forked from googleapis/java-spanner
/
JdbcResultSet.java
686 lines (594 loc) · 21 KB
/
JdbcResultSet.java
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/*
* Copyright 2019 Google LLC
*
* 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.google.cloud.spanner.jdbc;
import com.google.cloud.spanner.Type;
import com.google.cloud.spanner.Type.Code;
import com.google.common.base.Preconditions;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Date;
import java.sql.NClob;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.List;
import java.util.Map;
/** Implementation of {@link ResultSet} for Cloud Spanner */
class JdbcResultSet extends AbstractJdbcResultSet {
static JdbcResultSet of(com.google.cloud.spanner.ResultSet resultSet) {
Preconditions.checkNotNull(resultSet);
return new JdbcResultSet(null, resultSet);
}
static JdbcResultSet of(Statement statement, com.google.cloud.spanner.ResultSet resultSet) {
Preconditions.checkNotNull(statement);
Preconditions.checkNotNull(resultSet);
return new JdbcResultSet(statement, resultSet);
}
private boolean closed = false;
private final Statement statement;
private boolean wasNull = false;
private boolean nextReturnedFalse = false;
private boolean nextCalledForMetaData = false;
private boolean nextCalledForMetaDataResult = false;
private long currentRow = 0L;
private JdbcResultSet(Statement statement, com.google.cloud.spanner.ResultSet spanner) {
super(spanner);
this.statement = statement;
}
void checkClosedAndValidRow() throws SQLException {
checkClosed();
if (currentRow == 0L) {
throw JdbcSqlExceptionFactory.of(
"ResultSet is before first row. Call next() first.",
com.google.rpc.Code.FAILED_PRECONDITION);
}
if (nextReturnedFalse) {
throw JdbcSqlExceptionFactory.of(
"ResultSet is after last row. There is no more data available.",
com.google.rpc.Code.FAILED_PRECONDITION);
}
}
@Override
public boolean next() throws SQLException {
checkClosed();
currentRow++;
if (nextCalledForMetaData) {
nextReturnedFalse = !nextCalledForMetaDataResult;
nextCalledForMetaData = false;
} else {
nextReturnedFalse = !spanner.next();
}
return !nextReturnedFalse;
}
@Override
public void close() throws SQLException {
spanner.close();
this.closed = true;
}
@Override
public boolean wasNull() throws SQLException {
checkClosedAndValidRow();
return wasNull;
}
private boolean isNull(int columnIndex) {
wasNull = spanner.isNull(columnIndex - 1);
return wasNull;
}
private boolean isNull(String columnName) {
wasNull = spanner.isNull(columnName);
return wasNull;
}
@Override
public String getString(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex) ? null : spanner.getString(columnIndex - 1);
}
@Override
public boolean getBoolean(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex) ? false : spanner.getBoolean(columnIndex - 1);
}
@Override
public byte getByte(int columnIndex) throws SQLException {
checkClosedAndValidRow();
long val = isNull(columnIndex) ? 0L : spanner.getLong(columnIndex - 1);
return checkedCastToByte(val);
}
@Override
public short getShort(int columnIndex) throws SQLException {
checkClosedAndValidRow();
long val = isNull(columnIndex) ? 0L : spanner.getLong(columnIndex - 1);
return checkedCastToShort(val);
}
@Override
public int getInt(int columnIndex) throws SQLException {
checkClosedAndValidRow();
long val = isNull(columnIndex) ? 0L : spanner.getLong(columnIndex - 1);
return checkedCastToInt(val);
}
@Override
public long getLong(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex) ? 0L : spanner.getLong(columnIndex - 1);
}
@Override
public float getFloat(int columnIndex) throws SQLException {
checkClosedAndValidRow();
double val = isNull(columnIndex) ? 0D : spanner.getDouble(columnIndex - 1);
return checkedCastToFloat(val);
}
@Override
public double getDouble(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex) ? 0D : spanner.getDouble(columnIndex - 1);
}
@Override
public byte[] getBytes(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex) ? null : spanner.getBytes(columnIndex - 1).toByteArray();
}
@Override
public Date getDate(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex)
? null
: JdbcTypeConverter.toSqlDate(spanner.getDate(columnIndex - 1));
}
@Override
public Time getTime(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex)
? null
: JdbcTypeConverter.toSqlTime(spanner.getTimestamp(columnIndex - 1));
}
@Override
public Timestamp getTimestamp(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex)
? null
