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Snowflake JDBC Driver
There is a newer version: 3.20.0
package net.snowflake.client.jdbc;

import net.snowflake.client.core.MetaDataOfBinds;
import net.snowflake.client.core.SFStatementMetaData;

import java.sql.ParameterMetaData;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;

import static net.snowflake.client.jdbc.SnowflakeType.convertStringToType;

/**
 * Naive implementation of ParameterMetadata class.
 * 
 * This class is backed by SFStatementMetadata class, where metadata
 * information is stored as describe sql response.
 */
class SnowflakeParameterMetadata implements ParameterMetaData
{
  private SFStatementMetaData statementMetaData;

  SnowflakeParameterMetadata(SFStatementMetaData sfStatementMetaData)
  {
    this.statementMetaData = sfStatementMetaData;
  }

  @Override
  public int getParameterCount() throws SQLException
  {
    return statementMetaData.getNumberOfBinds();
  }

  @Override
  public int isNullable(int param) throws SQLException
  {
    MetaDataOfBinds paramInfo = statementMetaData.getMetaDataForBindParam(param);
    if (paramInfo.isNullable())
    {
      return ParameterMetaData.parameterNullable;
    }
    return ParameterMetaData.parameterNoNulls;
  }

  @Override
  public boolean isSigned(int param) throws SQLException
  {
    throw new SQLFeatureNotSupportedException();
  }

  @Override
  public int getPrecision(int param) throws SQLException
  {
    MetaDataOfBinds paramInfo = statementMetaData.getMetaDataForBindParam(param);
    return paramInfo.getPrecision();
  }

  @Override
  public int getScale(int param) throws SQLException
  {
    MetaDataOfBinds paramInfo = statementMetaData.getMetaDataForBindParam(param);
    return paramInfo.getScale();
  }

  @Override
  public int getParameterType(int param) throws SQLException
  {
    MetaDataOfBinds paramInfo = statementMetaData.getMetaDataForBindParam(param);
    return convertStringToType(paramInfo.getTypeName());
  }

  @Override
  public String getParameterTypeName(int param) throws SQLException
  {
    MetaDataOfBinds paramInfo = statementMetaData.getMetaDataForBindParam(param);
    return paramInfo.getTypeName();
  }

  @Override
  public String getParameterClassName(int param) throws SQLException
  {
    throw new SQLFeatureNotSupportedException();
  }

  @Override
  public int getParameterMode(int param) throws SQLException
  {
    throw new SQLFeatureNotSupportedException();
  }

  @SuppressWarnings("unchecked")
  @Override
  public  T unwrap(java.lang.Class iface) throws SQLException
  {
    if (!isWrapperFor(iface))
    {
      throw new SQLException(
          this.getClass().getName() + " not unwrappable from " + iface
              .getName());
    }
    return (T) this;
  }

  @Override
  public boolean isWrapperFor(java.lang.Class iface) throws SQLException
  {
    return iface.isInstance(this);
  }
}