IndexCondition (H2 Database Engine 2.0.0 API)

java.lang.Object
- org.h2.index.IndexCondition

```
public class IndexCondition
extends Object
```
A index condition object is made for each condition that can potentially use an index. This class does not extend expression, but in general there is one expression that maps to each index condition.

作者:

Thomas Mueller, Noel Grandin, Nicolas Fortin, Atelier SIG, IRSTV FR CNRS 24888

字段概要

字段
限定符和类型	字段和说明
`static int`	`ALWAYS_FALSE` A bit of a search mask meaning 'the condition is always false'.
`static int`	`END` A bit of a search mask meaning 'smaller or equal'.
`static int`	`EQUALITY` A bit of a search mask meaning 'equal'.
`static int`	`RANGE` A search mask meaning 'between'.
`static int`	`SPATIAL_INTERSECTS` A bit of a search mask meaning 'spatial intersection'.
`static int`	`START` A bit of a search mask meaning 'larger or equal'.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法和说明
`static IndexCondition`	`get(int compareType, ExpressionColumn column, Expression expression)` Create an index condition with the given parameters.
`Column`	`getColumn()` Get the referenced column.
`int`	`getCompareType()`
`ResultInterface`	`getCurrentResult()` Get the current result of the expression.
`Value`	`getCurrentValue(SessionLocal session)` Get the current value of the expression.
`Value[]`	`getCurrentValueList(SessionLocal session)` Get the current value list of the expression.
`Expression`	`getExpression()` Get expression.
`List<Expression>`	`getExpressionList()` Get expression list.
`Query`	`getExpressionQuery()` Get expression query.
`static IndexCondition`	`getInList(ExpressionColumn column, List<Expression> list)` Create an index condition with the compare type IN_LIST and with the given parameters.
`static IndexCondition`	`getInQuery(ExpressionColumn column, Query query)` Create an index condition with the compare type IN_QUERY and with the given parameters.
`int`	`getMask(ArrayList<IndexCondition> indexConditions)` Get the comparison bit mask.
`String`	`getSQL(int sqlFlags)` Get the SQL snippet of this comparison.
`boolean`	`isAlwaysFalse()` Check if the result is always false.
`boolean`	`isEnd()` Check if this index condition is of the type column smaller or equal to value.
`boolean`	`isEvaluatable()` Check if the expression can be evaluated.
`boolean`	`isSpatialIntersects()` Check if this index condition is of the type spatial column intersects value.
`boolean`	`isStart()` Check if this index condition is of the type column larger or equal to value.
`String`	`toString()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - EQUALITY
```
public static final int EQUALITY
```
    A bit of a search mask meaning 'equal'.
    
    另请参阅:
    
    常量字段值
  - START
```
public static final int START
```
    A bit of a search mask meaning 'larger or equal'.
    
    另请参阅:
    
    常量字段值
  - END
```
public static final int END
```
    A bit of a search mask meaning 'smaller or equal'.
    
    另请参阅:
    
    常量字段值
  - RANGE
```
public static final int RANGE
```
    A search mask meaning 'between'.
    
    另请参阅:
    
    常量字段值
  - ALWAYS_FALSE
```
public static final int ALWAYS_FALSE
```
    A bit of a search mask meaning 'the condition is always false'.
    
    另请参阅:
    
    常量字段值
  - SPATIAL_INTERSECTS
```
public static final int SPATIAL_INTERSECTS
```
    A bit of a search mask meaning 'spatial intersection'.
    
    另请参阅:
    
    常量字段值
- 方法详细资料
  - get
```
public static IndexCondition get(int compareType,
                                 ExpressionColumn column,
                                 Expression expression)
```
    Create an index condition with the given parameters.
    
    参数:
    
    compareType - the comparison type, see constants in Comparison
    
    column - the column
    
    expression - the expression
    
    返回:
    
    the index condition
  - getInList
```
public static IndexCondition getInList(ExpressionColumn column,
                                       List<Expression> list)
```
    Create an index condition with the compare type IN_LIST and with the given parameters.
    
    参数:
    
    column - the column
    
    list - the expression list
    
    返回:
    
    the index condition
  - getInQuery
```
public static IndexCondition getInQuery(ExpressionColumn column,
                                        Query query)
```
    Create an index condition with the compare type IN_QUERY and with the given parameters.
    
    参数:
    
    column - the column
    
    query - the select statement
    
    返回:
    
    the index condition
  - getCurrentValue
```
public Value getCurrentValue(SessionLocal session)
```
    Get the current value of the expression.
    
    参数:
    
    session - the session
    
    返回:
    
    the value
  - getCurrentValueList
```
public Value[] getCurrentValueList(SessionLocal session)
```
    Get the current value list of the expression. The value list is of the same type as the column, distinct, and sorted.
    
    参数:
    
    session - the session
    
    返回:
    
    the value list
  - getCurrentResult
```
public ResultInterface getCurrentResult()
```
    Get the current result of the expression. The rows may not be of the same type, therefore the rows may not be unique.
    
    返回:
    
    the result
  - getSQL
```
public String getSQL(int sqlFlags)
```
    Get the SQL snippet of this comparison.
    
    参数:
    
    sqlFlags - formatting flags
    
    返回:
    
    the SQL snippet
  - getMask
```
public int getMask(ArrayList<IndexCondition> indexConditions)
```
    Get the comparison bit mask.
    
    参数:
    
    indexConditions - all index conditions
    
    返回:
    
    the mask
  - isAlwaysFalse
```
public boolean isAlwaysFalse()
```
    Check if the result is always false.
    
    返回:
    
    true if the result will always be false
  - isStart
```
public boolean isStart()
```
    Check if this index condition is of the type column larger or equal to value.
    
    返回:
    
    true if this is a start condition
  - isEnd
```
public boolean isEnd()
```
    Check if this index condition is of the type column smaller or equal to value.
    
    返回:
    
    true if this is a end condition
  - isSpatialIntersects
```
public boolean isSpatialIntersects()
```
    Check if this index condition is of the type spatial column intersects value.
    
    返回:
    
    true if this is a spatial intersects condition
  - getCompareType
```
public int getCompareType()
```
  - getColumn
```
public Column getColumn()
```
    Get the referenced column.
    
    返回:
    
    the column
  - getExpression
```
public Expression getExpression()
```
    Get expression.
    
    返回:
    
    Expression.
  - getExpressionList
```
public List<Expression> getExpressionList()
```
    Get expression list.
    
    返回:
    
    Expression list.
  - getExpressionQuery
```
public Query getExpressionQuery()
```
    Get expression query.
    
    返回:
    
    Expression query.
  - isEvaluatable
```
public boolean isEvaluatable()
```
    Check if the expression can be evaluated.
    
    返回:
    
    true if it can be evaluated
  - toString
```
public String toString()
```
    覆盖:
    
    toString 在类中 Object

类 IndexCondition

字段概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

EQUALITY

START

END

RANGE

ALWAYS_FALSE

SPATIAL_INTERSECTS

方法详细资料

get

getInList

getInQuery

getCurrentValue

getCurrentValueList

getCurrentResult

getSQL

getMask

isAlwaysFalse

isStart

isEnd

isSpatialIntersects

getCompareType

getColumn

getExpression

getExpressionList

getExpressionQuery

isEvaluatable

toString