: JdbcTypeConverter.toSqlTimestamp(spanner.getTimestamp(columnIndex - 1));
}
private InputStream getInputStream(String val, Charset charset) {
if (val == null) return null;
byte[] b = val.getBytes(charset);
return new ByteArrayInputStream(b);
}
@Override
public InputStream getAsciiStream(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return getInputStream(getString(columnIndex), StandardCharsets.US_ASCII);
}
@Override
@Deprecated
public InputStream getUnicodeStream(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return getInputStream(getString(columnIndex), StandardCharsets.UTF_16LE);
}
@Override
public InputStream getBinaryStream(int columnIndex) throws SQLException {
checkClosedAndValidRow();
byte[] val = getBytes(columnIndex);
return val == null ? null : new ByteArrayInputStream(val);
}
@Override
public String getString(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel) ? null : spanner.getString(columnLabel);
}
@Override
public boolean getBoolean(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel) ? false : spanner.getBoolean(columnLabel);
}
@Override
public byte getByte(String columnLabel) throws SQLException {
checkClosedAndValidRow();
long val = isNull(columnLabel) ? 0L : spanner.getLong(columnLabel);
return checkedCastToByte(val);
}
@Override
public short getShort(String columnLabel) throws SQLException {
checkClosedAndValidRow();
long val = isNull(columnLabel) ? 0L : spanner.getLong(columnLabel);
return checkedCastToShort(val);
}
@Override
public int getInt(String columnLabel) throws SQLException {
checkClosedAndValidRow();
long val = isNull(columnLabel) ? 0L : spanner.getLong(columnLabel);
return checkedCastToInt(val);
}
@Override
public long getLong(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel) ? 0L : spanner.getLong(columnLabel);
}
@Override
public float getFloat(String columnLabel) throws SQLException {
checkClosedAndValidRow();
double val = isNull(columnLabel) ? 0D : spanner.getDouble(columnLabel);
return checkedCastToFloat(val);
}
@Override
public double getDouble(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel) ? 0D : spanner.getDouble(columnLabel);
}
@Override
public byte[] getBytes(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel) ? null : spanner.getBytes(columnLabel).toByteArray();
}
@Override
public Date getDate(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel) ? null : JdbcTypeConverter.toSqlDate(spanner.getDate(columnLabel));
}
@Override
public Time getTime(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel)
? null
: JdbcTypeConverter.toSqlTime(spanner.getTimestamp(columnLabel));
}
@Override
public Timestamp getTimestamp(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel)
? null
: JdbcTypeConverter.toSqlTimestamp(spanner.getTimestamp(columnLabel));
}
@Override
public InputStream getAsciiStream(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getInputStream(getString(columnLabel), StandardCharsets.US_ASCII);
}
@Override
@Deprecated
public InputStream getUnicodeStream(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getInputStream(getString(columnLabel), StandardCharsets.UTF_16LE);
}
@Override
public InputStream getBinaryStream(String columnLabel) throws SQLException {
checkClosedAndValidRow();
byte[] val = getBytes(columnLabel);
return val == null ? null : new ByteArrayInputStream(val);
}
@Override
public JdbcResultSetMetaData getMetaData() throws SQLException {
checkClosed();
if (isBeforeFirst()) {
// do a call to next() on the underlying resultset to initialize metadata
nextCalledForMetaData = true;
nextCalledForMetaDataResult = spanner.next();
}
return new JdbcResultSetMetaData(this, statement);
}
@Override
public Object getObject(String columnLabel) throws SQLException {
checkClosedAndValidRow();
Type type = spanner.getColumnType(columnLabel);
return isNull(columnLabel) ? null : getObject(type, columnLabel);
}
@Override
public Object getObject(int columnIndex) throws SQLException {
checkClosedAndValidRow();
Type type = spanner.getColumnType(columnIndex - 1);
return isNull(columnIndex) ? null : getObject(type, columnIndex);
}
private Object getObject(Type type, String columnLabel) throws SQLException {
return getObject(type, spanner.getColumnIndex(columnLabel) + 1);
}
private Object getObject(Type type, int columnIndex) throws SQLException {
if (type == Type.bool()) return getBoolean(columnIndex);
if (type == Type.bytes()) return getBytes(columnIndex);
if (type == Type.date()) return getDate(columnIndex);
