Glassfish example source code file (SelectStatement.java)
The Glassfish SelectStatement.java source code/*
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/*
* SelectStatement.java
*
* Created on October 3, 2001
*
*/
package com.sun.jdo.spi.persistence.support.sqlstore.sql.generator;
import org.netbeans.modules.dbschema.ColumnElement;
import com.sun.jdo.api.persistence.support.JDOFatalDataStoreException;
import com.sun.jdo.api.persistence.support.JDOFatalInternalException;
import com.sun.jdo.spi.persistence.support.sqlstore.ActionDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.ValueFetcher;
import com.sun.jdo.spi.persistence.support.sqlstore.database.DBVendorType;
import com.sun.jdo.spi.persistence.support.sqlstore.model.TableDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.RetrieveDescImpl;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.constraint.ConstraintField;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.constraint.ConstraintFieldDesc;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.constraint.ConstraintNode;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.constraint.ConstraintOperation;
import com.sun.jdo.spi.persistence.support.sqlstore.sql.constraint.ConstraintJoin;
import org.glassfish.persistence.common.I18NHelper;
import java.util.ArrayList;
import java.util.List;
import java.sql.SQLException;
/**
* This class generates select statements.
*/
public class SelectStatement extends Statement {
/** Flag indicating if this statement has been joined. */
private boolean isJoined;
private StringBuffer orderClause = new StringBuffer();
/** SelectQueryplan */
SelectQueryPlan plan;
public SelectStatement(DBVendorType vendorType, SelectQueryPlan plan) {
super(vendorType);
this.plan = plan;
constraint = plan.getConstraint();
}
public boolean isJoined() {
return isJoined;
}
public void markJoined() {
isJoined = true;
}
public ColumnRef addColumn(ColumnElement columnElement,
QueryTable queryTable) {
ColumnRef columnRef = null;
if ((columnRef = getColumnRef(columnElement)) == null) {
columnRef = new ColumnRef(columnElement, queryTable);
addColumnRef(columnRef);
}
return columnRef;
}
public void copyColumns(SelectStatement sourceStatement) {
ArrayList columnRefs = sourceStatement.getColumnRefs();
int index = columns.size() + 1;
for (int i = 0; i < columnRefs.size(); i++) {
//addColumnRef((ColumnRef) columnRefs.get(i));
ColumnRef cref = (ColumnRef) columnRefs.get(i);
cref.setIndex(index + i);
columns.add(cref);
}
}
protected boolean isUpdateLockRequired(QueryTable table) {
return (plan.options & RetrieveDescImpl.OPT_AGGREGATE) == 0
&& table.getTableDesc().isUpdateLockRequired();
}
public void appendTableText(StringBuffer text, QueryTable table) {
super.appendTableText(text, table);
if (isUpdateLockRequired(table)) {
//Append eqivalent of "with (updlock)" to the table text
text.append(vendorType.getHoldlock() );
//For efficiency, the test whether a database is capable of supporting
//holdlock would be made in method getText() where we generate
//text corresponding to vendorType.getForUpdate()
}
}
/**
* Determines if Column Type definition is needed for this statement.
* Column Type definition is a performance optimization that allows defining
* Column Type for the resultset.
* If the query to be executed is counting pc instances, the column used
* inside COUNT() is one of the pk columns. If the pk column happens to be
* not convertable to an int (for example timestamp), database will throw an
* exception. To prevent this situation, column type definition should not
* be performed on such queries.
*
* @return true if column type definition is needed, false otherwise.
*/
public boolean isColumnTypeDefinitionNeeded() {
return (plan.options & RetrieveDescImpl.OPT_COUNT_PC ) == 0;
}
/** @inheritDoc */
public QueryPlan getQueryPlan() {
return plan;
}
/**
* @inheritDoc
*/
protected void generateStatementText() {
// Because join conditions for ANSI outer joins end up in the
// from clause, the constraint stack has to be processed before we
// generate the from clause.
StringBuffer constraints = processConstraints();
StringBuffer outerJoinText = processOuterJoinConstraints();
if (outerJoinText != null && outerJoinText.length() > 0) {
if (constraints.length() > 0 ) {
constraints.append(" and ");
}
constraints.append(outerJoinText);
}
StringBuffer whereClause = new StringBuffer();
if (constraints.length() > 0 ) {
whereClause.append(" where ").append(constraints);
}
if ((plan.options & RetrieveDescImpl.OPT_COUNT_PC) == 0) {
generateRegularStatementText(whereClause);
} else {
generateCountStatementText(whereClause);
}
}
/**
* Generates the statement text for a "regular" select query.
