BasicCursor (celesta-parent 7.4.30-SNAPSHOT API)

java.lang.Object
- ru.curs.celesta.dbutils.CsqlBasicDataAccessor<CallContext>
- - ru.curs.celesta.dbutils.BasicDataAccessor
  - - ru.curs.celesta.dbutils.BasicCursor

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

Cursor, MaterializedViewCursor, ParameterizedViewCursor, ReadOnlyTableCursor, ViewCursor
```
public abstract class BasicCursor
extends BasicDataAccessor
```
Base cursor class for reading data from views.

Constructor Summary

Constructors
Constructor and Description

BasicCursor(CallContext context)

BasicCursor(CallContext context, Set<String> fields)

Constructors
Constructor and Description
`BasicCursor(CallContext context)`
`BasicCursor(CallContext context, Set<String> fields)`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`String`	`asCSVLine()` Returns current state of the cursor in form of CSV string with comma delimiters.
`boolean`	`canDelete()` Whether the session has rights to delete data from current table.
`boolean`	`canInsert()` Whether the session has rights to insert data into current table.
`boolean`	`canModify()` Whether the session has rights to modify data of current table.
`void`	`clear()` Resets filters, sorting and fully cleans the buffer.
`void`	`clearBuffer(boolean withKeys)` Clears current cursor buffer (sets all fields to null)
`abstract void`	`copyFieldsFrom(BasicCursor from)` Copy field values from a cursor of the same type.
`void`	`copyFiltersFrom(BasicCursor c)` Gets a copy of filters along with values of limit (offset and rowcount) from a cursor of the same type.
`void`	`copyOrderFrom(BasicCursor c)` Gets a copy of orderings from a cursor of the same type.
`int`	`count()` Returns number of records in the filtered data set.
`boolean[]`	`descOrders()` Returns mask of DESC orders.
`void`	`findSet()` Moves to the first record in the filtered data set causing an error in the case if the transition was not successful.
`void`	`first()` The same as tryFirst() but causes an error if no record is found.
`BasicCursor`	`getBufferCopy(CallContext context, List<String> fetchedFields)` Clones the current cursor.
`String`	`getComplexFilter()` Returns (reformatted) expression of the complex filter in CelestaSQL dialect.
`Object[]`	`getCurrentValues()` Returns an array of field values.
`String`	`getOrderBy()` Returns "order by" clause for the cursor.
`Object`	`getValue(String name)` Returns a value of a field by its name.
`boolean`	`isEquivalent(BasicCursor c)` Checks if filters and sorting are equivalent for this and other cursor.
`void`	`last()` The same as tryLast() but causes an error if no record is found.
`void`	`limit(long offset, long rowCount)` Sets filter to a range of records returned by the cursor.
`abstract DataGrainElement`	`meta()` Metadata object (table, view or sequence) on the basis of which current data object was created.
`boolean`	`navigate(String command)` Navigation method (step-by-step transition in the filtered and sorted data set).
`boolean`	`navigate(String command, long offset)`
`boolean`	`next()` The same as navigate(">").
`boolean`	`nextInSet()` Moves to the next record in the sorted data set.
`void`	`orderBy()` Clears sorting.
`void`	`orderBy(ColumnMeta<?>... columns)` Sets sorting.
`void`	`orderBy(String... names)` Deprecated.
`String[]`	`orderByColumnNames()` Returns column names that are in sorting.
`int`	`position()` Method that returns total count of rows that precede the current one in the set.
`boolean`	`previous()` The same as navigate("<").
`void`	`reset()` Resets filters and sorting.
`void`	`setComplexFilter(String condition)` Sets complex condition to the data set.
`void`	`setFilter(ColumnMeta<?> column, String value)` Sets filter to the field.
`void`	`setFilter(String name, String value)` Deprecated.
`void`	`setRange(ColumnMeta<?> column)` Resets any filter on a field.
`<T> void`	`setRange(ColumnMeta<? super T> column, T value)` Sets range from a single value on the field.
`<T> void`	`setRange(ColumnMeta<? super T> column, T valueFrom, T valueTo)` Sets range from..to on the field.
`void`	`setRange(String name)` Deprecated.
`void`	`setRange(String name, Object value)` Deprecated.
`void`	`setRange(String name, Object valueFrom, Object valueTo)` Deprecated.
`void`	`setValue(String name, Object value)` Sets value of a field by its name.
`boolean`	`tryFindSet()` Moves to the first record in the filtered data set and returns information about the success of transition.
`boolean`	`tryFirst()` The same as navigate("-").
`boolean`	`tryLast()` The same as navigate("+").

