/
Merge.java
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/
Merge.java
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/*
* Copyright 2004-2013 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.lealone.sql.dml;
import java.util.ArrayList;
import org.lealone.common.exceptions.DbException;
import org.lealone.common.util.New;
import org.lealone.common.util.StatementBuilder;
import org.lealone.db.ServerSession;
import org.lealone.db.api.ErrorCode;
import org.lealone.db.api.Trigger;
import org.lealone.db.auth.Right;
import org.lealone.db.index.Index;
import org.lealone.db.result.Result;
import org.lealone.db.result.Row;
import org.lealone.db.table.Column;
import org.lealone.db.table.Table;
import org.lealone.db.value.Value;
import org.lealone.db.value.ValueNull;
import org.lealone.sql.PreparedStatement;
import org.lealone.sql.SQLStatement;
import org.lealone.sql.StatementBase;
import org.lealone.sql.expression.Expression;
import org.lealone.sql.expression.Parameter;
/**
* This class represents the statement
* MERGE
*/
public class Merge extends ManipulateStatement {
private Table table;
private Column[] columns;
private Column[] keys;
private final ArrayList<Expression[]> list = New.arrayList();
private Query query;
private StatementBase update;
public Merge(ServerSession session) {
super(session);
}
@Override
public int getType() {
return SQLStatement.MERGE;
}
@Override
public boolean isCacheable() {
return true;
}
@Override
public void setLocal(boolean local) {
super.setLocal(local);
if (query != null)
query.setLocal(local);
}
public void setTable(Table table) {
this.table = table;
}
public void setColumns(Column[] columns) {
this.columns = columns;
}
public void setKeys(Column[] keys) {
this.keys = keys;
}
public void setQuery(Query query) {
this.query = query;
}
public void addRow(Expression[] expr) {
list.add(expr);
}
@Override
public PreparedStatement prepare() {
if (columns == null) {
if (list.size() > 0 && list.get(0).length == 0) {
// special case where table is used as a sequence
columns = new Column[0];
} else {
columns = table.getColumns();
}
}
if (list.size() > 0) {
for (Expression[] expr : list) {
if (expr.length != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
for (int i = 0; i < expr.length; i++) {
Expression e = expr[i];
if (e != null) {
expr[i] = e.optimize(session);
}
}
}
} else {
query.prepare();
if (query.getColumnCount() != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
}
if (keys == null) {
Index idx = table.getPrimaryKey();
if (idx == null) {
throw DbException.get(ErrorCode.CONSTRAINT_NOT_FOUND_1, "PRIMARY KEY");
}
keys = idx.getColumns();
}
StatementBuilder buff = new StatementBuilder("UPDATE ");
buff.append(table.getSQL()).append(" SET ");
for (Column c : columns) {
buff.appendExceptFirst(", ");
buff.append(c.getSQL()).append("=?");
}
buff.append(" WHERE ");
buff.resetCount();
for (Column c : keys) {
buff.appendExceptFirst(" AND ");
buff.append(c.getSQL()).append("=?");
}
String sql = buff.toString();
update = (StatementBase) session.prepareStatement(sql);
return this;
}
@Override
public int update() {
int count;
session.getUser().checkRight(table, Right.INSERT);
session.getUser().checkRight(table, Right.UPDATE);
setCurrentRowNumber(0);
if (list.size() > 0) {
count = 0;
for (int x = 0, size = list.size(); x < size; x++) {
setCurrentRowNumber(x + 1);
Expression[] expr = list.get(x);
Row newRow = table.getTemplateRow();
for (int i = 0, len = columns.length; i < len; i++) {