* Count queries have to get special attention in case of objects
* with composite primary key.
*
* @param whereClause Query's where clause.
* @see #generateCountStatementText
*/
private void generateRegularStatementText(StringBuffer whereClause) {
statementText = new StringBuffer();
StringBuffer columnText = generateColumnText();
String tableListText = generateTableListText();
String aggregateText = getAggregateText();
String aggregateEnd = (aggregateText.length() > 0) ? ")" : ""; // NOI18N
if (orderClause.length() > 0) {
orderClause.insert(0, " order by ");
}
final boolean updateLockRequired = isUpdateLockRequired();
StringBuffer forUpdateClause = generateForUpdateClause(updateLockRequired);
String distinctText = getDistinctText(updateLockRequired);
// Create the query filling in the column list, table name, etc.
statementText.append("select "). // NOI18N
append(aggregateText).append(distinctText).append(columnText).append(aggregateEnd).
append(" from ").append(tableListText). // NOI18N
append(whereClause).append(orderClause).append(forUpdateClause);
}
/**
* Generates the statement text for a count query. Count queries
* on persistence capable objects have been mapped to selecting the
* primary key columns in
* {@link SelectQueryPlan#addFetchGroups(int, ArrayList, ArrayList)}.
* Queries w/o a distinct restriction can be relaxed to select only
* one of the primary key columns. Distinct queries on objects with
* composite primary key have to be treated special to avoid duplicates.
*
* @param whereClause Query's where clause.
* @see #generateCorrelatedExistsText
*/
private void generateCountStatementText(StringBuffer whereClause) {
final int selectedColumns = columns.size();
if (selectedColumns == 1) {
// Single PK. Call regular statement generation.
generateRegularStatementText(whereClause);
} else {
boolean oneTable = tableList.size() == 1;
if ((plan.options & RetrieveDescImpl.OPT_DISTINCT) == 0
|| oneTable) {
// Without DISTINCT or when querying just one table, we can
// select only one of the pk columns and get the correct result.
// Remove the rest.
for (int i = selectedColumns; i > 1; ) { columns.remove(--i); }
if (oneTable) {
// When selecting only one table, remove the DISTINCT
// contraint from the query options to get all rows.
plan.options &= ~RetrieveDescImpl.OPT_DISTINCT;
}
// Now call regular statement generation.
generateRegularStatementText(whereClause);
} else {
// This is a distinct count on objects having a composite pk and the query
// includes join constraints. We map this to a correlated exists query.
// Note: columns can only be cleared after this call.
generateCorrelatedExistsText(whereClause);
// Since we're not selecting any columns in this query, remove all column
// information. Oracle's special DB operation code gets confused otherwise.
// See OracleSpecialDBOperation#defineColumnTypeForResult(Statement, List)
columns.clear();
}
}
}
/**
* Generates the text for a correlated exists query. Count distinct queries on
* objects with composite primary key are mapped to a correlated exists query.
* The "outer" select on the primary table to is correlated
* to the "inner" select by the already generated where clause.
*
* @param whereClause Query's where clause.
*/
private void generateCorrelatedExistsText(StringBuffer whereClause) {
statementText = new StringBuffer();
// TODO: Use correlated exists subquery in SelectQueryPlan?
// - Do we handle secondary tables correctly?
// - Do we need order by and for update clauses?
// Generate for update clause while we still have all tables in tableList
boolean updateLockRequired = isUpdateLockRequired();
StringBuffer forUpdateClause = generateForUpdateClause(updateLockRequired);
StringBuffer primaryTableText = new StringBuffer();
QueryTable primaryTable = generatePrimaryTableText(primaryTableText);
// Prepare the generation of the correlated "inner" select clause by
// removing the primary table from the table list.
// As count queries are never generated internally, we're preparing
// a user query here. User queries never have outer joins. It's safe
// remove the table from tableList.
tableList.remove(primaryTable);
String tableListText = generateTableListText();
// Create the query with the previous generated parts.
statementText.append("select count(*) from "). // NOI18N
append(primaryTableText).
append(" where exists (select * from "). // NOI18N
append(tableListText).append(whereClause).append(")"). //NOI18N
append(forUpdateClause);
}
/**
* Generates the table text for the first column of the column list.
*
* @param primaryTableText Takes the resulting statement text.
* @return The table from the first selected column.
