LazyResult

java.lang.Object
- org.h2.result.LazyResult

All Implemented Interfaces:

java.lang.AutoCloseable, ResultInterface
```
public abstract class LazyResult
extends java.lang.Object
implements ResultInterface
```
Lazy execution support for queries.

Constructor Summary

Constructors
Constructor and Description

LazyResult(Expression[] expressions)

Constructors
Constructor and Description
`LazyResult(Expression[] expressions)`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`close()` Close the result and delete any temporary files
`boolean`	`containsDistinct(Value[] values)` Check if this result set contains the given row.
`ResultInterface`	`createShallowCopy(SessionInterface targetSession)` Create a shallow copy of the result set.
`Value[]`	`currentRow()` Get the current row.
`protected abstract Value[]`	`fetchNextRow()` Fetch next row or null if none available.
`java.lang.String`	`getAlias(int i)` Get the column alias name for the column.
`java.lang.String`	`getColumnName(int i)` Get the column name.
`long`	`getColumnPrecision(int i)` Get the precision for this column.
`int`	`getColumnScale(int i)` Get the scale for this column.
`int`	`getColumnType(int i)` Get the column data type.
`int`	`getDisplaySize(int i)` Get the display size for this column.
`int`	`getFetchSize()` Get the current fetch size for this result set.
`int`	`getNullable(int i)` Check if this column is nullable.
`int`	`getRowCount()` Get the number of rows in this object.
`int`	`getRowId()` Get the current row id, starting with 0.
`java.lang.String`	`getSchemaName(int i)` Get the schema name for the column, if one exists.
`java.lang.String`	`getTableName(int i)` Get the table name for the column, if one exists.
`boolean`	`hasNext()` Check if this result has more rows to fetch.
`boolean`	`isAfterLast()` Check if the current position is after last row.
`boolean`	`isAutoIncrement(int i)` Check if this is an auto-increment column.
`boolean`	`isClosed()` Check if this result set is closed.
`boolean`	`isLazy()` Check if this a lazy execution result.
`boolean`	`needToClose()` Check if this result set should be closed, for example because it is buffered using a temporary file.
`boolean`	`next()` Go to the next row.
`void`	`reset()` Go to the beginning of the result, that means before the first row.
`void`	`setFetchSize(int fetchSize)` Set the fetch size for this result set.
`void`	`setLimit(int limit)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.h2.result.ResultInterface
getVisibleColumnCount

- Constructor Detail
  - LazyResult
```
public LazyResult(Expression[] expressions)
```
- Method Detail
  - setLimit
```
public void setLimit(int limit)
```
  - isLazy
```
public boolean isLazy()
```
    Description copied from interface: ResultInterface
    
    Check if this a lazy execution result.
    
    Specified by:
    
    isLazy in interface ResultInterface
    
    Returns:
    
    true if it is a lazy result
  - reset
```
public void reset()
```
    Description copied from interface: ResultInterface
    
    Go to the beginning of the result, that means before the first row.
    
    Specified by:
    
    reset in interface ResultInterface
  - currentRow
```
public Value[] currentRow()
```
    Description copied from interface: ResultInterface
    
    Get the current row.
    
    Specified by:
    
    currentRow in interface ResultInterface
    
    Returns:
    
    the row
  - next
```
public boolean next()
```
    Description copied from interface: ResultInterface
    
    Go to the next row.
    
    Specified by:
    
    next in interface ResultInterface
    
    Returns:
    
    true if a row exists
  - hasNext
```
public boolean hasNext()
```
    Description copied from interface: ResultInterface
    
    Check if this result has more rows to fetch.
    
    Specified by:
    
    hasNext in interface ResultInterface
    
    Returns:
    
    true if it has
  - fetchNextRow
```
protected abstract Value[] fetchNextRow()
```
    Fetch next row or null if none available.
    
    Returns:
    
    next row or null
  - isAfterLast
```
public boolean isAfterLast()
```
    Description copied from interface: ResultInterface
    
    Check if the current position is after last row.
    
    Specified by:
    
    isAfterLast in interface ResultInterface
    
    Returns:
    
    true if after last
  - getRowId
```
public int getRowId()
```
    Description copied from interface: ResultInterface
    
    Get the current row id, starting with 0. -1 is returned when next() was not called yet.
    
    Specified by:
    
    getRowId in interface ResultInterface
    
    Returns:
    
    the row id
  - getRowCount
```
public int getRowCount()
```
    Description copied from interface: ResultInterface
    
    Get the number of rows in this object.
    
    Specified by:
    
    getRowCount in interface ResultInterface
    
    Returns:
    
    the number of rows
  - needToClose
```
public boolean needToClose()
```
    Description copied from interface: ResultInterface
    
    Check if this result set should be closed, for example because it is buffered using a temporary file.
    
