/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.plugin.jdbc;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.predicate.Domain;
import com.facebook.presto.spi.predicate.Range;
import com.facebook.presto.spi.predicate.TupleDomain;
import com.facebook.presto.spi.type.BigintType;
import com.facebook.presto.spi.type.BooleanType;
import com.facebook.presto.spi.type.DateType;
import com.facebook.presto.spi.type.DoubleType;
import com.facebook.presto.spi.type.IntegerType;
import com.facebook.presto.spi.type.RealType;
import com.facebook.presto.spi.type.SmallintType;
import com.facebook.presto.spi.type.TimeType;
import com.facebook.presto.spi.type.TimeWithTimeZoneType;
import com.facebook.presto.spi.type.TimestampType;
import com.facebook.presto.spi.type.TimestampWithTimeZoneType;
import com.facebook.presto.spi.type.TinyintType;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.VarcharType;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import org.joda.time.DateTimeZone;
import java.sql.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;
import static com.facebook.presto.spi.type.DateTimeEncoding.unpackMillisUtc;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Strings.isNullOrEmpty;
import static com.google.common.collect.Iterables.getOnlyElement;
import static java.lang.Float.intBitsToFloat;
import static java.util.Collections.nCopies;
import static java.util.Objects.requireNonNull;
import static java.util.concurrent.TimeUnit.DAYS;
import static java.util.stream.Collectors.joining;
import static org.joda.time.DateTimeZone.UTC;
public class QueryBuilder
{
private final String quote;
private static class TypeAndValue
{
private final Type type;
private final Object value;
public TypeAndValue(Type type, Object value)
{
this.type = requireNonNull(type, "type is null");
this.value = requireNonNull(value, "value is null");
}
public Type getType()
{
return type;
}
public Object getValue()
{
return value;
}
}
public QueryBuilder(String quote)
{
this.quote = requireNonNull(quote, "quote is null");
}
public PreparedStatement buildSql(JdbcClient client, Connection connection, String catalog, String schema, String table, List<JdbcColumnHandle> columns, TupleDomain<ColumnHandle> tupleDomain)
throws SQLException
{
StringBuilder sql = new StringBuilder();
String columnNames = columns.stream()
.map(JdbcColumnHandle::getColumnName)
.map(this::quote)
.collect(joining(", "));
sql.append("SELECT ");
sql.append(columnNames);
if (columns.isEmpty()) {
sql.append("null");
}
sql.append(" FROM ");
if (!isNullOrEmpty(catalog)) {
sql.append(quote(catalog)).append('.');
}
if (!isNullOrEmpty(schema)) {
sql.append(quote(schema)).append('.');
}
sql.append(quote(table));
List<TypeAndValue> accumulator = new ArrayList<>();
List<String> clauses = toConjuncts(columns, tupleDomain, accumulator);
if (!clauses.isEmpty()) {
sql.append(" WHERE ")
.append(Joiner.on(" AND ").join(clauses));
}
PreparedStatement statement = client.getPreparedStatement(connection, sql.toString());
for (int i = 0; i < accumulator.size(); i++) {
TypeAndValue typeAndValue = accumulator.get(i);
if (typeAndValue.getType().equals(BigintType.BIGINT)) {
statement.setLong(i + 1, (long) typeAndValue.getValue());
}
else if (typeAndValue.getType().equals(IntegerType.INTEGER)) {
statement.setInt(i + 1, ((Number) typeAndValue.getValue()).intValue());
}
else if (typeAndValue.getType().equals(SmallintType.SMALLINT)) {
statement.setShort(i + 1, ((Number) typeAndValue.getValue()).shortValue());
}
else if (typeAndValue.getType().equals(TinyintType.TINYINT)) {
statement.setByte(i + 1, ((Number) typeAndValue.getValue()).byteValue());
}
else if (typeAndValue.getType().equals(DoubleType.DOUBLE)) {
statement.setDouble(i + 1, (double) typeAndValue.getValue());
}
else if (typeAndValue.getType().equals(RealType.REAL)) {
statement.setFloat(i + 1, intBitsToFloat(((Number) typeAndValue.getValue()).intValue()));
}
else if (typeAndValue.getType().equals(BooleanType.BOOLEAN)) {
statement.setBoolean(i + 1, (boolean) typeAndValue.getValue());
}
else if (typeAndValue.getType().equals(DateType.DATE)) {
long millis = DAYS.toMillis((long) typeAndValue.getValue());
statement.setDate(i + 1, new Date(UTC.getMillisKeepLocal(DateTimeZone.getDefault(), millis)));
}
else if (typeAndValue.getType().equals(TimeType.TIME)) {
statement.setTime(i + 1, new Time((long) typeAndValue.getValue()));
}
else if (typeAndValue.getType().equals(TimeWithTimeZoneType.TIME_WITH_TIME_ZONE)) {
statement.setTime(i + 1, new Time(unpackMillisUtc((long) typeAndValue.getValue())));
}
else if (typeAndValue.getType().equals(TimestampType.TIMESTAMP)) {
statement.setTimestamp(i + 1, new Timestamp((long) typeAndValue.getValue()));
}
