java.lang.Object
- org.lwjgl.system.Pointer.Default
- - org.lwjgl.system.Struct
  - - org.lwjgl.util.lmdb.MDBVal

All Implemented Interfaces:

java.lang.AutoCloseable, org.lwjgl.system.NativeResource, org.lwjgl.system.Pointer
```
public class MDBVal
extends org.lwjgl.system.Struct
implements org.lwjgl.system.NativeResource
```
Generic structure used for passing keys and data in and out of the database.
Values returned from the database are valid only until a subsequent update operation, or the end of the transaction. Do not modify or free them, they commonly point into the database itself.

Key sizes must be between 1 and env_get_maxkeysize inclusive. The same applies to data sizes in databases with the DUPSORT flag. Other data items can in theory be from 0 to 0xffffffff bytes long.

Member documentation
- mv_size – Size of the data item.
- mv_data – Address of the data item.
Layout
```
struct MDB_val {
    size_t mv_size;
    void * mv_data;
}
```

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class MDBVal.Buffer
An array of MDBVal structs.
- Nested classes/interfaces inherited from interface org.lwjgl.system.Pointer
  org.lwjgl.system.Pointer.Default

Field Summary

Fields
Modifier and Type Field and Description

static int SIZEOF
The struct size in bytes.
- Fields inherited from interface org.lwjgl.system.Pointer
  POINTER_SHIFT, POINTER_SIZE

Constructor Summary

Constructors
Constructor and Description

MDBVal(java.nio.ByteBuffer container)
Creates a MDBVal instance at the current position of the specified ByteBuffer container.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static MDBVal`	`calloc()` Returns a new `MDBVal` instance allocated with `memCalloc`.
`static MDBVal.Buffer`	`calloc(int capacity)` Returns a new `MDBVal.Buffer` instance allocated with `memCalloc`.
`static MDBVal`	`callocStack()` Returns a new `MDBVal` instance allocated on the thread-local `MemoryStack` and initializes all its bits to zero.
`static MDBVal.Buffer`	`callocStack(int capacity)` Returns a new `MDBVal.Buffer` instance allocated on the thread-local `MemoryStack` and initializes all its bits to zero.
`static MDBVal.Buffer`	`callocStack(int capacity, org.lwjgl.system.MemoryStack stack)` Returns a new `MDBVal.Buffer` instance allocated on the specified `MemoryStack` and initializes all its bits to zero.
`static MDBVal`	`callocStack(org.lwjgl.system.MemoryStack stack)` Returns a new `MDBVal` instance allocated on the specified `MemoryStack` and initializes all its bits to zero.
`static MDBVal`	`create()` Returns a new `MDBVal` instance allocated with `BufferUtils`.
`static MDBVal.Buffer`	`create(int capacity)` Returns a new `MDBVal.Buffer` instance allocated with `BufferUtils`.
`static MDBVal`	`create(long address)` Returns a new `MDBVal` instance for the specified memory address or `null` if the address is `NULL`.
`static MDBVal.Buffer`	`create(long address, int capacity)` Create a `MDBVal.Buffer` instance at the specified memory.
`static MDBVal`	`malloc()` Returns a new `MDBVal` instance allocated with `memAlloc`.
`static MDBVal.Buffer`	`malloc(int capacity)` Returns a new `MDBVal.Buffer` instance allocated with `memAlloc`.
`static MDBVal`	`mallocStack()` Returns a new `MDBVal` instance allocated on the thread-local `MemoryStack`.
`static MDBVal.Buffer`	`mallocStack(int capacity)` Returns a new `MDBVal.Buffer` instance allocated on the thread-local `MemoryStack`.
`static MDBVal.Buffer`	`mallocStack(int capacity, org.lwjgl.system.MemoryStack stack)` Returns a new `MDBVal.Buffer` instance allocated on the specified `MemoryStack`.
`static MDBVal`	`mallocStack(org.lwjgl.system.MemoryStack stack)` Returns a new `MDBVal` instance allocated on the specified `MemoryStack`.
`java.nio.ByteBuffer`	`mv_data()` Returns a `ByteBuffer` view of the data pointed to by the `mv_data` field.
`MDBVal`	`mv_data(java.nio.ByteBuffer value)` Sets the address of the specified `ByteBuffer` to the `mv_data` field.
`long`	`mv_size()` Returns the value of the `mv_size` field.
`MDBVal`	`mv_size(long value)` Sets the specified value to the `mv_size` field.
`MDBVal`	`nset(long struct)` Unsafe version of `set`.
`MDBVal`	`set(long mv_size, java.nio.ByteBuffer mv_data)` Initializes this struct with the specified values.
`MDBVal`	`set(MDBVal src)` Copies the specified struct data to this struct.
`int`	`sizeof()` Returns the `sizeof(struct)`.

Methods inherited from class org.lwjgl.system.Struct
clear, free

Methods inherited from class org.lwjgl.system.Pointer.Default
address, equals, hashCode, toString

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.lwjgl.system.NativeResource
close, free

- Field Detail
  - SIZEOF
```
public static final int SIZEOF
```
    The struct size in bytes.
- Constructor Detail
  - MDBVal
```
public MDBVal(java.nio.ByteBuffer container)
```
    Creates a MDBVal instance at the current position of the specified ByteBuffer container. Changes to the buffer's content will be visible to the struct instance and vice versa.
    The created instance holds a strong reference to the container object.
- Method Detail
  - sizeof
```
public int sizeof()
```
    Description copied from class: org.lwjgl.system.Struct
    
    Returns the sizeof(struct).
    