    Specified by:
    
    needToClose in interface ResultInterface
    
    Returns:
    
    true if close should be called.
  - isClosed
```
public boolean isClosed()
```
    Description copied from interface: ResultInterface
    
    Check if this result set is closed.
    
    Specified by:
    
    isClosed in interface ResultInterface
    
    Returns:
    
    true if it is
  - close
```
public void close()
```
    Description copied from interface: ResultInterface
    
    Close the result and delete any temporary files
    
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Specified by:
    
    close in interface ResultInterface
  - getAlias
```
public java.lang.String getAlias(int i)
```
    Description copied from interface: ResultInterface
    
    Get the column alias name for the column.
    
    Specified by:
    
    getAlias in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the alias name
  - getSchemaName
```
public java.lang.String getSchemaName(int i)
```
    Description copied from interface: ResultInterface
    
    Get the schema name for the column, if one exists.
    
    Specified by:
    
    getSchemaName in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the schema name or null
  - getTableName
```
public java.lang.String getTableName(int i)
```
    Description copied from interface: ResultInterface
    
    Get the table name for the column, if one exists.
    
    Specified by:
    
    getTableName in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the table name or null
  - getColumnName
```
public java.lang.String getColumnName(int i)
```
    Description copied from interface: ResultInterface
    
    Get the column name.
    
    Specified by:
    
    getColumnName in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the column name
  - getColumnType
```
public int getColumnType(int i)
```
    Description copied from interface: ResultInterface
    
    Get the column data type.
    
    Specified by:
    
    getColumnType in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the column data type
  - getColumnPrecision
```
public long getColumnPrecision(int i)
```
    Description copied from interface: ResultInterface
    
    Get the precision for this column.
    
    Specified by:
    
    getColumnPrecision in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the precision
  - getColumnScale
```
public int getColumnScale(int i)
```
    Description copied from interface: ResultInterface
    
    Get the scale for this column.
    
    Specified by:
    
    getColumnScale in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the scale
  - getDisplaySize
```
public int getDisplaySize(int i)
```
    Description copied from interface: ResultInterface
    
    Get the display size for this column.
    
    Specified by:
    
    getDisplaySize in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    the display size
  - isAutoIncrement
```
public boolean isAutoIncrement(int i)
```
    Description copied from interface: ResultInterface
    
    Check if this is an auto-increment column.
    
    Specified by:
    
    isAutoIncrement in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    true for auto-increment columns
  - getNullable
```
public int getNullable(int i)
```
    Description copied from interface: ResultInterface
    
    Check if this column is nullable.
    
    Specified by:
    
    getNullable in interface ResultInterface
    
    Parameters:
    
    i - the column number (starting with 0)
    
    Returns:
    
    Column.NULLABLE_*
  - setFetchSize
```
public void setFetchSize(int fetchSize)
```
    Description copied from interface: ResultInterface
    
    Set the fetch size for this result set.
    
    Specified by:
    
    setFetchSize in interface ResultInterface
    
    Parameters:
    
    fetchSize - the new fetch size
  - getFetchSize
```
public int getFetchSize()
```
    Description copied from interface: ResultInterface
    
    Get the current fetch size for this result set.
    
    Specified by:
    
    getFetchSize in interface ResultInterface
    
    Returns:
    
    the fetch size
  - createShallowCopy
```
public ResultInterface createShallowCopy(SessionInterface targetSession)
```
    Description copied from interface: ResultInterface
    
    Create a shallow copy of the result set. The data and a temporary table (if there is any) is not copied.
    
    Specified by:
    
    createShallowCopy in interface ResultInterface
    
    Parameters:
    
    targetSession - the session of the copy
    
    Returns:
    
    the copy if possible, or null if copying is not possible
  - containsDistinct
```
public boolean containsDistinct(Value[] values)
```
    Description copied from interface: ResultInterface
    
    Check if this result set contains the given row.
    
    Specified by:
    
    containsDistinct in interface ResultInterface
    
    Parameters:
    
    values - the row
    
    Returns:
    
    true if the row exists

Class LazyResult

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.h2.result.ResultInterface

Constructor Detail

LazyResult

Method Detail

setLimit

isLazy

reset

currentRow

next

hasNext

fetchNextRow

isAfterLast

getRowId

getRowCount

needToClose

isClosed

close

getAlias

getSchemaName

getTableName

getColumnName

getColumnType

getColumnPrecision

getColumnScale

getDisplaySize

isAutoIncrement

getNullable

setFetchSize

getFetchSize

createShallowCopy

containsDistinct