*/
private QueryTable generatePrimaryTableText(StringBuffer primaryTableText) {
// Get the primary table from the first selected column.
// TODO: Is the first column always mapped to the primary table?
QueryTable primaryTable = ((ColumnRef)columns.get(0)).getQueryTable();
// Generate the table text.
appendTableText(primaryTableText, primaryTable);
return primaryTable;
}
protected StringBuffer generateColumnText() {
StringBuffer columnText = new StringBuffer();
for (int i = 0; i < columns.size(); i++) {
ColumnRef cr = (ColumnRef) columns.get(i);
columnText.append("t").append(cr.getQueryTable().getTableIndex()).append("."); // NOI18N
appendQuotedText(columnText, cr.getName());
columnText.append(", "); // NOI18N
}
columnText.delete(columnText.length() - 2, columnText.length());
return columnText;
}
private String getAggregateText() {
int aggregateOption = plan.options & RetrieveDescImpl.OPT_AGGREGATE;
switch (aggregateOption) {
case RetrieveDescImpl.OPT_AVG:
return "AVG( "; // NOI18N
case RetrieveDescImpl.OPT_MIN:
return "MIN("; // NOI18N
case RetrieveDescImpl.OPT_MAX:
return "MAX("; // NOI18N
case RetrieveDescImpl.OPT_SUM:
return "SUM("; // NOI18N
case RetrieveDescImpl.OPT_COUNT:
case RetrieveDescImpl.OPT_COUNT_PC:
return "COUNT("; // NOI18N
default:
return ""; // NOI18N
}
}
private StringBuffer generateForUpdateClause(boolean updateLockRequired) {
StringBuffer forUpdateClause = new StringBuffer();
if (updateLockRequired) {
// Check if vendor actually supports updatelock
if (!vendorType.isUpdateLockSupported() ) {
// Throw an exception user wanted to have update lock
// But vendor is not supporting it. Do not allow user to proceed
throw new JDOFatalDataStoreException(I18NHelper.getMessage(messages,
"sqlstore.selectstatement.noupdatelocksupport"));// NOI18N
}
// generating the ForUpdate Clause
String vendorForUpdate = vendorType.getForUpdate().trim();
boolean vendorHasForUpdateClause = (vendorForUpdate.length() != 0);
if (vendorHasForUpdateClause) {
forUpdateClause.append(" ").append(vendorForUpdate).append(" ");
if (vendorType.isLockColumnListSupported()) {
for (int i = 0; i < tableList.size(); i++) {
QueryTable queryTable = (QueryTable) tableList.get(i);
if (isUpdateLockRequired(queryTable)) {
TableDesc tableDesc = queryTable.getTableDesc();
//Get the first column of primary key
ColumnElement ce = (ColumnElement) tableDesc.getKey().getColumns().get(0);
forUpdateClause.append("t").append(i).append("."); // NOI18N
appendQuotedText(forUpdateClause, ce.getName().getName());
forUpdateClause.append(", "); // NOI18N
}
}
// Remove trailing ", "
forUpdateClause.delete(forUpdateClause.length() - 2, forUpdateClause.length());
}
}
}
return forUpdateClause;
}
private String getDistinctText(boolean updateLockRequired) {
String distinctText = ""; // NOI18N
if ((plan.options & RetrieveDescImpl.OPT_DISTINCT) > 0) {
if( !updateLockRequired || vendorType.isDistinctSupportedWithUpdateLock()) {
//Include DISTINCT only if update lock is not required
//If update lock is required, include DISTINCT only if vendor supports update lock with DISTINCT
//(e.g. ORACLE throws ORA-01786 if DISTINCT and FOR UPDATE are used in same query
//For the case where update lock is required and vendor does not support DISTINCT/
//with update lock, we would do DISTINCT in our code after retrieving the data
//see SQLStoreManger::retrieve()
distinctText = "distinct "; // NOI18N
}
}
return distinctText;
}
/**
* Determines if an update lock is required while executing this query.
*
* @return True if any of the tables invloved in this query requires
* update lock
*/
private boolean isUpdateLockRequired() {
boolean updateLockRequired = false;
// TODO: We can optimize this by storing the value in a member variable
for (int i = 0; i < tableList.size() && !updateLockRequired; i++) {
QueryTable queryTable = (QueryTable) tableList.get(i);
updateLockRequired = isUpdateLockRequired(queryTable);
}
return updateLockRequired;
}
/**
* Processes Order By constraints and calls the super class
* method for all other constrains.