Methods inherited from class ru.curs.celesta.dbutils.BasicDataAccessor
canRead

Methods inherited from class ru.curs.celesta.dbutils.CsqlBasicDataAccessor
callContext, close, isClosed

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

- Constructor Detail
  - BasicCursor
```
public BasicCursor(CallContext context)
```
  - BasicCursor
```
public BasicCursor(CallContext context,
                   Set<String> fields)
```
- Method Detail
  - meta
```
public abstract DataGrainElement meta()
```
    Description copied from class: CsqlBasicDataAccessor
    
    Metadata object (table, view or sequence) on the basis of which current data object was created.
    
    Specified by:
    
    meta in class CsqlBasicDataAccessor<CallContext>
  - canInsert
```
public boolean canInsert()
```
    Whether the session has rights to insert data into current table.
    
    Returns:
    
    true, if current record can be inserted
  - canModify
```
public boolean canModify()
```
    Whether the session has rights to modify data of current table.
    
    Returns:
    
    true, if current record can be updated
  - canDelete
```
public boolean canDelete()
```
    Whether the session has rights to delete data from current table.
    
    Returns:
    
    true, if current record can be deleted
  - getOrderBy
```
public final String getOrderBy()
```
    Returns "order by" clause for the cursor.
    
    Returns:
  - orderByColumnNames
```
public String[] orderByColumnNames()
```
    Returns column names that are in sorting.
    
    Returns:
  - descOrders
```
public boolean[] descOrders()
```
    Returns mask of DESC orders.
    
    Returns:
  - tryFindSet
```
public final boolean tryFindSet()
```
    Moves to the first record in the filtered data set and returns information about the success of transition.
    
    Returns:
    
    true if the transition was successful, false if there are no records in the data set.
  - tryFirst
```
public final boolean tryFirst()
```
    The same as navigate("-").
    
    Returns:
  - first
```
public final void first()
```
    The same as tryFirst() but causes an error if no record is found.
  - tryLast
```
public final boolean tryLast()
```
    The same as navigate("+").
    
    Returns:
  - last
```
public final void last()
```
    The same as tryLast() but causes an error if no record is found.
  - next
```
public final boolean next()
```
    The same as navigate(">").
    
    Returns:
  - previous
```
public final boolean previous()
```
    The same as navigate("<").
    
    Returns:
  - findSet
```
public final void findSet()
```
    Moves to the first record in the filtered data set causing an error in the case if the transition was not successful.
  - asCSVLine
```
public final String asCSVLine()
```
    Returns current state of the cursor in form of CSV string with comma delimiters.
    
    Returns:
  - nextInSet
```
public final boolean nextInSet()
```
    Moves to the next record in the sorted data set. Returns false if the end of the set is reached.
    
    Returns:
  - navigate
```
public boolean navigate(String command)
```
    Navigation method (step-by-step transition in the filtered and sorted data set).
    Parameters:
    command - Command consisting of a sequence of symbols:
    
    = update current record (if it exists in the filtered data set)
    > move to the next record in the filtered data set
    
    < move to the previous record in the filtered data set
    
    - move to the first record in the filtered data set
    
    + move to the last record in the filtered data set
    Returns:
    
    true if the record was found and the transition completed false - otherwise.
  - navigate
```
public boolean navigate(String command,
                        long offset)
```
  - setRange
```
@Deprecated
public final void setRange(String name)
```
    Deprecated.
    
    Resets any filter on a field.
    
    Parameters:
    
    name - field name
  - setRange
```
public final void setRange(ColumnMeta<?> column)
```
    Resets any filter on a field.
    
    Parameters:
    
    column - field column
  - setRange
```
@Deprecated
public final void setRange(String name,
                                       Object value)
```
    Deprecated.
    
    Sets range from a single value on the field.
    
    Parameters:
    
    name - field name
    
    value - value along which filtering is performed
  - setRange
```
public final <T> void setRange(ColumnMeta<? super T> column,
                               T value)
```
    Sets range from a single value on the field.
    
    Type Parameters:
    
    T - Java type of value
    
    Parameters:
    
    column - field column
    
    value - value along which filtering is performed
  - setRange
```
@Deprecated
public final void setRange(String name,
                                       Object valueFrom,
                                       Object valueTo)
```
    Deprecated.
    
    Sets range from..to on the field.
    
    Parameters:
    
    name - field name
    
    valueFrom - value from
    
    valueTo - value to
  - setRange
```
public final <T> void setRange(ColumnMeta<? super T> column,
                               T valueFrom,
                               T valueTo)
```
    Sets range from..to on the field.
    
    Type Parameters:
    
    T - Java type of value
    
    Parameters:
    
    column - field column
    
    valueFrom - value from
    
    valueTo - value to
  - setFilter
```
@Deprecated
public final void setFilter(String name,
                                        String value)
```
    Deprecated.
    
    Sets filter to the field.
    
