Uses of Class
com.mckoi.database.Variable

Packages that use Variable

Package	Description
com.mckoi.database	The core database classes for Mckoi.
com.mckoi.database.interpret	These classes interpret specific SQL statements, such as Insert and Delete.
com.mckoi.database.sql	These classes parse SQL statements in Mckoi.

Uses of Variable in com.mckoi.database

Methods in com.mckoi.database that return Variable

Modifier and Type	Method	Description
Variable[]	QueryPlan.SubsetNode.getNewColumnNames()	Returns the list of new column names that represent the new columns in this subset.
Variable[]	QueryPlan.SubsetNode.getOriginalColumns()	Returns the list of original columns that represent the mappings from the columns in this subset.
Variable	CompositeTable.getResolvedVariable(int column)
Variable	DataTable.getResolvedVariable(int column)
Variable	DataTableFilter.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
Variable	DefaultDataTable.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
Variable	FilterTable.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
Variable	JoinedTable.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
Variable	ReferenceTable.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
Variable	SubsetColumnTable.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
abstract Variable	Table.getResolvedVariable(int column)	Returns a fully qualified Variable object that represents the name of the column at the given index.
Variable	TableAccessState.getResolvedVariable(int column)	Returns the TableName of the given column of this table.
Variable	Assignment.getVariable()	Returns the variable for this assignment.
Variable	CorrelatedVariable.getVariable()	Returns the wrapped Variable.
Variable	Expression.getVariable()	Returns the Variable if this expression evaluates to a single variable, otherwise returns null.
static Variable	Variable.resolve(TableName tname, java.lang.String name)	Attempts to resolve a string '[table_name].[column]' to a Variable instance.
static Variable	Variable.resolve(java.lang.String name)	Attempts to resolve a string '[table_name].[column]' to a Variable instance.
Variable	Variable.resolveTableName(TableName tablen)	Returns a ColumnName that is resolved against a table name context only if the ColumnName is unknown in this object.
Variable	Variable.set(Variable from)	Sets this Variable object with information from the given Variable.

Methods in com.mckoi.database with parameters of type Variable

Modifier and Type	Method	Description
boolean	Database.canUserInsertIntoTableObject(DatabaseQueryContext context, User user, TableName table, Variable[] columns)	Returns true if the user can insert into a table or view with the given name and given columns, otherwise returns false.
boolean	Database.canUserSelectFromTableObject(DatabaseQueryContext context, User user, TableName table, Variable[] columns)	Returns true if the user can select from a table or view with the given name and given columns, otherwise returns false.
boolean	Database.canUserUpdateTableObject(DatabaseQueryContext context, User user, TableName table, Variable[] columns)	Returns true if the user can update a table or view with the given name and given columns, otherwise returns false.
void	FunctionTable.createGroupMatrix(Variable[] col_list)	Creates a grouping matrix for the given tables.
int	Table.fastFindFieldName(Variable col)	A faster way to find a column index given a string column name.
int	CompositeTable.findFieldName(Variable v)
int	DataTable.findFieldName(Variable v)
int	DataTableFilter.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
int	DefaultDataTable.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
int	FilterTable.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
int	JoinedTable.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
int	ReferenceTable.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
int	SubsetColumnTable.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
abstract int	Table.findFieldName(Variable v)	Given a fully qualified variable field name, ie.
TType	Table.getTTypeForColumn(Variable v)	Returns a TType object that would represent values in the given column.
Table	FunctionTable.mergeWithReference(Variable max_column)	Returns a Table that is this function table merged with the cross reference table.
VirtualTable	Table.orderByColumn(Variable column)
VirtualTable	Table.orderByColumn(Variable column, boolean ascending)
Table	Table.rangeSelect(Variable col_var, SelectableRange[] ranges)	A single column range select on this table.
TObject	GroupResolver.resolve(Variable variable, int set_index)	Returns the value of a variable of a group.
TObject	VariableResolver.resolve(Variable variable)	Returns the value of a given variable.
TType	VariableResolver.returnTType(Variable variable)	Returns the TType of object the given variable is.
Variable	Variable.set(Variable from)	Sets this Variable object with information from the given Variable.
void	SubsetColumnTable.setColumnMap(int[] mapping, Variable[] aliases)	Adds a column map into this table.
Table	Table.simpleJoin(QueryContext context, Table table, Variable lhs_var, Operator op, Expression rhs)	A simple join operation.
Table	Table.simpleSelect(QueryContext context, Variable lhs_var, Operator op, Expression rhs)	A simple select on this table.

