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The AceQL Java Client SDK allows to wrap the AceQL HTTP APIs and eliminate the tedious works of handling communications errors and parsing JSON results.
Android and Java Desktop application developers can access remote SQL databases and/or SQL databases in the cloud by simply including standard JDBC calls in their code, just like they would for a local database.
/*
* This file is part of AceQL Client SDK.
* AceQL Client SDK: Remote JDBC access over HTTP with AceQL HTTP.
* Copyright (C) 2017, KawanSoft SAS
* (http://www.kawansoft.com). All rights reserved.
*
* 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.aceql.client.jdbc;
import java.io.Closeable;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.util.Map;
import org.kawanfw.driver.jdbc.abstracts.AbstractResultSet;
import com.aceql.client.jdbc.http.AceQLHttpApi;
import com.aceql.client.jdbc.util.AceQLResultSetUtil;
import com.aceql.client.jdbc.util.json.RowParser;
/**
* Class that allows to built a {@code ResultSet} from a JSON file or JSON
* String returned by an /execute_query call.
*
* @author Nicolas de Pomereu
*
*/
class AceQLResultSet extends AbstractResultSet implements ResultSet, Closeable {
public boolean DEBUG = false;
/** A File containing the result set returned by an /execute_query call */
public File jsonFile = null;
private int rowCount = 0;
private int currentRowNum = 0;
// public Map valuesPerColName;
public Map valuesPerColIndex;
private boolean isClosed = false;
private Statement statement = null;
private RowParser rowParser;
private AceQLHttpApi aceQLHttpApi = null;
/** Says if the last accessed value was null */
private boolean wasNull = false;
/**
* Constructor.
*
* @param jsonFile
* A file containing the result set returned by an /execute_query
* call
* @param statement
* the calling Statement
* @param rowCount the numbers of row in the Json result set file
* @throws SQLException
* if file is null or does no exist
*/
public AceQLResultSet(File jsonFile, Statement statement, int rowCount)
throws SQLException {
if (jsonFile == null) {
throw new SQLException("jsonFile is null!");
}
if (!jsonFile.exists()) {
throw new SQLException(new FileNotFoundException(
"jsonFile does not exist: " + jsonFile));
}
this.jsonFile = jsonFile;
this.statement = statement;
AceQLConnection aceQLConnection = (AceQLConnection) this.getStatement()
.getConnection();
this.aceQLHttpApi = aceQLConnection.aceQLHttpApi;
this.rowParser = new RowParser(jsonFile);
long begin = System.currentTimeMillis();
debug(new java.util.Date() + " Begin getRowCount");
this.rowCount = rowCount;
long end = System.currentTimeMillis();
debug(new java.util.Date() + " End getRowCount: " + rowCount);
debug("Elapsed = " + (end - begin));
}
/**
* @param row
* @return
* @throws SQLException
* @see java.sql.ResultSet#absolute(int)
*/
@Override
public boolean absolute(int row) throws SQLException {
if (isClosed) {
throw new SQLException("ResultSet is closed.");
}
if (row < 0 || row > rowCount) {
return false;
}
rowParser.resetParser();
currentRowNum = row;
rowParser.buildRowNum(row);
return true;
}
/**
* @return
* @throws SQLException
* @see java.sql.ResultSet#previous()
*/
public boolean previous() throws SQLException {
if (isClosed) {
throw new SQLException("ResultSet is closed.");
}
if (currentRowNum == 1) {
return false;
}
currentRowNum--;
rowParser.buildRowNum(currentRowNum);
valuesPerColIndex = rowParser.getValuesPerColIndex();
// valuesPerColName = rowParser.getValuesPerColName();
debug("");
debug("" + valuesPerColIndex);
// debug("" + valuesPerColName);
return true;
}
public boolean next() throws SQLException {
if (isClosed) {
throw new SQLException("ResltSetWrapper is closed.");
}
if (currentRowNum == rowCount) {
return false;
}
currentRowNum++;
rowParser.buildRowNum(currentRowNum);
valuesPerColIndex = rowParser.getValuesPerColIndex();
// valuesPerColName = rowParser.getValuesPerColName();
debug("");
debug("valuesPerColIndex: " + valuesPerColIndex);
// debug("valuesPerColName :" + valuesPerColName);
return true;
}
/**
* @return
* @throws SQLException
* @see java.sql.ResultSet#first()
*/
public boolean first() throws SQLException {
return absolute(1);
}
/**
* @return
* @throws SQLException
* @see java.sql.ResultSet#last()
*/
public boolean last() throws SQLException {
return absolute(rowCount);
}
private InputStream getInputStream(String blobId) throws SQLException {
// long length = aceQLHttpApi.getBlobLength(blobId);
// AceQLConnection aceQLConnection =
// (AceQLConnection)this.getStatement().getConnection();
// blobDownload(blobId, file, aceQLConnection.getProgress(),
// aceQLConnection.getCancelled(), length);
InputStream in = aceQLHttpApi.blobDownload(blobId);
return in;
}
/*
* (non-Javadoc)
*
* @see org.kawanfw.driver.jdbc.abstracts.AbstractResultSet#getStatement()
*/
@Override
public Statement getStatement() throws SQLException {
return this.statement;
}
private String getStringValue(int index) throws SQLException {
if (isClosed) {
throw new SQLException("ResultSet is closed.");
}
String value = valuesPerColIndex.get(index);
if (value == null) {
throw new SQLException("Invalid column index: " + index);
}
wasNull = false;
if (value.equalsIgnoreCase("NULL")) {
wasNull = true;
}
return value;
}
private String getStringValue(String string) throws SQLException {
if (isClosed) {
throw new SQLException("ResultSet is closed.");
}
if (string == null) {
throw new SQLException("Invalid column name: " + string);
}
if (rowParser.getIndexsPerColName().get(string) == null) {
throw new SQLException("Invalid column name: " + string);
}
int index = rowParser.getIndexsPerColName().get(string);
String value = valuesPerColIndex.get(index);
if (value == null) {
throw new SQLException("Invalid column name: " + string);
}
wasNull = false;
if (value.equalsIgnoreCase("NULL")) {
wasNull = true;
}
return value;
}
/**
* Reports whether the last column read had a value of SQL NULL
* . Note that you must first call one of the getter methods on a column to
* try to read its value and then call the method wasNull to
* see if the value read was SQL NULL.