    Parameters:
    
    name - field name
    
    value - filter
  - setFilter
```
public final void setFilter(ColumnMeta<?> column,
                            String value)
```
    Sets filter to the field.
    
    Parameters:
    
    column - field column
    
    value - filter
  - setComplexFilter
```
public final void setComplexFilter(String condition)
```
    Sets complex condition to the data set.
    
    Parameters:
    
    condition - condition that corresponds to WHERE clause.
  - getComplexFilter
```
public final String getComplexFilter()
```
    Returns (reformatted) expression of the complex filter in CelestaSQL dialect.
  - limit
```
public final void limit(long offset,
                        long rowCount)
```
    Sets filter to a range of records returned by the cursor.
    
    Parameters:
    
    offset - number of records that has to be skipped (0 - start from the beginning).
    
    rowCount - maximal number of records that has to be returned (0 - return all records).
  - reset
```
public final void reset()
```
    Resets filters and sorting.
  - orderBy
```
@Deprecated
public final void orderBy(String... names)
```
    Deprecated.
    
    Sets sorting.
    
    Parameters:
    
    names - array of fields for sorting
  - orderBy
```
public final void orderBy(ColumnMeta<?>... columns)
```
    Sets sorting.
    
    Parameters:
    
    columns - columns array for sorting
  - orderBy
```
public final void orderBy()
```
    Clears sorting.
  - clear
```
public void clear()
```
    Resets filters, sorting and fully cleans the buffer.
    
    Specified by:
    
    clear in class CsqlBasicDataAccessor<CallContext>
  - count
```
public final int count()
```
    Returns number of records in the filtered data set.
    
    Returns:
  - position
```
public final int position()
```
    Method that returns total count of rows that precede the current one in the set. This method is intended for internal use by GridDriver. Since rows counting is a resource-consuming operation, usage of this method should be avoided.
    
    Returns:
  - copyFiltersFrom
```
public final void copyFiltersFrom(BasicCursor c)
```
    Gets a copy of filters along with values of limit (offset and rowcount) from a cursor of the same type.
    
    Parameters:
    
    c - cursor the filters of which have to be copied
  - copyOrderFrom
```
public final void copyOrderFrom(BasicCursor c)
```
    Gets a copy of orderings from a cursor of the same type.
    
    Parameters:
    
    c - cursor the sortings of which have to be copied
  - isEquivalent
```
public boolean isEquivalent(BasicCursor c)
```
    Checks if filters and sorting are equivalent for this and other cursor.
    
    Parameters:
    
    c - Other cursor.
    
    Returns:
  - setValue
```
public final void setValue(String name,
                           Object value)
```
    Sets value of a field by its name. This is needed for an indirect filling of the cursor with data from Java (in Python, naturally, there is setattr(...) procedure for this goal).
    
    Parameters:
    
    name - field name
    
    value - field value
  - getValue
```
public final Object getValue(String name)
```
    Returns a value of a field by its name. This is needed for accessing data when using generic cursors, such as Cursor.
    
    Parameters:
    
    name - field name
    
    Returns:
  - copyFieldsFrom
```
public abstract void copyFieldsFrom(BasicCursor from)
```
    Copy field values from a cursor of the same type.
    
    Parameters:
    
    from - cursor that field values have to be copied from
  - getCurrentValues
```
public final Object[] getCurrentValues()
```
    Returns an array of field values.
    
    Returns:
  - clearBuffer
```
public final void clearBuffer(boolean withKeys)
```
    Clears current cursor buffer (sets all fields to null)
    
    Parameters:
    
    withKeys - if true, all fields will be cleared, otherwise, primary key fields will remain unchanged.
  - getBufferCopy
```
public final BasicCursor getBufferCopy(CallContext context,
                                       List<String> fetchedFields)
```
    Clones the current cursor.
    
    Parameters:
    
    context - call context
    
    fetchedFields - list of fields to be fetched

Class BasicCursor

Constructor Summary

Method Summary

Methods inherited from class ru.curs.celesta.dbutils.BasicDataAccessor

Methods inherited from class ru.curs.celesta.dbutils.CsqlBasicDataAccessor

Methods inherited from class java.lang.Object

Constructor Detail

BasicCursor

BasicCursor

Method Detail

meta

canInsert

canModify

canDelete

getOrderBy

orderByColumnNames

descOrders

tryFindSet

tryFirst

first

tryLast

last

next

previous

findSet

asCSVLine

nextInSet

navigate

navigate

setRange

setRange

setRange

setRange

setRange

setRange

setFilter

setFilter

setComplexFilter

getComplexFilter

limit

reset

orderBy

orderBy

orderBy

clear

count

position

copyFiltersFrom

copyOrderFrom

isEquivalent

setValue

getValue

copyFieldsFrom

getCurrentValues

clearBuffer

getBufferCopy