Column c = columns[i];
int index = c.getColumnId();
Expression e = expr[i];
if (e != null) {
// e can be null (DEFAULT)
try {
Value v = c.convert(e.getValue(session));
newRow.setValue(index, v);
} catch (DbException ex) {
throw setRow(ex, count, getSQL(expr));
}
}
}
merge(newRow);
count++;
}
} else {
Result rows = query.query(0);
count = 0;
table.fire(session, Trigger.UPDATE | Trigger.INSERT, true);
table.lock(session, true, false);
while (rows.next()) {
count++;
Value[] r = rows.currentRow();
Row newRow = table.getTemplateRow();
setCurrentRowNumber(count);
for (int j = 0; j < columns.length; j++) {
Column c = columns[j];
int index = c.getColumnId();
try {
Value v = c.convert(r[j]);
newRow.setValue(index, v);
} catch (DbException ex) {
throw setRow(ex, count, getSQL(r));
}
}
merge(newRow);
}
rows.close();
table.fire(session, Trigger.UPDATE | Trigger.INSERT, false);
}
return count;
}
private void merge(Row row) {
ArrayList<Parameter> k = update.getParameters();
for (int i = 0; i < columns.length; i++) {
Column col = columns[i];
Value v = row.getValue(col.getColumnId());
if (v == null)
v = ValueNull.INSTANCE;
Parameter p = k.get(i);
p.setValue(v);
}
for (int i = 0; i < keys.length; i++) {
Column col = keys[i];
Value v = row.getValue(col.getColumnId());
if (v == null) {
throw DbException.get(ErrorCode.COLUMN_CONTAINS_NULL_VALUES_1, col.getSQL());
}
Parameter p = k.get(columns.length + i);
p.setValue(v);
}
// 先更新,如果没有记录被更新,说明是一条新的记录,接着再插入
int count = update.update();
if (count == 0) {
try {
table.validateConvertUpdateSequence(session, row);
boolean done = table.fireBeforeRow(session, null, row);
if (!done) {
table.lock(session, true, false);
table.addRow(session, row);
table.fireAfterRow(session, null, row, false);
}
} catch (DbException e) {
if (e.getErrorCode() == ErrorCode.DUPLICATE_KEY_1) {
// possibly a concurrent merge or insert
Index index = (Index) e.getSource();
if (index != null) {
// verify the index columns match the key
Column[] indexColumns = index.getColumns();
boolean indexMatchesKeys = false;
if (indexColumns.length <= keys.length) {
for (int i = 0; i < indexColumns.length; i++) {
if (indexColumns[i] != keys[i]) {
indexMatchesKeys = false;
break;
}
}
}
if (indexMatchesKeys) {
throw DbException.get(ErrorCode.CONCURRENT_UPDATE_1, table.getName());
}
}
}
throw e;
}
} else if (count != 1) {
throw DbException.get(ErrorCode.DUPLICATE_KEY_1, table.getSQL());
}
}
@Override
public String getPlanSQL() {
StatementBuilder buff = new StatementBuilder("MERGE INTO ");
buff.append(table.getSQL()).append('(');
for (Column c : columns) {
buff.appendExceptFirst(", ");
buff.append(c.getSQL());
}
buff.append(')');
if (keys != null) {
buff.append(" KEY(");
buff.resetCount();
for (Column c : keys) {
buff.appendExceptFirst(", ");
buff.append(c.getSQL());
}
buff.append(')');
}
buff.append('\n');
if (list.size() > 0) {
buff.append(" VALUES ");
int row = 0;
for (Expression[] expr : list) {
if (row++ > 0) {
buff.append(", ");
}
buff.append('(');
buff.resetCount();
for (Expression e : expr) {
buff.appendExceptFirst(", ");
if (e == null) {
buff.append("DEFAULT");
} else {
buff.append(e.getSQL());
}
}
buff.append(')');
}
} else {
buff.append(query.getPlanSQL());
}
return buff.toString();
}
@Override
public double getCost() {
return query != null ? query.getCost() : list.size();
}
@Override
public int getPriority() {
if (getCurrentRowNumber() > 0)
return priority;
priority = NORM_PRIORITY - 1;
return priority;
}
}