*
* @return true if the last column value read was SQL
* NULL and false otherwise
* @exception SQLException
* if a database access error occurs
*/
@Override
public boolean wasNull() throws SQLException {
;
return wasNull;
}
/*
* (non-Javadoc)
*
* @see
* org.kawanfw.driver.jdbc.abstracts.AbstractResultSet#getBinaryStream(int)
*/
@Override
public InputStream getBinaryStream(int columnIndex) throws SQLException {
String value = getString(columnIndex);
if (value.equals("NULL")) {
return null;
}
return getInputStream(value);
}
/*
* (non-Javadoc)
*
* @see
* org.kawanfw.driver.jdbc.abstracts.AbstractResultSet#getBinaryStream(java.
* lang.String)
*/
@Override
public InputStream getBinaryStream(String columnName) throws SQLException {
String value = getString(columnName);
if (value == null || value.equals("NULL")) {
return null;
}
return getInputStream(value);
}
public String getString(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return null;
}
return value;
}
public int getInt(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return 0;
}
return AceQLResultSetUtil.getIntValue(value);
}
public BigDecimal getBigDecimal(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return null;
}
return AceQLResultSetUtil.getBigDecimalValue(value);
}
public Date getDate(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return null;
}
return AceQLResultSetUtil.getDateValue(value);
}
public Timestamp getTimestamp(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return null;
}
return AceQLResultSetUtil.getTimestampValue(value);
}
public boolean getBoolean(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return false;
}
return Boolean.parseBoolean(value);
}
public short getShort(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return 0;
}
return AceQLResultSetUtil.getShortValue(value);
}
public float getFloat(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return (float) 0;
}
return AceQLResultSetUtil.getFloatValue(value);
}
public double getDouble(String columnLabel) throws SQLException {
String value = getStringValue(columnLabel);
if (value == null || value.equals("NULL")) {
return (double) 0;
}
return AceQLResultSetUtil.getDoubleValue(value);
}
public String getString(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return null;
}
return value;
}
public int getInt(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return 0;
}
return AceQLResultSetUtil.getIntValue(value);
}
public BigDecimal getBigDecimal(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return null;
}
return AceQLResultSetUtil.getBigDecimalValue(value);
}
public Date getDate(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return null;
}
return AceQLResultSetUtil.getDateValue(value);
}
public Timestamp getTimestamp(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return null;
}
return AceQLResultSetUtil.getTimestampValue(value);
}
public boolean getBoolean(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return false;
}
return Boolean.parseBoolean(value);
}
public short getShort(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return 0;
}
return AceQLResultSetUtil.getShortValue(value);
}
public float getFloat(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return (float) 0;
}
return AceQLResultSetUtil.getFloatValue(value);
}
public double getDouble(int columnIndex) throws SQLException {
String value = getStringValue(columnIndex);
if (value == null || value.equals("NULL")) {
return (double) 0;
}
return AceQLResultSetUtil.getDoubleValue(value);
}
/**
* @return
* @throws SQLException
* @see java.sql.ResultSet#isClosed()
*/
public boolean isClosed() throws SQLException {
return isClosed;
}
public void close() {
rowParser.close();
isClosed = true;
if (!DEBUG) {
jsonFile.delete();
}
}
/**
* Says if trace is on
*
* @return true if trace is on
*/
public boolean isTraceOn() {
return rowParser.isTraceOn();
}
/**
* Sets the trace on/off
*
* @param traceOn
* if true, trace will be on
*/
public void setTraceOn(boolean traceOn) {
rowParser.setTraceOn(traceOn);
}
private void debug(String s) {
if (DEBUG) {
System.out.println(new java.util.Date() + " " + s);
}
}
}