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/*
* JdbcHelper.java Jul 28 2016, 15:39
*
* Copyright 2016 Drunken Dev.
*
* 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.drunkendev.jdbc;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UncheckedIOException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Optional;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowMapper;
import static java.lang.Character.isWhitespace;
/**
* Utilities for working with JDBC.
*
* Methods within may be for working with {@link JdbcTemplate} or SQL files.
*
* @author Brett Ryan
* @since 1.0
*/
public class JdbcHelper {
private static final int INIT = 0;
private static final int ISA_MINUS = 1;
private static final int ISI_LINE_COMMENT = 2;
private static final int ISA_SLASH = 3;
private static final int ISI_BLOCK_COMMENT = 4;
private static final int ISA_BCOMMENT_STAR = 5;
private static final int ISI_DOUBLE_QUOTE = 6;
private static final int ISI_SINGLE_QUOTE = 7;
private static final int ISI_SQUARE_QUOTE = 8;
/**
* Given an input file path will return the textual contents with comments removed.
*
* SQL files may either contain single line comments {@code --} or block comments /* */
*
* @param file
* Input stream containing SQL content.
* @return Textual content with both line and block comments removed.
* @since 1.0
*/
public static String getSql(String file) {
return getSql(Paths.get(file));
}
/**
* Given an input file path will return the textual contents with comments removed.
*
* SQL files may either contain single line comments {@code --} or block comments /* */
*
* @param file
* Input stream containing SQL content.
* @return Textual content with both line and block comments removed.
* @since 1.1
*/
public static String getSql(Path file) {
try (InputStream stream = Files.newInputStream(file)) {
return getSql(stream);
} catch (IOException ex) {
throw new UncheckedIOException(ex.getMessage(), ex);
}
}
/**
* Given an input stream will return the textual contents with comments removed.
*
* SQL files may either contain single line comments {@code --} or block comments /* */
*
* @param is
* Input stream containing SQL content.
* @return Textual content with both line and block comments removed.
*/
public static String getSql(InputStream is) {
StringBuilder res = new StringBuilder();
try (BufferedReader r = new BufferedReader(new InputStreamReader(is))) {
int cc;
char c;
int state = INIT;
boolean prevNewLine = false;
while ((cc = r.read()) != -1) {
c = (char) cc;
switch (state) {
case INIT:
switch (c) {
case '-':
state = ISA_MINUS;
break;
case '/':
state = ISA_SLASH;
break;
case '\'':
state = ISI_SINGLE_QUOTE;
res.append(c);
break;
case '"':
state = ISI_DOUBLE_QUOTE;
res.append(c);
break;
case '[':
state = ISI_SQUARE_QUOTE;
res.append(c);
break;
default:
if (c == '\n' || c == '\r') {
if (!prevNewLine && res.length() > 0) {
res.append('\n');
prevNewLine = true;
}
} else if (isWhitespace(c)) {
if (res.length() > 0) {
res.append(c);
prevNewLine = false;
}
} else {
res.append(c);
prevNewLine = false;
}
break;
}
break;
case ISA_MINUS:
if (c == '-') {
state = ISI_LINE_COMMENT;
} else {
state = INIT;
res.append('-');
res.append(c);
}
break;
case ISI_LINE_COMMENT:
if (c == '\n' || c == '\r') {
if (res.length() > 0) {
if (!prevNewLine) {
res.append('\n');
}
prevNewLine = true;
}
state = INIT;
}
break;
case ISA_SLASH:
if (c == '*') {
state = ISI_BLOCK_COMMENT;
} else {
state = INIT;
res.append('/');
res.append(c);
prevNewLine = false;
}
break;
case ISI_BLOCK_COMMENT:
if (c == '*') {
state = ISA_BCOMMENT_STAR;
}
break;
case ISA_BCOMMENT_STAR:
state = c == '/' ? INIT : ISI_BLOCK_COMMENT;
break;
case ISI_SINGLE_QUOTE:
res.append(c);
if (c == '\'') {
state = INIT;
}
break;
case ISI_DOUBLE_QUOTE:
res.append(c);
if (c == '"') {
state = INIT;
}
break;
case ISI_SQUARE_QUOTE:
res.append(c);
if (c == ']') {
state = INIT;
}
break;
}
}
switch (state) {
case ISA_MINUS:
res.append('-');
break;
case ISA_SLASH:
res.append('/');
break;
}
} catch (IOException ex) {
throw new UncheckedIOException(ex.getMessage(), ex);
}
return res.toString();
}
public static RowMapper booleanMapper(int col) {
return (rs, i) -> rs.getBoolean(col);
}
public static RowMapper byteMapper(int col) {
return (rs, i) -> rs.getByte(col);
}
public static RowMapper dateMapper(int col) {
return (rs, i) -> rs.getDate(col);
}
public static RowMapper floatMapper(int col) {
return (rs, i) -> rs.getFloat(col);
}
public static RowMapper doubleMapper(int col) {
return (rs, i) -> rs.getDouble(col);
}
public static RowMapper intMapper(int col) {
return (rs, i) -> rs.getInt(col);
}
public static RowMapper longMapper(int col) {
return (rs, i) -> rs.getLong(col);
}
public static RowMapper nstringMapper(int col) {
return (rs, i) -> rs.getNString(col);
}
public static RowMapper objectMapper(int col) {
return (rs, i) -> (T) rs.getObject(col);
}
public static RowMapper shortMapper(int col) {
return (rs, i) -> rs.getShort(col);
}
public static RowMapper stringMapper(int col) {
return (rs, i) -> rs.getString(col);
}
public static RowMapper
