} else {
		tx.Statement.Omits = columns
	}
	return
}

// MapColumns modify the column names in the query results to facilitate align to the corresponding structural fields
func (db *DB) MapColumns(m map[string]string) (tx *DB) {
	tx = db.getInstance()
	tx.Statement.ColumnMapping = m
	return
}

// Where add conditions
//

  //
  // Network identity
  //

  /**
   * Returns {@code true} iff {@code object} is a {@link Network} that has the same elements and the
   * same structural relationships as those in this network.
   *
   * <p>Thus, two networks A and B are equal if <b>all</b> of the following are true:
   *
   * <ul>
   *   <li>A and B have equal {@link #isDirected() directedness}.

        }
      } else {
        throw new IllegalArgumentException("Value already present in map: " + newValue);
      }
    }
    // we do *not* update insertion order, and it isn't a structural modification!
    deleteFromTableVToK(entry, Hashing.smearedHash(values[entry]));
    values[entry] = newValue;
    insertIntoTableVToK(entry, newValueHash);
  }

  /**

import jcifs.dcerpc.ndr.NdrBuffer;
import jcifs.dcerpc.ndr.NdrException;
import jcifs.dcerpc.ndr.NdrLong;
import jcifs.dcerpc.ndr.NdrObject;

/**
 * DCE/RPC interface for Distributed File System (DFS) operations.
 * Provides structures and methods for DFS management and enumeration.
 */
@SuppressWarnings("all")
public class netdfs {

    /**
     * Default constructor for netdfs
     */
    public netdfs() {
        // Default constructor

import jcifs.smb1.dcerpc.ndr.NdrException;
import jcifs.smb1.dcerpc.ndr.NdrLong;
import jcifs.smb1.dcerpc.ndr.NdrObject;

/**
 * DCE/RPC interface for Distributed File System (DFS) operations.
 * Provides structures and methods for DFS management and enumeration.
 */
public class netdfs {

    /**
     * Default constructor for netdfs
     */
    public netdfs() {
        // Default constructor
    }

    /**

            if (_netnamep != 0) {
                _src = _src.deferred;
                netname = _src.dec_ndr_string();

            }
        }
    }

    /**
     * Container for ShareInfo0 structures.
     */
    public static class ShareInfoCtr0 extends NdrObject {

        /**
         * Default constructor for ShareInfoCtr0.
         */
        public ShareInfoCtr0() {
        }

        /**

            if (_netnamep != 0) {
                _src = _src.deferred;
                this.netname = _src.dec_ndr_string();

            }
        }
    }

    /**
     * Container for ShareInfo0 structures.
     */
    public static class ShareInfoCtr0 extends NdrObject {

        /**
         * Default constructor for ShareInfoCtr0.
         */
        public ShareInfoCtr0() {
        }

        /**

import jcifs.smb1.dcerpc.ndr.NdrBuffer;
import jcifs.smb1.dcerpc.ndr.NdrException;
import jcifs.smb1.dcerpc.ndr.NdrObject;

/**
 * RPC data structure definitions for DCE/RPC protocol support.
 * This class contains NDR (Network Data Representation) encodable/decodable structures
 * used in DCE/RPC communications.
 */
public class rpc {

    /**
     * Private constructor to prevent instantiation of utility class.
     */

package jcifs.dcerpc;

import jcifs.dcerpc.ndr.NdrBuffer;
import jcifs.dcerpc.ndr.NdrException;
import jcifs.dcerpc.ndr.NdrObject;

/**
 * RPC data structure definitions for DCE/RPC protocol support.
 * This class contains NDR (Network Data Representation) encodable/decodable structures
 * used in DCE/RPC communications including UUID, policy handles, unicode strings, and SIDs.
 */
@SuppressWarnings("all")
public class rpc {

    /**

}
```

### 3.2 Lease Versions
- **Lease V1**: Basic lease support (SMB 3.0)
- **Lease V2**: Adds epoch support for better consistency (SMB 3.0.2+)

## 4. Data Structures

### 4.1 Lease Key Structure
```java
package jcifs.internal.smb2.lease;

import java.security.SecureRandom;
import java.util.Arrays;

public class Smb2LeaseKey {
    private final byte[] key;  // 16-byte lease key