if (type == Type.float64()) return getDouble(columnIndex);
if (type == Type.int64()) return getLong(columnIndex);
if (type == Type.string()) return getString(columnIndex);
if (type == Type.timestamp()) return getTimestamp(columnIndex);
if (type.getCode() == Code.ARRAY) return getArray(columnIndex);
throw JdbcSqlExceptionFactory.of(
"Unknown type: " + type.toString(), com.google.rpc.Code.INVALID_ARGUMENT);
}
@Override
public int findColumn(String columnLabel) throws SQLException {
checkClosed();
try {
return spanner.getColumnIndex(columnLabel) + 1;
} catch (IllegalArgumentException e) {
throw JdbcSqlExceptionFactory.of(
"no column with label " + columnLabel + " found", com.google.rpc.Code.INVALID_ARGUMENT);
}
}
@Override
public Reader getCharacterStream(int columnIndex) throws SQLException {
checkClosedAndValidRow();
String val = getString(columnIndex);
return val == null ? null : new StringReader(val);
}
@Override
public Reader getCharacterStream(String columnLabel) throws SQLException {
checkClosedAndValidRow();
String val = getString(columnLabel);
return val == null ? null : new StringReader(val);
}
@Override
public BigDecimal getBigDecimal(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return getBigDecimal(columnIndex, false, 0);
}
@Override
public BigDecimal getBigDecimal(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getBigDecimal(spanner.getColumnIndex(columnLabel) + 1, false, 0);
}
@Override
@Deprecated
public BigDecimal getBigDecimal(int columnIndex, int scale) throws SQLException {
checkClosedAndValidRow();
return getBigDecimal(columnIndex, true, scale);
}
@Override
@Deprecated
public BigDecimal getBigDecimal(String columnLabel, int scale) throws SQLException {
checkClosedAndValidRow();
return getBigDecimal(spanner.getColumnIndex(columnLabel) + 1, true, scale);
}
private BigDecimal getBigDecimal(int columnIndex, boolean fixedScale, int scale)
throws SQLException {
Type type = spanner.getColumnType(columnIndex - 1);
BigDecimal res;
if (isNull(columnIndex)) {
res = null;
} else {
if (type.getCode() == Code.STRING) {
try {
res = new BigDecimal(spanner.getString(columnIndex - 1));
} catch (NumberFormatException e) {
throw JdbcSqlExceptionFactory.of(
"The column does not contain a valid BigDecimal",
com.google.rpc.Code.INVALID_ARGUMENT,
e);
}
} else if (type.getCode() == Code.INT64) {
res = BigDecimal.valueOf(spanner.getLong(columnIndex - 1));
} else if (type.getCode() == Code.FLOAT64) {
res = BigDecimal.valueOf(spanner.getDouble(columnIndex - 1));
} else {
throw JdbcSqlExceptionFactory.of(
"The column does not contain a valid BigDecimal", com.google.rpc.Code.INVALID_ARGUMENT);
}
if (fixedScale) {
res = res.setScale(scale, RoundingMode.HALF_UP);
}
}
return res;
}
@Override
public boolean isBeforeFirst() throws SQLException {
checkClosed();
return currentRow == 0L;
}
@Override
public boolean isAfterLast() throws SQLException {
checkClosed();
return nextReturnedFalse;
}
@Override
public boolean isFirst() throws SQLException {
checkClosed();
return currentRow == 1L;
}
@Override
public int getRow() throws SQLException {
checkClosed();
return checkedCastToInt(currentRow);
}
@Override
public Statement getStatement() throws SQLException {
checkClosed();
return statement;
}
@Override
public Array getArray(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getArray(findColumn(columnLabel));
}
@Override
public Array getArray(int columnIndex) throws SQLException {
checkClosedAndValidRow();
if (isNull(columnIndex)) return null;
Type type = spanner.getColumnType(columnIndex - 1);
if (type.getCode() != Code.ARRAY)
throw JdbcSqlExceptionFactory.of(
"Column with index " + columnIndex + " does not contain an array",
com.google.rpc.Code.INVALID_ARGUMENT);
JdbcDataType dataType = JdbcDataType.getType(type.getArrayElementType().getCode());
List<? extends Object> elements = dataType.getArrayElements(spanner, columnIndex - 1);
return JdbcArray.createArray(dataType, elements);
}
@Override
public Date getDate(int columnIndex, Calendar cal) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex)
? null
: JdbcTypeConverter.toSqlDate(spanner.getDate(columnIndex - 1), cal);
}
@Override
public Date getDate(String columnLabel, Calendar cal) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel)
? null
: JdbcTypeConverter.toSqlDate(spanner.getDate(columnLabel), cal);
}
@Override
public Time getTime(int columnIndex, Calendar cal) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex)
