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org.h2.command.dml.Insert Maven / Gradle / Ivy
/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.command.dml;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
import org.h2.api.ErrorCode;
import org.h2.api.Trigger;
import org.h2.command.Command;
import org.h2.command.CommandInterface;
import org.h2.engine.DbObject;
import org.h2.engine.Right;
import org.h2.engine.Session;
import org.h2.engine.UndoLogRecord;
import org.h2.expression.Expression;
import org.h2.expression.ExpressionColumn;
import org.h2.expression.ExpressionVisitor;
import org.h2.expression.Parameter;
import org.h2.expression.ValueExpression;
import org.h2.expression.condition.Comparison;
import org.h2.expression.condition.ConditionAndOr;
import org.h2.index.Index;
import org.h2.message.DbException;
import org.h2.mvstore.db.MVPrimaryIndex;
import org.h2.pagestore.db.PageDataIndex;
import org.h2.result.ResultInterface;
import org.h2.result.ResultTarget;
import org.h2.result.Row;
import org.h2.table.Column;
import org.h2.table.DataChangeDeltaTable.ResultOption;
import org.h2.table.Table;
import org.h2.table.TableFilter;
import org.h2.value.Value;
import org.h2.value.ValueNull;
/**
* This class represents the statement
* INSERT
*/
public class Insert extends CommandWithValues implements ResultTarget, DataChangeStatement {
private Table table;
private Column[] columns;
private Query query;
private boolean sortedInsertMode;
private int rowNumber;
private boolean insertFromSelect;
/**
* This table filter is for MERGE..USING support - not used in stand-alone DML
*/
private TableFilter sourceTableFilter;
/**
* For MySQL-style INSERT ... ON DUPLICATE KEY UPDATE ....
*/
private HashMap duplicateKeyAssignmentMap;
/**
* For MySQL-style INSERT IGNORE and PostgreSQL-style ON CONFLICT DO
* NOTHING.
*/
private boolean ignore;
private ResultTarget deltaChangeCollector;
private ResultOption deltaChangeCollectionMode;
public Insert(Session session) {
super(session);
}
@Override
public void setCommand(Command command) {
super.setCommand(command);
if (query != null) {
query.setCommand(command);
}
}
@Override
public Table getTable() {
return table;
}
public void setTable(Table table) {
this.table = table;
}
public void setColumns(Column[] columns) {
this.columns = columns;
}
/**
* Sets MySQL-style INSERT IGNORE mode or PostgreSQL-style ON CONFLICT
* DO NOTHING.
*
* @param ignore ignore duplicates
*/
public void setIgnore(boolean ignore) {
this.ignore = ignore;
}
public void setQuery(Query query) {
this.query = query;
}
/**
* Keep a collection of the columns to pass to update if a duplicate key
* happens, for MySQL-style INSERT ... ON DUPLICATE KEY UPDATE ....
*
* @param column the column
* @param expression the expression
*/
public void addAssignmentForDuplicate(Column column, Expression expression) {
if (duplicateKeyAssignmentMap == null) {
duplicateKeyAssignmentMap = new HashMap<>();
}
if (duplicateKeyAssignmentMap.put(column, expression) != null) {
throw DbException.get(ErrorCode.DUPLICATE_COLUMN_NAME_1, column.getName());
}
}
@Override
public void setDeltaChangeCollector(ResultTarget deltaChangeCollector, ResultOption deltaChangeCollectionMode) {
this.deltaChangeCollector = deltaChangeCollector;
this.deltaChangeCollectionMode = deltaChangeCollectionMode;
}
@Override
public int update() {
Index index = null;
if (sortedInsertMode) {
if (!session.getDatabase().isMVStore()) {
/*
* Take exclusive lock, otherwise two different inserts running at
* the same time, the second might accidentally get
* sorted-insert-mode.