*/
protected void processRootConstraint(ConstraintOperation opNode,
List stack,
StringBuffer whereText) {
int op = opNode.operation;
int opInfo = operationFormat(op);
if ((opInfo & OP_ORDERBY_MASK) > 0) {
stack.remove(stack.size() - 1);
ConstraintNode node = (ConstraintNode) stack.get(stack.size() - 1);
if (!(node instanceof ConstraintField)) {
throw new JDOFatalInternalException(I18NHelper.getMessage(messages,
"core.constraint.needfieldnode")); // NOI18N
} else {
processOrderByField((ConstraintFieldDesc) node, op);
stack.remove(stack.size() - 1);
}
} else {
super.processRootConstraint(opNode, stack, whereText);
}
}
protected void processIrregularOperation(ConstraintOperation opNode,
int opCode,
List stack,
StringBuffer result) {
switch (opCode) {
case ActionDesc.OP_EQUIJOIN:
processJoinOperation((ConstraintJoin)opNode, result);
break;
default:
super.processIrregularOperation(opNode, opCode, stack, result);
}
}
/**
* Process outer join constraints for this statement.
*
* @return A string buffer representing outer join conditions for this
* statement. Please note that the returned string buffer will have text
* only for Oracle
*/
private StringBuffer processOuterJoinConstraints() {
StringBuffer joinCondition = null;
final List joinStack = constraint.getOuterJoinConstraints();
final int joinStackSize = joinStack.size();
if (joinStackSize > 0) {
joinCondition = new StringBuffer();
for (int i = 0; i < joinStackSize; i++) {
ConstraintJoin joinNode = (ConstraintJoin) joinStack.get(i);
processJoinOperation(joinNode, joinCondition);
}
}
return joinCondition;
}
/**
* Generates a join condition for specified jnode. Equi joins and native
* outer joins end up in the where clause. Ansi compliant outer join
* conditions end up in the from clause.
*
* @param jnode Join constraint.
* @param whereText String buffer taking the join condition. Generated
* join condition is appended to this string buffer.
*/
private void processJoinOperation(ConstraintJoin jnode,
StringBuffer whereText) {
int opCode = jnode.operation;
// Generate ANSI outer joins if doAnsiJoin == true,
// i.e. the vendor has no "native" outer join semantics.
boolean doAnsiJoin = opCode != ActionDesc.OP_EQUIJOIN
&& !vendorType.isNativeOuterJoin();
if (doAnsiJoin) {
generateAnsiJoin(jnode, opCode);
} else {
generateJoin(jnode, whereText, opCode);
}
}
/**
* Generate a "regular" join. The columns for the join condition
* end up in the where clause. The corresponding tables are added
* directly to the member variable tableList.
* Note that this method is normally called to process EQUI- joins
* only. For databases that are marked for native join sematics,
* this method will be called to process both EQUI- and OUTER- joins.
*
* @param jnode Join constraint.
* @param whereText String buffer taking the join condition. Generated
* join condition is appended to this string buffer.
* @param opCode Join operation.
*/
private void generateJoin(ConstraintJoin jnode,
StringBuffer whereText,
int opCode) {
for (int i = 0; i < jnode.fromColumns.size(); i++) {
ColumnElement fromColumn = (ColumnElement)jnode.fromColumns.get(i);
ColumnElement toColumn = (ColumnElement)jnode.toColumns.get(i);
QueryTable fromTable = findQueryTable(jnode.fromPlan, fromColumn);
QueryTable toTable = findQueryTable(jnode.toPlan, toColumn);
addQueryTable(fromTable);
addQueryTable(toTable);
toTable.prevTable = null;
appendJoinCondition(whereText,
fromTable, toTable, fromColumn, toColumn,
getJoinOperator(opCode));
if (opCode == ActionDesc.OP_LEFTJOIN ) {
// Append oracle style (+) or similar.
whereText.append(vendorType.getLeftJoinPost());
}
}
}
/**
* Generates an ANSI compliant join. The columns for the join
* condition end up in the from clause. The joined tables
* are added indirectly to the member variable tableList by
* being added to {@link QueryTable#nextTable} associated with
* the "from-" table.
*
* @param jnode Join constraint.
* @param opCode Join operation.
