org.eigenbase.sql
Class SqlUpdate

java.lang.Object
  org.eigenbase.sql.SqlNode
      org.eigenbase.sql.SqlCall
          org.eigenbase.sql.SqlUpdate

All Implemented Interfaces:

Cloneable

public class SqlUpdate
extends SqlCall

A SqlUpdate is a node of a parse tree which represents an UPDATE statement.

Field Summary

static int	ALIAS_OPERAND
static int	CONDITION_OPERAND
static int	OPERAND_COUNT
static int	SOURCE_EXPRESSION_LIST_OPERAND
static int	SOURCE_SELECT_OPERAND
static int	TARGET_COLUMN_LIST_OPERAND
static int	TARGET_TABLE_OPERAND

Fields inherited from class org.eigenbase.sql.SqlCall

operands

Fields inherited from class org.eigenbase.sql.SqlNode

emptyArray

Constructor Summary

SqlUpdate(SqlSpecialOperator operator, SqlIdentifier targetTable, SqlNodeList targetColumnList, SqlNodeList sourceExpressionList, SqlNode condition, SqlIdentifier alias, SqlParserPos pos)

Method Summary

SqlIdentifier	getAlias()
SqlNode	getCondition() Gets the filter condition for rows to be updated.
SqlNodeList	getSourceExpressionList()
SqlSelect	getSourceSelect() Gets the source SELECT expression for the data to be updated.
SqlNodeList	getTargetColumnList()
SqlIdentifier	getTargetTable()
void	unparse(SqlWriter writer, int leftPrec, int rightPrec) Writes a SQL representation of this node to a writer.
void	validate(SqlValidator validator, SqlValidatorScope scope) Validates this call.

Methods inherited from class org.eigenbase.sql.SqlCall

accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getKind, getMonotonicity, getOperands, getOperator, isA, isCountStar, isExpanded, isName, setOperand, setOperator

Methods inherited from class org.eigenbase.sql.SqlNode

clone, cloneArray, equalDeep, getParserPosition, toSqlString, toSqlString, toString, validateExpr

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TARGET_TABLE_OPERAND

public static final int TARGET_TABLE_OPERAND

See Also:

Constant Field Values

SOURCE_EXPRESSION_LIST_OPERAND

public static final int SOURCE_EXPRESSION_LIST_OPERAND

See Also:

Constant Field Values

TARGET_COLUMN_LIST_OPERAND

public static final int TARGET_COLUMN_LIST_OPERAND

See Also:

Constant Field Values

CONDITION_OPERAND

public static final int CONDITION_OPERAND

See Also:

Constant Field Values

SOURCE_SELECT_OPERAND

public static final int SOURCE_SELECT_OPERAND

See Also:

Constant Field Values

ALIAS_OPERAND

public static final int ALIAS_OPERAND

See Also:

Constant Field Values

OPERAND_COUNT

public static final int OPERAND_COUNT

See Also:

Constant Field Values

Constructor Detail

SqlUpdate

public SqlUpdate(SqlSpecialOperator operator,
                 SqlIdentifier targetTable,
                 SqlNodeList targetColumnList,
                 SqlNodeList sourceExpressionList,
                 SqlNode condition,
                 SqlIdentifier alias,
                 SqlParserPos pos)

Method Detail

getTargetTable

public SqlIdentifier getTargetTable()

Returns:

the identifier for the target table of the update

getAlias

public SqlIdentifier getAlias()

Returns:

the alias for the target table of the update

getTargetColumnList

public SqlNodeList getTargetColumnList()

Returns:

the list of target column names

getSourceExpressionList

public SqlNodeList getSourceExpressionList()

Returns:

the list of source expressions

getCondition

public SqlNode getCondition()

Gets the filter condition for rows to be updated.

Returns:

the condition expression for the data to be updated, or null for all rows in the table

getSourceSelect

public SqlSelect getSourceSelect()

Gets the source SELECT expression for the data to be updated. Returns null before the statement has been expanded by SqlValidator.performUnconditionalRewrites.

Returns:

the source SELECT for the data to be updated

unparse

public void unparse(SqlWriter writer,
                    int leftPrec,
                    int rightPrec)

Description copied from class: SqlNode

Writes a SQL representation of this node to a writer.

The leftPrec and rightPrec parameters give us enough context to decide whether we need to enclose the expression in parentheses. For example, we need parentheses around "2 + 3" if preceded by "5 *". This is because the precedence of the "*" operator is greater than the precedence of the "+" operator.

The algorithm handles left- and right-associative operators by giving them slightly different left- and right-precedence.

If SqlWriter.isAlwaysUseParentheses() is true, we use parentheses even when they are not required by the precedence rules.

For the details of this algorithm, see SqlCall.unparse(org.eigenbase.sql.SqlWriter, int, int).

Overrides:

unparse in class SqlCall

Parameters:

writer - Target writer

leftPrec - The precedence of the SqlNode immediately preceding this node in a depth-first scan of the parse tree

rightPrec - The precedence of the SqlNode immediately

validate

public void validate(SqlValidator validator,
                     SqlValidatorScope scope)

Description copied from class: SqlCall

Validates this call.

The default implementation delegates the validation to the operator's SqlOperator.validateCall(org.eigenbase.sql.SqlCall, org.eigenbase.sql.validate.SqlValidator, org.eigenbase.sql.validate.SqlValidatorScope, org.eigenbase.sql.validate.SqlValidatorScope). Derived classes may override (as do, for example SqlSelect and SqlUpdate).

Overrides:

validate in class SqlCall

scope - Validator