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VoltDB client interface libraries
/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltdb.jdbc;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBC4ParameterMetaData implements java.sql.ParameterMetaData
{
private final Statement owner;
private final int parameterCount;
JDBC4ParameterMetaData(Statement owner, int parameterCount) throws SQLException
{
this.owner = owner;
this.parameterCount = parameterCount;
}
private void checkClosed() throws SQLException
{
if (this.owner.isClosed())
throw SQLError.get(SQLError.CONNECTION_CLOSED);
}
// Retrieves the fully-qualified name of the Java class whose instances should be passed to the method PreparedStatement.setObject.
public String getParameterClassName(int param) throws SQLException
{
checkClosed();
throw SQLError.noSupport();
}
// Retrieves the number of parameters in the PreparedStatement object for which this ParameterMetaData object contains information.
public int getParameterCount() throws SQLException
{
checkClosed();
return this.parameterCount;
}
// Retrieves the designated parameter's mode.
public int getParameterMode(int param) throws SQLException
{
checkClosed();
return parameterModeIn; // Only mode supported by provider
}
// Retrieves the designated parameter's SQL type.
public int getParameterType(int param) throws SQLException
{
checkClosed();
throw SQLError.noSupport();
}
// Retrieves the designated parameter's database-specific type name.
public String getParameterTypeName(int param) throws SQLException
{
checkClosed();
throw SQLError.noSupport();
}
// Retrieves the designated parameter's specified column size.
public int getPrecision(int param) throws SQLException
{
checkClosed();
throw SQLError.noSupport();
}
// Retrieves the designated parameter's number of digits to right of the decimal point.
public int getScale(int param) throws SQLException
{
checkClosed();
throw SQLError.noSupport();
}
// Retrieves whether null values are allowed in the designated parameter.
public int isNullable(int param) throws SQLException
{
checkClosed();
return parameterNullable; // Always permissible in principle (no provider control at the statement-level; the statement itself might fail validity constraints upon execution however!)
}
// Retrieves whether values for the designated parameter can be signed numbers.
public boolean isSigned(int param) throws SQLException
{
checkClosed();
throw SQLError.noSupport();
}
// Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.
public boolean isWrapperFor(Class iface) throws SQLException
{
return iface.isInstance(this);
}
// Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.
public T unwrap(Class iface) throws SQLException
{
try
{
return iface.cast(this);
}
catch (ClassCastException cce)
{
throw SQLError.get(SQLError.ILLEGAL_ARGUMENT, iface.toString());
}
}
}