* @see #processFromClause
*/
private void generateAnsiJoin(ConstraintJoin jnode, int opCode) {
for (int i = 0; i < jnode.fromColumns.size(); i++) {
ColumnElement fromColumn = (ColumnElement)jnode.fromColumns.get(i);
ColumnElement toColumn = (ColumnElement)jnode.toColumns.get(i);
QueryTable fromTable = findQueryTable(jnode.fromPlan, fromColumn);
QueryTable toTable = findQueryTable(jnode.toPlan, toColumn);
// Process the from clause
processFromClause(fromTable, toTable);
// Process the on clause.
if (toTable.onClause == null) {
toTable.onClause = new StringBuffer();
}
appendJoinCondition(toTable.onClause, fromTable, toTable, fromColumn, toColumn, "="); //NOI18N
fromTable.joinOp = opCode;
}
}
/**
* Processes specified fromTable and toTable to generate appropriate from
* clause when table text is generated.
* toTable is added to fromTable.nextTable if not already present. See
* {@link #appendAnsiJoinTableText(StringBuffer,QueryTable)} for
* details on how this is used to generate table text.
*
* @param fromTable The from table
* @param toTable The to table.
*/
private static void processFromClause(QueryTable fromTable, QueryTable toTable) {
if (toTable.prevTable != null && toTable.prevTable != fromTable) {
// TODO
}
// TODO:
// Check that these tables aren't already participating in
// a join (except to each other). If either of them are
// then we will have to make a new table alias for that
// table and put in an addtional equijoin between the old
// alias and the new based, of course, on the key columns.
if (fromTable.nextTable == null) {
fromTable.nextTable = new ArrayList();
fromTable.nextTable.add(toTable);
toTable.prevTable = fromTable;
} else {
// Make sure we don't add the same table twice.
if (!fromTable.nextTable.contains(toTable)) {
fromTable.nextTable.add(toTable);
toTable.prevTable = fromTable;
}
}
}
/**
* Appends join condition corresponding to specified fromTable, toTable,
* fromColumn, toColumn, joinOp to result. If result is not empty " and "
* will be appended to it before appending the join condition.
*
* @param result The string buffer to which the condition will be appended.
* @param fromTable The from table.
* @param toTable The to table.
* @param fromColumn The from column.
* @param toColumn The to column.
* @param joinOp Join operation.
*/
private void appendJoinCondition(StringBuffer result,
QueryTable fromTable, QueryTable toTable,
ColumnElement fromColumn, ColumnElement toColumn,
String joinOp) {
if (result.length() > 0) {
// Composite fk.
result.append(" and ");
}
result.append("t").append(fromTable.getTableIndex()).append("."); // NOI18N
appendQuotedText(result, fromColumn.getName().getName());
result.append(" ").append(joinOp). // NOI18N
append(" t").append(toTable.getTableIndex()).append("."); // NOI18N
appendQuotedText(result, toColumn.getName().getName());
}
/**
* Returns join operator for specified operation.
*
* @param operation The join operation. Should be one of
* ActionDesc.OP_EQUIJOIN, ActionDesc.OP_LEFTJOIN or ActionDesc.OP_RIGHTJOIN.
* @return join operator for specified operation.
*/
protected String getJoinOperator(int operation) {
String result = null;
switch (operation) {
case ActionDesc.OP_EQUIJOIN:
result = " = "; // NOI18N
break;
case ActionDesc.OP_LEFTJOIN:
result = vendorType.getLeftJoin();
break;
case ActionDesc.OP_RIGHTJOIN:
result = vendorType.getRightJoin();
break;
default:
throw new JDOFatalInternalException(
I18NHelper.getMessage(messages,
"core.constraint.illegalop", operation)); // NOI18N
}
return result;
}
private static QueryTable findQueryTable(QueryPlan plan, ColumnElement ce) {
QueryTable table = plan.findQueryTable(ce.getDeclaringTable());
if (table == null) {
// TODO: throw exception
}
return table;
}
private String generateTableListText() {
StringBuffer str = new StringBuffer();
for (int i = 0; i < tableList.size(); i++) {
QueryTable t = (QueryTable) tableList.get(i);
if (t.prevTable == null && t.nextTable == null) {
appendTableText(str, t);
str.append(", "); // NOI18N
} else {
// Table is part of an outer join list.
if (t.prevTable == null) {
// Beginning of the list.
appendAnsiJoinText(str, t);
} else {
// The table is in the "middle" of the list.
while (t.prevTable != null) {
t = t.prevTable;
}
if (!tableList.contains(t)) {
// Outer join list starts with a join table.