Constructors in com.mckoi.database with parameters of type Variable

Constructor	Description
Assignment(Variable variable, Expression expression)	Constructs the assignment.
CorrelatedVariable(Variable variable, int level_offset)	Constructs the CorrelatedVariable.
DistinctNode(QueryPlanNode child, Variable[] columns)
EquiJoinNode(QueryPlanNode left, QueryPlanNode right, Variable[] left_cols, Variable[] right_cols)
GroupNode(QueryPlanNode child, Variable[] columns, Variable group_max_column, Expression[] function_list, java.lang.String[] name_list)	Groups over the given columns from the child.
GroupNode(QueryPlanNode child, Variable group_max_column, Expression[] function_list, java.lang.String[] name_list)	Groups over the entire child (always ends in 1 result in set).
JoinNode(QueryPlanNode left, QueryPlanNode right, Variable left_var, Operator join_op, Expression right_expression)
MultiColumnEquiSelectNode(QueryPlanNode child, Variable[] columns, Expression[] values)
NonCorrelatedAnyAllNode(QueryPlanNode left, QueryPlanNode right, Variable[] left_vars, Operator subquery_op)
SimpleSelectNode(QueryPlanNode child, Variable left_var, Operator op, Expression right_expression)
SortNode(QueryPlanNode child, Variable[] columns, boolean[] ascending)
SubsetNode(QueryPlanNode child, Variable[] original_columns, Variable[] new_column_names)
Variable(Variable v)

Uses of Variable in com.mckoi.database.interpret

Fields in com.mckoi.database.interpret declared as Variable

Modifier and Type	Field	Description
Variable	TableSelectExpression.group_max	The group max variable or null if no group max.
Variable	SelectColumn.internal_name	The name of this column used internally to reference it.
Variable	ByColumn.name	The name of the column in the 'by'.
Variable	SelectColumn.resolved_name	The fully resolved name that this column is given in the resulting table.

Methods in com.mckoi.database.interpret that return Variable

Modifier and Type	Method	Description
Variable[]	FromTableDirectSource.allColumns()
Variable[]	FromTableInterface.allColumns()	Returns an array of Variable objects that references each column available in this table set item in order from left column to right column.
Variable[]	FromTableSubQuerySource.allColumns()
Variable	FromTableDirectSource.resolveColumn(java.lang.String catalog, java.lang.String schema, java.lang.String table, java.lang.String column)
Variable	FromTableInterface.resolveColumn(java.lang.String catalog, java.lang.String schema, java.lang.String table, java.lang.String column)	Returns a Variable that is a fully resolved form of the given column in this table set.
Variable	FromTableSubQuerySource.resolveColumn(java.lang.String catalog, java.lang.String schema, java.lang.String table, java.lang.String column)
Variable	Statement.resolveVariableName(Variable v)	Given a Variable object, this will resolve the name into a column name the database understands (substitutes aliases, etc).

Methods in com.mckoi.database.interpret with parameters of type Variable

Modifier and Type	Method	Description
Variable	Statement.resolveVariableName(Variable v)	Given a Variable object, this will resolve the name into a column name the database understands (substitutes aliases, etc).

Uses of Variable in com.mckoi.database.sql

Methods in com.mckoi.database.sql that return Variable

Modifier and Type	Method	Description
Variable	SQL.ColumnNameVariable()
Variable	SQL.GroupMaxColumn()	NOTE: This is an extension, allows for us to specify a column to return the max value for each row representing a group.