*/
table.lock(session, /* exclusive */true, /* forceLockEvenInMvcc */true);
}
index = table.getScanIndex(session);
index.setSortedInsertMode(true);
}
try {
return insertRows();
} finally {
if (index != null) {
index.setSortedInsertMode(false);
}
}
}
private int insertRows() {
session.getUser().checkRight(table, Right.INSERT);
setCurrentRowNumber(0);
table.fire(session, Trigger.INSERT, true);
rowNumber = 0;
int listSize = valuesExpressionList.size();
if (listSize > 0) {
int columnLen = columns.length;
for (int x = 0; x < listSize; x++) {
Row newRow = table.getTemplateRow();
Expression[] expr = valuesExpressionList.get(x);
setCurrentRowNumber(x + 1);
for (int i = 0; i < columnLen; i++) {
Column c = columns[i];
int index = c.getColumnId();
Expression e = expr[i];
if (e != null) {
// e can be null (DEFAULT)
e = e.optimize(session);
try {
Value v = e.getValue(session);
newRow.setValue(index, v);
} catch (DbException ex) {
throw setRow(ex, x, getSimpleSQL(expr));
}
}
}
rowNumber++;
table.validateConvertUpdateSequence(session, newRow);
if (deltaChangeCollectionMode == ResultOption.NEW) {
deltaChangeCollector.addRow(newRow.getValueList().clone());
}
boolean done = table.fireBeforeRow(session, null, newRow);
if (!done) {
table.lock(session, true, false);
try {
table.addRow(session, newRow);
} catch (DbException de) {
if (handleOnDuplicate(de, null)) {
// MySQL returns 2 for updated row
// TODO: detect no-op change
rowNumber++;
} else {
// INSERT IGNORE case
rowNumber--;
}
continue;
}
if (deltaChangeCollectionMode == ResultOption.FINAL) {
deltaChangeCollector.addRow(newRow.getValueList());
}
session.log(table, UndoLogRecord.INSERT, newRow);
table.fireAfterRow(session, null, newRow, false);
}
}
} else {
table.lock(session, true, false);
if (insertFromSelect) {
query.query(0, this);
} else {
ResultInterface rows = query.query(0);
while (rows.next()) {
Value[] r = rows.currentRow();
try {
addRow(r);
} catch (DbException de) {
if (handleOnDuplicate(de, r)) {
// MySQL returns 2 for updated row
// TODO: detect no-op change
rowNumber++;
} else {
// INSERT IGNORE case
rowNumber--;
}
}
}
rows.close();
}
}
table.fire(session, Trigger.INSERT, false);
return rowNumber;
}
@Override
public void addRow(Value... values) {
Row newRow = table.getTemplateRow();
setCurrentRowNumber(++rowNumber);
for (int j = 0, len = columns.length; j < len; j++) {
newRow.setValue(columns[j].getColumnId(), values[j]);
}
table.validateConvertUpdateSequence(session, newRow);
if (deltaChangeCollectionMode == ResultOption.NEW) {
deltaChangeCollector.addRow(newRow.getValueList().clone());
}
boolean done = table.fireBeforeRow(session, null, newRow);
if (!done) {
table.addRow(session, newRow);
if (deltaChangeCollectionMode == ResultOption.FINAL) {
deltaChangeCollector.addRow(newRow.getValueList());
}
session.log(table, UndoLogRecord.INSERT, newRow);
table.fireAfterRow(session, null, newRow, false);
}
}
@Override
public int getRowCount() {
return rowNumber;
}
@Override
public void limitsWereApplied() {
// Nothing to do
}
@Override
public String getPlanSQL(boolean alwaysQuote) {
StringBuilder builder = new StringBuilder("INSERT INTO ");
table.getSQL(builder, alwaysQuote).append('(');
Column.writeColumns(builder, columns, alwaysQuote);
builder.append(")\n");
if (insertFromSelect) {
builder.append("DIRECT ");
}
if (sortedInsertMode) {
builder.append("SORTED ");
}
if (!valuesExpressionList.isEmpty()) {
builder.append("VALUES ");
int row = 0;
if (valuesExpressionList.size() > 1) {
builder.append('\n');
}
for (Expression[] expr : valuesExpressionList) {
if (row++ > 0) {
builder.append(",\n");
}
builder.append('(');
Expression.writeExpressions(builder, expr, alwaysQuote);
builder.append(')');
}
} else {
builder.append(query.getPlanSQL(alwaysQuote));
}
return builder.toString();
}
@Override
public void prepare() {
if (columns == null) {
if (!valuesExpressionList.isEmpty() && valuesExpressionList.get(0).length == 0) {
// special case where table is used as a sequence
columns = new Column[0];
} else {
columns = table.getColumns();
}
}
if (!valuesExpressionList.isEmpty()) {
for (Expression[] expr : valuesExpressionList) {
if (expr.length != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
for (int i = 0, len = expr.length; i < len; i++) {
Expression e = expr[i];
if (e != null) {
if(sourceTableFilter!=null){
e.mapColumns(sourceTableFilter, 0, Expression.MAP_INITIAL);
}
e = e.optimize(session);
if (e instanceof Parameter) {
Parameter p = (Parameter) e;
p.setColumn(columns[i]);
}
expr[i] = e;
}
}
}
} else {
query.prepare();