// Because join tables aren't in the table list,
// they wouldn't be included in the table text.
appendAnsiJoinText(str, t);
}
}
}
}
str.delete(str.length() - 2, str.length());
return str.toString();
}
private void appendAnsiJoinText(StringBuffer str, QueryTable t) {
// TODO: getTableListStart() and getTableListEnd() returns ""
// for all the databases. Do we need it ?
str.append(vendorType.getTableListStart());
appendAnsiJoinTableText(str, t);
str.append(vendorType.getTableListEnd());
str.append(", "); // NOI18N
}
/**
* Appends sql text corresponding to specified <code>table to specified text.
* The linked list starting with table.nextTable is walked recursively
* to generate join text.
*
* @param text The string buffer receiving sql text.
* @param table Table to be joined.
*/
private void appendAnsiJoinTableText(StringBuffer text, QueryTable table) {
if (table.joinOp == ActionDesc.OP_RIGHTJOIN) {
text.append(vendorType.getRightJoinPre());
}
if (table.prevTable == null) {
appendTableText(text, table);
}
for (int i = 0; i < table.nextTable.size(); i++) {
QueryTable toTable = (QueryTable) table.nextTable.get(i);
text.append(getJoinOperator(table.joinOp)).append(" "); // NOI18N
appendTableText(text, toTable);
if (toTable.onClause != null) {
text.append(" on "); // NOI18N
text.append(toTable.onClause);
}
if (toTable.nextTable != null) {
appendAnsiJoinTableText(text, toTable);
}
// Note: Since this method is called only for ANSI joins,
// and only oracle has getLeftJoinPost() defined, we will never
// append any text through following code.
if (table.joinOp == ActionDesc.OP_LEFTJOIN) {
text.append(vendorType.getLeftJoinPost());
}
}
}
/**
* Adds a column corresponding to field <code>fieldNode and
* order operation <code>op to the order constraint.
*
* @param fieldNode Constraint on a field name of a persistence capable class.
* @param op Order operation.
*/
private void processOrderByField(ConstraintFieldDesc fieldNode, int op) {
QueryPlan thePlan = getOriginalPlan(fieldNode);
StringBuffer orderText = new StringBuffer();
generateColumnText(fieldNode.desc, thePlan, orderText);
if (op == ActionDesc.OP_ORDERBY_DESC) {
orderText.append(" desc"); // NOI18N
}
if (orderClause.length() > 0) {
orderText.append(", "); // NOI18N
orderText.append(orderClause);
}
orderClause = orderText;
}
/**
* Binds input valus corrsponding to this <code>Statement object to
* database statement s.
* @param s The database statement.
* @param parameters If an InputValue to be bound is a parameter, the actual
* value is contained in this.
* @throws SQLException
*/
public void bindInputValues(DBStatement s, ValueFetcher parameters)
throws SQLException {
for (int i = 0, size = inputDesc.values.size(); i < size; i++) {
InputValue inputVal = (InputValue) inputDesc.values.get(i);
s.bindInputColumn(i + 1, getInputValue(inputVal, parameters),
inputVal.getColumnElement(), vendorType);
}
}
/**
* Get Input values to be bound to this statement.
* @param parameters If an InputValue to be bound is a parameter, the actual
* value is contained in this.
* @return An Object array containing input values to be bound to this statement.
*/
private Object[] getInputValues(ValueFetcher parameters) {
final int size = inputDesc.values.size();
Object[] inputValues = new Object[size];
for (int i = 0; i < size; i++) {
InputValue inputValue = (InputValue) inputDesc.values.get(i);
inputValues[i] = getInputValue(inputValue, parameters);
}
return inputValues;
}
/**
* Gets formatted sql text corrsponding to this statement object. The text
* also contains values for input to the statement.
* @param parameters The input paramters to this statement.
* @return formatted sql text corrsponding to this statement object.
*/
public String getFormattedSQLText(ValueFetcher parameters) {
return formatSqlText(getText(), getInputValues(parameters)) ;
}
/**
* Gets actual value corresponding to <code>inputVal. If
* <code>inputVal is an instanceof InputValue then value contained
* in inputVal is returned. If <code>inputVal is an instanceof
* InputParamValue then value returned is obtained from <code>parameters
* </code>.
* @param inputVal The input value.
* @param parameters The parameters.
* @return Appropriate value as described above.
*/
private static Object getInputValue(InputValue inputVal,
ValueFetcher parameters) {
Object val;
if (inputVal instanceof InputParamValue) {
int paramIndex = ((InputParamValue) inputVal).getParamIndex().intValue();
val = parameters.getValue(paramIndex);
}
else {
val = inputVal.getValue();
}
return val;
}
}
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