else if (typeAndValue.getType().equals(TimestampWithTimeZoneType.TIMESTAMP_WITH_TIME_ZONE)) {
statement.setTimestamp(i + 1, new Timestamp(unpackMillisUtc((long) typeAndValue.getValue())));
}
else if (typeAndValue.getType() instanceof VarcharType) {
statement.setString(i + 1, ((Slice) typeAndValue.getValue()).toStringUtf8());
}
else {
throw new UnsupportedOperationException("Can't handle type: " + typeAndValue.getType());
}
}
return statement;
}
private static boolean isAcceptedType(Type type)
{
Type validType = requireNonNull(type, "type is null");
return validType.equals(BigintType.BIGINT) ||
validType.equals(TinyintType.TINYINT) ||
validType.equals(SmallintType.SMALLINT) ||
validType.equals(IntegerType.INTEGER) ||
validType.equals(DoubleType.DOUBLE) ||
validType.equals(RealType.REAL) ||
validType.equals(BooleanType.BOOLEAN) ||
validType.equals(DateType.DATE) ||
validType.equals(TimeType.TIME) ||
validType.equals(TimeWithTimeZoneType.TIME_WITH_TIME_ZONE) ||
validType.equals(TimestampType.TIMESTAMP) ||
validType.equals(TimestampWithTimeZoneType.TIMESTAMP_WITH_TIME_ZONE) ||
validType instanceof VarcharType;
}
private List<String> toConjuncts(List<JdbcColumnHandle> columns, TupleDomain<ColumnHandle> tupleDomain, List<TypeAndValue> accumulator)
{
ImmutableList.Builder<String> builder = ImmutableList.builder();
for (JdbcColumnHandle column : columns) {
Type type = column.getColumnType();
if (isAcceptedType(type)) {
Domain domain = tupleDomain.getDomains().get().get(column);
if (domain != null) {
builder.add(toPredicate(column.getColumnName(), domain, type, accumulator));
}
}
}
return builder.build();
}
private String toPredicate(String columnName, Domain domain, Type type, List<TypeAndValue> accumulator)
{
checkArgument(domain.getType().isOrderable(), "Domain type must be orderable");
if (domain.getValues().isNone()) {
return domain.isNullAllowed() ? quote(columnName) + " IS NULL" : "FALSE";
}
if (domain.getValues().isAll()) {
return domain.isNullAllowed() ? "TRUE" : quote(columnName) + " IS NOT NULL";
}
List<String> disjuncts = new ArrayList<>();
List<Object> singleValues = new ArrayList<>();
for (Range range : domain.getValues().getRanges().getOrderedRanges()) {
checkState(!range.isAll()); // Already checked
if (range.isSingleValue()) {
singleValues.add(range.getLow().getValue());
}
else {
List<String> rangeConjuncts = new ArrayList<>();
if (!range.getLow().isLowerUnbounded()) {
switch (range.getLow().getBound()) {
case ABOVE:
rangeConjuncts.add(toPredicate(columnName, ">", range.getLow().getValue(), type, accumulator));
break;
case EXACTLY:
rangeConjuncts.add(toPredicate(columnName, ">=", range.getLow().getValue(), type, accumulator));
break;
case BELOW:
throw new IllegalArgumentException("Low marker should never use BELOW bound");
default:
throw new AssertionError("Unhandled bound: " + range.getLow().getBound());
}
}
if (!range.getHigh().isUpperUnbounded()) {
switch (range.getHigh().getBound()) {
case ABOVE:
throw new IllegalArgumentException("High marker should never use ABOVE bound");
case EXACTLY:
rangeConjuncts.add(toPredicate(columnName, "<=", range.getHigh().getValue(), type, accumulator));
break;
case BELOW:
rangeConjuncts.add(toPredicate(columnName, "<", range.getHigh().getValue(), type, accumulator));
break;
default:
throw new AssertionError("Unhandled bound: " + range.getHigh().getBound());
}
}
// If rangeConjuncts is null, then the range was ALL, which should already have been checked for
checkState(!rangeConjuncts.isEmpty());
disjuncts.add("(" + Joiner.on(" AND ").join(rangeConjuncts) + ")");
}
}
// Add back all of the possible single values either as an equality or an IN predicate
if (singleValues.size() == 1) {
disjuncts.add(toPredicate(columnName, "=", getOnlyElement(singleValues), type, accumulator));
}
else if (singleValues.size() > 1) {
for (Object value : singleValues) {
bindValue(value, type, accumulator);
}
String values = Joiner.on(",").join(nCopies(singleValues.size(), "?"));
disjuncts.add(quote(columnName) + " IN (" + values + ")");
}
// Add nullability disjuncts
checkState(!disjuncts.isEmpty());
if (domain.isNullAllowed()) {
disjuncts.add(quote(columnName) + " IS NULL");
}
return "(" + Joiner.on(" OR ").join(disjuncts) + ")";
}
private String toPredicate(String columnName, String operator, Object value, Type type, List<TypeAndValue> accumulator)
{
bindValue(value, type, accumulator);
return quote(columnName) + " " + operator + " ?";
}
private String quote(String name)
{
name = name.replace(quote, quote + quote);
return quote + name + quote;
}
private static void bindValue(Object value, Type type, List<TypeAndValue> accumulator)
{
checkArgument(isAcceptedType(type), "Can't handle type: %s", type);
accumulator.add(new TypeAndValue(type, value));
}
}