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Java Source Code / Java Documentation » Database DBMS » h2database » org.h2.command.dml 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.h2.command.Prepared
      org.h2.command.dml.Query

All known Subclasses:   org.h2.command.dml.SelectUnion,  org.h2.command.dml.Select,
Query
abstract public class Query extends Prepared (Code)
Represents a SELECT statement (simple, or union).


Field Summary
protected  Expressionlimit
     The limit expression as specified in the LIMIT or TOP clause.
protected  Expressionoffset
     The offset expression as specified in the LIMIT ..
protected  intsampleSize
    

Constructor Summary
public  Query(Session session)
    

Method Summary
abstract public  voidaddGlobalCondition(Parameter param, int columnId, int comparisonType)
     Add a condition to the query.
 voidaddParameter(Parameter param)
    
abstract public  intgetColumnCount()
     Get the column count of this query.
abstract public  doublegetCost()
     Calculate the cost to execute this query.
abstract public  ObjectArraygetExpressions()
     The the list of select expressions.
abstract public  StringgetFirstColumnAlias(Session session)
     Get the alias (or column name) of the first column.
final public  longgetMaxDataModificationId()
    
final public  Value[]getParameterValues()
    
abstract public  HashSetgetTables()
     Get all tables that are involved in this query.
abstract public  voidinit()
     Initialize the query.
protected  voidinitOrder(ObjectArray expressions, ObjectArray expressionSQL, ObjectArray orderList, int visible, boolean mustBeInResult)
    
abstract public  booleanisEverything(ExpressionVisitor visitor)
     Check if this expression and all sub-expressions can fulfill a criteria.
final public  booleanisEverything(int expressionVisitorType)
     Visit all expressions and subqueries in this query using the visitor pattern.
public  booleanisQuery()
    
public  booleanisTransactional()
    
abstract public  voidmapColumns(ColumnResolver resolver, int level)
     Map the columns to the given column resolver.
public  SortOrderprepareOrder(ObjectArray orderList, int expressionCount)
     Create a SortOrder object given the list of SelectOrderBy objects.
public  LocalResultquery(int limit)
    
abstract  LocalResultqueryWithoutCache(int limit)
     Execute the query without checking the cache.
abstract public  voidsetDistinct(boolean b)
     Set the distinct flag.
abstract public  voidsetEvaluatable(TableFilter tableFilter, boolean b)
     Change the evaluatable flag.
abstract public  voidsetForUpdate(boolean forUpdate)
     Set the 'for update' flag.
public  voidsetLimit(Expression limit)
    
public  voidsetOffset(Expression offset)
    
abstract public  voidsetOrder(ObjectArray order)
     Set the order by list.
public  voidsetSampleSize(int sampleSize)
    
abstract public  voidupdateAggregate(Session session)
     Update all aggregate function values.

Field Detail
limit
protected Expression limit(Code)
The limit expression as specified in the LIMIT or TOP clause.



offset
protected Expression offset(Code)
The offset expression as specified in the LIMIT .. OFFSET clause.



sampleSize
protected int sampleSize(Code)
The sample size




Constructor Detail
Query
public Query(Session session)(Code)




Method Detail
addGlobalCondition
abstract public void addGlobalCondition(Parameter param, int columnId, int comparisonType) throws SQLException(Code)
Add a condition to the query. This is used for views.
Parameters:
  param - the parameter
Parameters:
  columnId - the column index (0 meaning the first column)
Parameters:
  comparisonType - the comparison type



addParameter
void addParameter(Parameter param)(Code)



getColumnCount
abstract public int getColumnCount()(Code)
Get the column count of this query. the column count



getCost
abstract public double getCost()(Code)
Calculate the cost to execute this query. the cost



getExpressions
abstract public ObjectArray getExpressions()(Code)
The the list of select expressions. This may include invisible expressions such as order by expressions. the list of expressions



getFirstColumnAlias
abstract public String getFirstColumnAlias(Session session)(Code)
Get the alias (or column name) of the first column. This is used to convert IN(SELECT ...) queries to inner joins.
Parameters:
  session - the session the alias or column name



getMaxDataModificationId
final public long getMaxDataModificationId()(Code)



getParameterValues
final public Value[] getParameterValues() throws SQLException(Code)



getTables
abstract public HashSet getTables()(Code)
Get all tables that are involved in this query. the set of tables



init
abstract public void init() throws SQLException(Code)
Initialize the query.