if (query.getColumnCount() != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
}
}
@Override
public boolean isTransactional() {
return true;
}
@Override
public ResultInterface queryMeta() {
return null;
}
public void setSortedInsertMode(boolean sortedInsertMode) {
this.sortedInsertMode = sortedInsertMode;
}
@Override
public int getType() {
return CommandInterface.INSERT;
}
@Override
public String getStatementName() {
return "INSERT";
}
public void setInsertFromSelect(boolean value) {
this.insertFromSelect = value;
}
@Override
public boolean isCacheable() {
return duplicateKeyAssignmentMap == null;
}
/**
* @param de duplicate key exception
* @param currentRow current row values (optional)
* @return {@code true} if row was updated, {@code false} if row was ignored
*/
private boolean handleOnDuplicate(DbException de, Value[] currentRow) {
if (de.getErrorCode() != ErrorCode.DUPLICATE_KEY_1) {
throw de;
}
if (duplicateKeyAssignmentMap == null) {
if (ignore) {
return false;
}
throw de;
}
int columnCount = columns.length;
ArrayList variableNames = new ArrayList<>(columnCount);
Expression[] row = (currentRow == null) ? valuesExpressionList.get((int) getCurrentRowNumber() - 1)
: new Expression[columnCount];
for (int i = 0; i < columnCount; i++) {
StringBuilder builder = table.getSQL(new StringBuilder(), true).append('.');
String key = columns[i].getSQL(builder, true).toString();
variableNames.add(key);
Value value;
if (currentRow != null) {
value = currentRow[i];
row[i] = ValueExpression.get(value);
} else {
value = row[i].getValue(session);
}
session.setVariable(key, value);
}
StringBuilder builder = new StringBuilder("UPDATE ");
table.getSQL(builder, true).append(" SET ");
boolean f = false;
for (Entry entry : duplicateKeyAssignmentMap.entrySet()) {
if (f) {
builder.append(", ");
}
f = true;
entry.getKey().getSQL(builder, true).append('=');
entry.getValue().getSQL(builder, true);
}
builder.append(" WHERE ");
Index foundIndex = (Index) de.getSource();
if (foundIndex == null) {
throw DbException.getUnsupportedException(
"Unable to apply ON DUPLICATE KEY UPDATE, no index found!");
}
prepareUpdateCondition(foundIndex, row).getSQL(builder, true);
String sql = builder.toString();
Update command = (Update) session.prepare(sql);
command.setUpdateToCurrentValuesReturnsZero(true);
for (Parameter param : command.getParameters()) {
Parameter insertParam = parameters.get(param.getIndex());
param.setValue(insertParam.getValue(session));
}
boolean result = command.update() > 0;
for (String variableName : variableNames) {
session.setVariable(variableName, ValueNull.INSTANCE);
}
return result;
}
private Expression prepareUpdateCondition(Index foundIndex, Expression[] row) {
// MVPrimaryIndex is playing fast and loose with it's implementation of
// the Index interface.
// It returns all of the columns in the table when we call
// getIndexColumns() or getColumns().
// Don't have time right now to fix that, so just special-case it.
// PageDataIndex has the same problem.
final Column[] indexedColumns;
if (foundIndex instanceof MVPrimaryIndex) {
MVPrimaryIndex foundMV = (MVPrimaryIndex) foundIndex;
indexedColumns = new Column[] { foundMV.getIndexColumns()[foundMV
.getMainIndexColumn()].column };
} else if (foundIndex instanceof PageDataIndex) {
PageDataIndex foundPD = (PageDataIndex) foundIndex;
int mainIndexColumn = foundPD.getMainIndexColumn();
indexedColumns = mainIndexColumn >= 0
? new Column[] { foundPD.getIndexColumns()[mainIndexColumn].column }
: foundIndex.getColumns();
} else {
indexedColumns = foundIndex.getColumns();
}
Expression condition = null;
for (Column column : indexedColumns) {
ExpressionColumn expr = new ExpressionColumn(session.getDatabase(),
table.getSchema().getName(), table.getName(),
column.getName(), false);
for (int i = 0; i < columns.length; i++) {
if (expr.getColumnName().equals(columns[i].getName())) {
if (condition == null) {
condition = new Comparison(session, Comparison.EQUAL, expr, row[i]);
} else {
condition = new ConditionAndOr(ConditionAndOr.AND, condition,
new Comparison(session, Comparison.EQUAL, expr, row[i]));
}
break;
}
}
}
return condition;
}
public void setSourceTableFilter(TableFilter sourceTableFilter) {
this.sourceTableFilter = sourceTableFilter;
}
@Override
public void collectDependencies(HashSet dependencies) {
ExpressionVisitor visitor = ExpressionVisitor.getDependenciesVisitor(dependencies);
if (query != null) {
query.isEverything(visitor);
}
if (sourceTableFilter != null) {
Select select = sourceTableFilter.getSelect();
if (select != null) {
select.isEverything(visitor);
}
}
}
}