? null
: JdbcTypeConverter.toSqlTime(spanner.getTimestamp(columnIndex - 1), cal);
}
@Override
public Time getTime(String columnLabel, Calendar cal) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel)
? null
: JdbcTypeConverter.toSqlTime(spanner.getTimestamp(columnLabel), cal);
}
@Override
public Timestamp getTimestamp(int columnIndex, Calendar cal) throws SQLException {
checkClosedAndValidRow();
return isNull(columnIndex)
? null
: JdbcTypeConverter.getAsSqlTimestamp(spanner.getTimestamp(columnIndex - 1), cal);
}
@Override
public Timestamp getTimestamp(String columnLabel, Calendar cal) throws SQLException {
checkClosedAndValidRow();
return isNull(columnLabel)
? null
: JdbcTypeConverter.getAsSqlTimestamp(spanner.getTimestamp(columnLabel), cal);
}
@Override
public URL getURL(int columnIndex) throws SQLException {
checkClosedAndValidRow();
try {
return isNull(columnIndex) ? null : new URL(spanner.getString(columnIndex - 1));
} catch (MalformedURLException e) {
throw JdbcSqlExceptionFactory.of(
"Invalid URL: " + spanner.getString(columnIndex - 1),
com.google.rpc.Code.INVALID_ARGUMENT);
}
}
@Override
public URL getURL(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getURL(findColumn(columnLabel));
}
@Override
public int getHoldability() throws SQLException {
checkClosed();
return CLOSE_CURSORS_AT_COMMIT;
}
@Override
public boolean isClosed() throws SQLException {
return closed;
}
@Override
public String getNString(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return getString(columnIndex);
}
@Override
public String getNString(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getString(columnLabel);
}
@Override
public Reader getNCharacterStream(int columnIndex) throws SQLException {
checkClosedAndValidRow();
return getCharacterStream(columnIndex);
}
@Override
public Reader getNCharacterStream(String columnLabel) throws SQLException {
checkClosedAndValidRow();
return getCharacterStream(columnLabel);
}
@Override
public <T> T getObject(int columnIndex, Class<T> type) throws SQLException {
checkClosedAndValidRow();
return convertObject(getObject(columnIndex), type, spanner.getColumnType(columnIndex - 1));
}
@Override
public <T> T getObject(String columnLabel, Class<T> type) throws SQLException {
checkClosedAndValidRow();
return convertObject(getObject(columnLabel), type, spanner.getColumnType(columnLabel));
}
@Override
public Object getObject(int columnIndex, Map<String, Class<?>> map) throws SQLException {
checkClosedAndValidRow();
return convertObject(getObject(columnIndex), map, spanner.getColumnType(columnIndex - 1));
}
@Override
public Object getObject(String columnLabel, Map<String, Class<?>> map) throws SQLException {
checkClosedAndValidRow();
return convertObject(getObject(columnLabel), map, spanner.getColumnType(columnLabel));
}
@Override
public Blob getBlob(int columnIndex) throws SQLException {
checkClosedAndValidRow();
byte[] val = getBytes(columnIndex);
return val == null ? null : new JdbcBlob(val);
}
@Override
public Blob getBlob(String columnLabel) throws SQLException {
checkClosedAndValidRow();
byte[] val = getBytes(columnLabel);
return val == null ? null : new JdbcBlob(val);
}
@Override
public Clob getClob(int columnIndex) throws SQLException {
checkClosedAndValidRow();
String val = getString(columnIndex);
return val == null ? null : new JdbcClob(val);
}
@Override
public Clob getClob(String columnLabel) throws SQLException {
checkClosedAndValidRow();
String val = getString(columnLabel);
return val == null ? null : new JdbcClob(val);
}
@Override
public NClob getNClob(int columnIndex) throws SQLException {
checkClosedAndValidRow();
String val = getString(columnIndex);
return val == null ? null : new JdbcClob(val);
}
@Override
public NClob getNClob(String columnLabel) throws SQLException {
checkClosedAndValidRow();
String val = getString(columnLabel);
return val == null ? null : new JdbcClob(val);
}
@SuppressWarnings("unchecked")
private <T> T convertObject(Object o, Class<T> javaType, Type type) throws SQLException {
return (T) JdbcTypeConverter.convert(o, type, javaType);
}
private Object convertObject(Object o, Map<String, Class<?>> map, Type type) throws SQLException {
if (map == null)
throw JdbcSqlExceptionFactory.of("Map may not be null", com.google.rpc.Code.INVALID_ARGUMENT);
if (o == null) return null;
Class<?> javaType = map.get(type.getCode().name());
if (javaType == null) return o;
return JdbcTypeConverter.convert(o, type, javaType);
}
}