initOrder
protected void initOrder(ObjectArray expressions, ObjectArray expressionSQL, ObjectArray orderList, int visible, boolean mustBeInResult) throws SQLException(Code)



isEverything
abstract public boolean isEverything(ExpressionVisitor visitor)(Code)
Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.
Parameters:
  visitor - the visitor if the criteria can be fulfilled



isEverything
final public boolean isEverything(int expressionVisitorType)(Code)
Visit all expressions and subqueries in this query using the visitor pattern.
Parameters:
  expressionVisitorType - the visitor type true if no component returned false



isQuery
public boolean isQuery()(Code)



isTransactional
public boolean isTransactional()(Code)



mapColumns
abstract public void mapColumns(ColumnResolver resolver, int level) throws SQLException(Code)
Map the columns to the given column resolver.
Parameters:
  resolver - the resolver
Parameters:
  level - the subquery level (0 is the top level query, 1 is the firstsubquery level)



prepareOrder
public SortOrder prepareOrder(ObjectArray orderList, int expressionCount) throws SQLException(Code)
Create a SortOrder object given the list of SelectOrderBy objects. The expression list is extended if necessary.
Parameters:
  orderList - a list of SelectOrderBy elements
Parameters:
  expressionCount - the number of columns in the query the SortOrder object



query
public LocalResult query(int limit) throws SQLException(Code)



queryWithoutCache
abstract LocalResult queryWithoutCache(int limit) throws SQLException(Code)
Execute the query without checking the cache.
Parameters:
  limit - the limit as specified in the JDBC method call the result



setDistinct
abstract public void setDistinct(boolean b)(Code)
Set the distinct flag.
Parameters:
  b - the new value



setEvaluatable
abstract public void setEvaluatable(TableFilter tableFilter, boolean b)(Code)
Change the evaluatable flag. This is used when building the execution plan.
Parameters:
  tableFilter - the table filter
Parameters:
  b - the new value



setForUpdate
abstract public void setForUpdate(boolean forUpdate)(Code)
Set the 'for update' flag.
Parameters:
  forUpdate - the new setting



setLimit
public void setLimit(Expression limit)(Code)



setOffset
public void setOffset(Expression offset)(Code)



setOrder
abstract public void setOrder(ObjectArray order)(Code)
Set the order by list.
Parameters:
  order - the order by list



setSampleSize
public void setSampleSize(int sampleSize)(Code)



updateAggregate
abstract public void updateAggregate(Session session) throws SQLException(Code)
Update all aggregate function values.
Parameters:
  session - the session



Fields inherited from org.h2.command.Prepared
protected int headPos(Code)(Java Doc)
protected ObjectArray parameters(Code)(Java Doc)
protected boolean prepareAlways(Code)(Java Doc)
protected Session session(Code)(Java Doc)
protected String sql(Code)(Java Doc)

Methods inherited from org.h2.command.Prepared
public void checkCancelled() throws SQLException(Code)(Java Doc)
protected void checkParameters() throws SQLException(Code)(Java Doc)
public int getCurrentRowNumber()(Code)(Java Doc)
protected int getObjectId(boolean needFresh, boolean dataFile)(Code)(Java Doc)
public ObjectArray getParameters()(Code)(Java Doc)
public String getPlanSQL()(Code)(Java Doc)
public String getSQL()(Code)(Java Doc)
public boolean isQuery()(Code)(Java Doc)
public boolean isReadOnly()(Code)(Java Doc)
abstract public boolean isTransactional()(Code)(Java Doc)
public boolean needRecompile() throws SQLException(Code)(Java Doc)
public void prepare() throws SQLException(Code)(Java Doc)
public LocalResult query(int maxrows) throws SQLException(Code)(Java Doc)
abstract public LocalResult queryMeta() throws SQLException(Code)(Java Doc)
public void setCommand(Command command)(Code)(Java Doc)
protected void setCurrentRowNumber(int rowNumber)(Code)(Java Doc)
public void setHeadPos(int headPos)(Code)(Java Doc)
public void setObjectId(int i)(Code)(Java Doc)
public void setParameterList(ObjectArray parameters)(Code)(Java Doc)
public void setPrepareAlways(boolean prepareAlways)(Code)(Java Doc)
public void setSQL(String sql)(Code)(Java Doc)
public void setSession(Session currentSession)(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public int update() throws SQLException(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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