    Specified by:
    
    sizeof in class org.lwjgl.system.Struct
  - mv_size
```
public long mv_size()
```
    Returns the value of the mv_size field.
  - mv_data
```
public java.nio.ByteBuffer mv_data()
```
    Returns a ByteBuffer view of the data pointed to by the mv_data field.
  - mv_size
```
public MDBVal mv_size(long value)
```
    Sets the specified value to the mv_size field.
  - mv_data
```
public MDBVal mv_data(java.nio.ByteBuffer value)
```
    Sets the address of the specified ByteBuffer to the mv_data field.
  - set
```
public MDBVal set(long mv_size,
                  java.nio.ByteBuffer mv_data)
```
    Initializes this struct with the specified values.
  - nset
```
public MDBVal nset(long struct)
```
    Unsafe version of set.
  - set
```
public MDBVal set(MDBVal src)
```
    Copies the specified struct data to this struct.
    
    Parameters:
    
    src - the source struct
    
    Returns:
    
    this struct
  - malloc
```
public static MDBVal malloc()
```
    Returns a new MDBVal instance allocated with memAlloc. The instance must be explicitly freed.
  - calloc
```
public static MDBVal calloc()
```
    Returns a new MDBVal instance allocated with memCalloc. The instance must be explicitly freed.
  - create
```
public static MDBVal create()
```
    Returns a new MDBVal instance allocated with BufferUtils.
  - create
```
public static MDBVal create(long address)
```
    Returns a new MDBVal instance for the specified memory address or null if the address is NULL.
  - malloc
```
public static MDBVal.Buffer malloc(int capacity)
```
    Returns a new MDBVal.Buffer instance allocated with memAlloc. The instance must be explicitly freed.
    
    Parameters:
    
    capacity - the buffer capacity
  - calloc
```
public static MDBVal.Buffer calloc(int capacity)
```
    Returns a new MDBVal.Buffer instance allocated with memCalloc. The instance must be explicitly freed.
    
    Parameters:
    
    capacity - the buffer capacity
  - create
```
public static MDBVal.Buffer create(int capacity)
```
    Returns a new MDBVal.Buffer instance allocated with BufferUtils.
    
    Parameters:
    
    capacity - the buffer capacity
  - create
```
public static MDBVal.Buffer create(long address,
                                   int capacity)
```
    Create a MDBVal.Buffer instance at the specified memory.
    
    Parameters:
    
    address - the memory address
    
    capacity - the buffer capacity
  - mallocStack
```
public static MDBVal mallocStack()
```
    Returns a new MDBVal instance allocated on the thread-local MemoryStack.
  - callocStack
```
public static MDBVal callocStack()
```
    Returns a new MDBVal instance allocated on the thread-local MemoryStack and initializes all its bits to zero.
  - mallocStack
```
public static MDBVal mallocStack(org.lwjgl.system.MemoryStack stack)
```
    Returns a new MDBVal instance allocated on the specified MemoryStack.
    
    Parameters:
    
    stack - the stack from which to allocate
  - callocStack
```
public static MDBVal callocStack(org.lwjgl.system.MemoryStack stack)
```
    Returns a new MDBVal instance allocated on the specified MemoryStack and initializes all its bits to zero.
    
    Parameters:
    
    stack - the stack from which to allocate
  - mallocStack
```
public static MDBVal.Buffer mallocStack(int capacity)
```
    Returns a new MDBVal.Buffer instance allocated on the thread-local MemoryStack.
    
    Parameters:
    
    capacity - the buffer capacity
  - callocStack
```
public static MDBVal.Buffer callocStack(int capacity)
```
    Returns a new MDBVal.Buffer instance allocated on the thread-local MemoryStack and initializes all its bits to zero.
    
    Parameters:
    
    capacity - the buffer capacity
  - mallocStack
```
public static MDBVal.Buffer mallocStack(int capacity,
                                        org.lwjgl.system.MemoryStack stack)
```
    Returns a new MDBVal.Buffer instance allocated on the specified MemoryStack.
    
    Parameters:
    
    stack - the stack from which to allocate
    
    capacity - the buffer capacity
  - callocStack
```
public static MDBVal.Buffer callocStack(int capacity,
                                        org.lwjgl.system.MemoryStack stack)
```
    Returns a new MDBVal.Buffer instance allocated on the specified MemoryStack and initializes all its bits to zero.
    
    Parameters:
    
    stack - the stack from which to allocate
    
    capacity - the buffer capacity

Class MDBVal

Member documentation

Layout

Nested Class Summary

Nested classes/interfaces inherited from interface org.lwjgl.system.Pointer

Field Summary

Fields inherited from interface org.lwjgl.system.Pointer

Constructor Summary

Method Summary

Methods inherited from class org.lwjgl.system.Struct

Methods inherited from class org.lwjgl.system.Pointer.Default

Methods inherited from class java.lang.Object

Methods inherited from interface org.lwjgl.system.NativeResource

Field Detail

SIZEOF

Constructor Detail

MDBVal

Method Detail

sizeof

mv_size

mv_data

mv_size

mv_data

set

nset

set

malloc

calloc

create

create

malloc

calloc

create

create

mallocStack

callocStack

mallocStack

callocStack

mallocStack

callocStack

mallocStack

callocStack