readMetaData(Transfer transfer) throws IOException {
dataType = transfer.readInt();
precision = transfer.readLong();
scale = transfer.readInt();
nullable = transfer.readInt();
}
/**
* Write the parameter meta data to the transfer object.
*
* @param transfer the transfer object
* @param p the parameter
*/
public static void writeMetaData(Transfer transfer, ParameterInterface p) throws IOException {
transfer.writeInt(p.getType());
transfer.writeLong(p.getPrecision());
transfer.writeInt(p.getScale());
transfer.writeInt(p.getNullable());
}
}