Class DMLStatementNode
- java.lang.Object
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- org.apache.derby.impl.sql.compile.QueryTreeNode
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- org.apache.derby.impl.sql.compile.StatementNode
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- org.apache.derby.impl.sql.compile.DMLStatementNode
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- All Implemented Interfaces:
Visitable
- Direct Known Subclasses:
CallStatementNode
,CursorNode
,DMLModStatementNode
abstract class DMLStatementNode extends StatementNode
A DMLStatementNode represents any type of DML statement: a cursor declaration, an INSERT statement, and UPDATE statement, or a DELETE statement. All DML statements have result sets, but they do different things with them. A SELECT statement sends its result set to the client, an INSERT statement inserts its result set into a table, a DELETE statement deletes from a table the rows corresponding to the rows in its result set, and an UPDATE statement updates the rows in a base table corresponding to the rows in its result set.
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Field Summary
Fields Modifier and Type Field Description (package private) ResultSetNode
resultSet
The result set is the rows that result from running the statement.-
Fields inherited from class org.apache.derby.impl.sql.compile.StatementNode
EMPTY_TD_LIST, NEED_CURSOR_ACTIVATION, NEED_DDL_ACTIVATION, NEED_NOTHING_ACTIVATION, NEED_PARAM_ACTIVATION, NEED_ROW_ACTIVATION
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Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
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Constructor Summary
Constructors Constructor Description DMLStatementNode(ResultSetNode resultSet, ContextManager cm)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) void
acceptChildren(Visitor v)
Accept the visitor for all visitable children of this node.(package private) int
activationKind()
Returns the type of activation this class generates.(package private) QueryTreeNode
bind(DataDictionary dataDictionary)
Bind this DMLStatementNode.protected void
bindExpressions()
Bind the expressions in this DML statement.protected void
bindExpressionsWithTables()
Bind the expressions in the underlying ResultSets with tables.(package private) QueryTreeNode
bindResultSetsWithTables(DataDictionary dataDictionary)
Bind only the underlying ResultSets with tables.protected void
bindTables(DataDictionary dataDictionary)
Bind the tables in this DML statement.(package private) void
generateParameterValueSet(ActivationClassBuilder acb)
Generate the code to create the ParameterValueSet, if necessary, when constructing the activation.(package private) int
getPrivType()
Return default privilege needed for this node.(package private) ResultSetNode
getResultSetNode()
Get the ResultSetNode from this DML Statement.boolean
isAtomic()
A read statement is atomic (DMLMod overrides us) if there are no work units, and no SELECT nodes, or if its SELECT nodes are all arguments to a function.ResultDescription
makeResultDescription()
Make a ResultDescription for use in a PreparedStatement.void
optimizeStatement()
Optimize a DML statement (which is the only type of statement that should need optimizing, I think).(package private) void
printSubNodes(int depth)
Prints the sub-nodes of this object.-
Methods inherited from class org.apache.derby.impl.sql.compile.StatementNode
bindStatement, executeSchemaName, executeStatementName, generate, getCursorInfo, getSPSName, lockTableForCompilation, needsSavepoint, statementToString, toString, updateIndexStatisticsFor
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Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
accept, addTag, addUDTUsagePriv, addUDTUsagePriv, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, copyTagsFrom, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, generate, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContext, getContextManager, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getLongProperty, getNullNode, getOffsetOrderedNodes, getOptimizerFactory, getOptimizerTracer, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, getUDTDesc, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, optimizerTracingIsOn, orReliability, parseSearchCondition, parseStatement, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist
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Field Detail
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resultSet
ResultSetNode resultSet
The result set is the rows that result from running the statement. What this means for SELECT statements is fairly obvious. For a DELETE, there is one result column representing the key of the row to be deleted (most likely, the location of the row in the underlying heap). For an UPDATE, the row consists of the key of the row to be updated plus the updated columns. For an INSERT, the row consists of the new column values to be inserted, with no key (the system generates a key). The parser doesn't know anything about keys, so the columns representing the keys will be added after parsing (perhaps in the binding phase?).
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Constructor Detail
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DMLStatementNode
DMLStatementNode(ResultSetNode resultSet, ContextManager cm)
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Method Detail
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printSubNodes
void printSubNodes(int depth)
Prints the sub-nodes of this object. See QueryTreeNode.java for how tree printing is supposed to work.- Overrides:
printSubNodes
in classQueryTreeNode
- Parameters:
depth
- The depth of this node in the tree
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getResultSetNode
ResultSetNode getResultSetNode()
Get the ResultSetNode from this DML Statement. (Useful for view resolution after parsing the view definition.)- Returns:
- ResultSetNode The ResultSetNode from this DMLStatementNode.
