IndexColumn (H2 Database Engine 2.0.0 API)

java.lang.Object
- org.h2.table.IndexColumn

```
public class IndexColumn
extends Object
```
This represents a column item of an index. This is required because some indexes support descending sorted columns.

字段概要

字段
限定符和类型	字段和说明
`Column`	`column` The column, or null if not set.
`String`	`columnName` The column name.
`int`	`sortType` The sort type.
`static int`	`SQL_NO_ORDER` Do not append ordering.

构造器概要

构造器
构造器和说明
`IndexColumn(Column column)` Creates a new instance with the specified column.
`IndexColumn(String columnName)` Creates a new instance with the specified name.
`IndexColumn(String columnName, int sortType)` Creates a new instance with the specified name.

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
`StringBuilder`	`getSQL(StringBuilder builder, int sqlFlags)` Appends the SQL snippet for this index column to the specified string builder.
`static void`	`mapColumns(IndexColumn[] indexColumns, Table table)` Map the columns using the column names and the specified table.
`String`	`toString()`
`static IndexColumn[]`	`wrap(Column[] columns)` Create an array of index columns from a list of columns.
`static StringBuilder`	`writeColumns(StringBuilder builder, IndexColumn[] columns, int sqlFlags)` Appends the specified columns to the specified builder.
`static StringBuilder`	`writeColumns(StringBuilder builder, IndexColumn[] columns, int startOffset, int endOffset, int sqlFlags)` Appends the specified columns to the specified builder.
`static StringBuilder`	`writeColumns(StringBuilder builder, IndexColumn[] columns, String separator, String suffix, int sqlFlags)` Appends the specified columns to the specified builder.

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
  - SQL_NO_ORDER
```
public static final int SQL_NO_ORDER
```
    Do not append ordering.
    
    另请参阅:
    
    常量字段值
  - columnName
```
public final String columnName
```
    The column name.
  - column
```
public Column column
```
    The column, or null if not set.
  - sortType
```
public int sortType
```
    The sort type. Ascending (the default) and descending are supported; nulls can be sorted first or last.
- 构造器详细资料
  - IndexColumn
```
public IndexColumn(String columnName)
```
    Creates a new instance with the specified name.
    
    参数:
    
    columnName - the column name
  - IndexColumn
```
public IndexColumn(String columnName,
                   int sortType)
```
    Creates a new instance with the specified name.
    
    参数:
    
    columnName - the column name
    
    sortType - the sort type
  - IndexColumn
```
public IndexColumn(Column column)
```
    Creates a new instance with the specified column.
    
    参数:
    
    column - the column
- 方法详细资料
  - writeColumns
```
public static StringBuilder writeColumns(StringBuilder builder,
                                         IndexColumn[] columns,
                                         int sqlFlags)
```
    Appends the specified columns to the specified builder.
    
    参数:
    
    builder - string builder
    
    columns - index columns
    
    sqlFlags - formatting flags
    
    返回:
    
    the specified string builder
  - writeColumns
```
public static StringBuilder writeColumns(StringBuilder builder,
                                         IndexColumn[] columns,
                                         int startOffset,
                                         int endOffset,
                                         int sqlFlags)
```
    Appends the specified columns to the specified builder.
    
    参数:
    
    builder - string builder
    
    startOffset - start offset, inclusive
    
    endOffset - end offset, exclusive
    
    columns - index columns
    
    sqlFlags - formatting flags
    
    返回:
    
    the specified string builder
  - writeColumns
```
public static StringBuilder writeColumns(StringBuilder builder,
                                         IndexColumn[] columns,
                                         String separator,
                                         String suffix,
                                         int sqlFlags)
```
    Appends the specified columns to the specified builder.
    
    参数:
    
    builder - string builder
    
    columns - index columns
    
    separator - separator
    
    suffix - additional SQL to append after each column
    
    sqlFlags - formatting flags
    
    返回:
    
    the specified string builder
  - getSQL
```
public StringBuilder getSQL(StringBuilder builder,
                            int sqlFlags)
```
    Appends the SQL snippet for this index column to the specified string builder.
    
    参数:
    
    builder - string builder
    
    sqlFlags - formatting flags
    
    返回:
    
    the specified string builder
  - wrap
```
public static IndexColumn[] wrap(Column[] columns)
```
    Create an array of index columns from a list of columns. The default sort type is used.
    
    参数:
    
    columns - the column list
    
    返回:
    
    the index column array
  - mapColumns
```
public static void mapColumns(IndexColumn[] indexColumns,
                              Table table)
```
    Map the columns using the column names and the specified table.
    
    参数:
    
    indexColumns - the column list with column names set
    
    table - the table from where to map the column names to columns
  - toString
```
public String toString()
```
    覆盖:
    
    toString 在类中 Object

类 IndexColumn

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

SQL_NO_ORDER

columnName

column

sortType

构造器详细资料

IndexColumn

IndexColumn

IndexColumn

方法详细资料

writeColumns

writeColumns

writeColumns

getSQL

wrap

mapColumns

toString