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bind
QueryTreeNode bind(DataDictionary dataDictionary) throws StandardException
Bind this DMLStatementNode. This means looking up tables and columns and getting their types, and figuring out the result types of all expressions, as well as doing view resolution, permissions checking, etc.- Parameters:
dataDictionary
- The DataDictionary to use to look up columns, tables, etc.- Returns:
- The bound query tree
- Throws:
StandardException
- Thrown on error
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bindResultSetsWithTables
QueryTreeNode bindResultSetsWithTables(DataDictionary dataDictionary) throws StandardException
Bind only the underlying ResultSets with tables. This is necessary for INSERT, where the binding order depends on the underlying ResultSets. This means looking up tables and columns and getting their types, and figuring out the result types of all expressions, as well as doing view resolution, permissions checking, etc.- Parameters:
dataDictionary
- The DataDictionary to use to look up columns, tables, etc.- Returns:
- The bound query tree
- Throws:
StandardException
- Thrown on error
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bindTables
protected void bindTables(DataDictionary dataDictionary) throws StandardException
Bind the tables in this DML statement.- Parameters:
dataDictionary
- The data dictionary to use to look up the tables- Throws:
StandardException
- Thrown on error
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bindExpressions
protected void bindExpressions() throws StandardException
Bind the expressions in this DML statement.- Throws:
StandardException
- Thrown on error
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bindExpressionsWithTables
protected void bindExpressionsWithTables() throws StandardException
Bind the expressions in the underlying ResultSets with tables.- Throws:
StandardException
- Thrown on error
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activationKind
int activationKind()
Returns the type of activation this class generates.- Specified by:
activationKind
in classStatementNode
- Returns:
- either (NEED_ROW_ACTIVATION | NEED_PARAM_ACTIVATION) or (NEED_ROW_ACTIVATION) depending on params
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optimizeStatement
public void optimizeStatement() throws StandardException
Optimize a DML statement (which is the only type of statement that should need optimizing, I think). This method over-rides the one in QueryTreeNode. This method takes a bound tree, and returns an optimized tree. It annotates the bound tree rather than creating an entirely new tree. Throws an exception if the tree is not bound, or if the binding is out of date.- Overrides:
optimizeStatement
in classStatementNode
- Throws:
StandardException
- Thrown on error
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makeResultDescription
public ResultDescription makeResultDescription()
Make a ResultDescription for use in a PreparedStatement. ResultDescriptions are visible to JDBC only for cursor statements. For other types of statements, they are only used internally to get descriptions of the base tables being affected. For example, for an INSERT statement, the ResultDescription describes the rows in the table being inserted into, which is useful when the values being inserted are of a different type or length than the columns in the base table.- Overrides:
makeResultDescription
in classStatementNode
- Returns:
- A ResultDescription for this DML statement
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generateParameterValueSet
void generateParameterValueSet(ActivationClassBuilder acb) throws StandardException
Generate the code to create the ParameterValueSet, if necessary, when constructing the activation. Also generate the code to call a method that will throw an exception if we try to execute without all the parameters being set.- Parameters:
acb
- The ActivationClassBuilder for the class we're building- Throws:
StandardException
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isAtomic
public boolean isAtomic() throws StandardException
A read statement is atomic (DMLMod overrides us) if there are no work units, and no SELECT nodes, or if its SELECT nodes are all arguments to a function. This is admittedly a bit simplistic, what if someone has:VALUES myfunc(SELECT max(c.commitFunc()) FROM T)
but we aren't going too far out of our way to catch every possible wierd case. We basically want to be permissive w/o allowing someone to partially commit a write.- Overrides:
isAtomic
in classStatementNode
- Returns:
- true if the statement is atomic
- Throws:
StandardException
- on error
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acceptChildren
void acceptChildren(Visitor v) throws StandardException
Accept the visitor for all visitable children of this node.- Overrides:
acceptChildren
in classQueryTreeNode
- Parameters:
v
- the visitor- Throws:
StandardException
- on error
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getPrivType
int getPrivType()
Return default privilege needed for this node. Other DML nodes can override this method to set their own default privilege.- Returns:
- true if the statement is atomic
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