Java Tools(四)执行sql文件 （来自Mybatis的代码）
Java Tools(四)执行sql文件 （来自Mybatis的代码）
浏览mybatis代码发现有个比较好的工具类，执行sql文件的，而且除jdk之外无第三方依赖。
org.apache.ibatis.jdbc.ScriptRunner
/**
* Copyright 2009-2018 the original author or authors.
*
* 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 org.apache.ibatis.jdbc;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.io.Reader;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Clinton Begin
*/
public class ScriptRunner {
private static final String LINE_SEPARATOR = System.getProperty("line.separator", "\n");
private static final String DEFAULT_DELIMITER = ";";
private static final Pattern DELIMITER_PATTERN = Pattern.compile("^\\s*((--)|(//))?\\s*(//)?\\s*@DELIMITER\\s+([^\\s]+)", Pattern.CASE_INSENSITIVE);
private final Connection connection;
private boolean stopOnError;
private boolean throwWarning;
private boolean autoCommit;
private boolean sendFullScript;
private boolean removeCRs;
private boolean escapeProcessing = true;
private PrintWriter logWriter = new PrintWriter(System.out);
private PrintWriter errorLogWriter = new PrintWriter(System.err);
private String delimiter = DEFAULT_DELIMITER;
private boolean fullLineDelimiter;
public ScriptRunner(Connection connection) {
this.connection = connection;
}
public void setStopOnError(boolean stopOnError) {
this.stopOnError = stopOnError;
}
public void setThrowWarning(boolean throwWarning) {
this.throwWarning = throwWarning;
}
public void setAutoCommit(boolean autoCommit) {
this.autoCommit = autoCommit;
}
public void setSendFullScript(boolean sendFullScript) {
this.sendFullScript = sendFullScript;
}
public void setRemoveCRs(boolean removeCRs) {
this.removeCRs = removeCRs;
}
/**
* @since 3.1.1
*/
public void setEscapeProcessing(boolean escapeProcessing) {
this.escapeProcessing = escapeProcessing;
}
public void setLogWriter(PrintWriter logWriter) {
this.logWriter = logWriter;
}
public void setErrorLogWriter(PrintWriter errorLogWriter) {
this.errorLogWriter = errorLogWriter;
}
public void setDelimiter(String delimiter) {
this.delimiter = delimiter;
}
public void setFullLineDelimiter(boolean fullLineDelimiter) {
this.fullLineDelimiter = fullLineDelimiter;
}
public void runScript(Reader reader) {
setAutoCommit();
try {
if (sendFullScript) {
executeFullScript(reader);
} else {
executeLineByLine(reader);
}
} finally {
rollbackConnection();
}
}
private void executeFullScript(Reader reader) {
StringBuilder script = new StringBuilder();
try {
BufferedReader lineReader = new BufferedReader(reader);
String line;
while ((line = lineReader.readLine()) != null) {
script.append(line);
script.append(LINE_SEPARATOR);
}
String command = script.toString();
println(command);
executeStatement(command);
commitConnection();
} catch (Exception e) {
String message = "Error executing: " + script + ". Cause: " + e;
printlnError(message);
throw new RuntimeSqlException(message, e);
}
}
private void executeLineByLine(Reader reader) {
StringBuilder command = new StringBuilder();
try {
BufferedReader lineReader = new BufferedReader(reader);
String line;
while ((line = lineReader.readLine()) != null) {
handleLine(command, line);
}
commitConnection();
checkForMissingLineTerminator(command);
} catch (Exception e) {
String message = "Error executing: " + command + ". Cause: " + e;
printlnError(message);
throw new RuntimeSqlException(message, e);
}
}
public void closeConnection() {
try {
connection.close();
} catch (Exception e) {
// ignore
}
}
private void setAutoCommit() {
try {
if (autoCommit != connection.getAutoCommit()) {
connection.setAutoCommit(autoCommit);
}
} catch (Throwable t) {
throw new RuntimeSqlException("Could not set AutoCommit to " + autoCommit + ". Cause: " + t, t);
}
}
private void commitConnection() {
try {
if (!connection.getAutoCommit()) {
connection.commit();
}
} catch (Throwable t) {
throw new RuntimeSqlException("Could not commit transaction. Cause: " + t, t);
}
}
private void rollbackConnection() {
try {
if (!connection.getAutoCommit()) {
connection.rollback();
}
} catch (Throwable t) {
// ignore
}
}
private void checkForMissingLineTerminator(StringBuilder command) {
if (command != null && command.toString().trim().length() > 0) {
throw new RuntimeSqlException("Line missing end-of-line terminator (" + delimiter + ") => " + command);
}
}
private void handleLine(StringBuilder command, String line) throws SQLException {
String trimmedLine = line.trim();
if (lineIsComment(trimmedLine)) {
Matcher matcher = DELIMITER_PATTERN.matcher(trimmedLine);
if (matcher.find()) {
delimiter = matcher.group(5);
}
println(trimmedLine);
} else if (commandReadyToExecute(trimmedLine)) {
command.append(line.substring(0, line.lastIndexOf(delimiter)));
command.append(LINE_SEPARATOR);
println(command);
executeStatement(command.toString());
command.setLength(0);
} else if (trimmedLine.length() > 0) {
command.append(line);
command.append(LINE_SEPARATOR);
}
}
private boolean lineIsComment(String trimmedLine) {
return trimmedLine.startsWith("//") || trimmedLine.startsWith("--");
}
private boolean commandReadyToExecute(String trimmedLine) {
// issue #561 remove anything after the delimiter
return !fullLineDelimiter && trimmedLine.contains(delimiter) || fullLineDelimiter && trimmedLine.equals(delimiter);
}
private void executeStatement(String command) throws SQLException {
Statement statement = connection.createStatement();
try {
statement.setEscapeProcessing(escapeProcessing);
String sql = command;
if (removeCRs) {
sql = sql.replaceAll("\r\n", "\n");
}
try {
boolean hasResults = statement.execute(sql);
while (!(!hasResults && statement.getUpdateCount() == -1)) {
checkWarnings(statement);
printResults(statement, hasResults);
hasResults = statement.getMoreResults();
}
} catch (SQLWarning e) {
throw e;
} catch (SQLException e) {
if (stopOnError) {
throw e;
} else {
String message = "Error executing: " + command + ". Cause: " + e;
printlnError(message);
}
}
} finally {
try {
statement.close();
} catch (Exception e) {
// Ignore to workaround a bug in some connection pools
// (Does anyone know the details of the bug?)
}
}
}
private void checkWarnings(Statement statement) throws SQLException {
if (!throwWarning) {
return;
}
// In Oracle, CREATE PROCEDURE, FUNCTION, etc. returns warning
// instead of throwing exception if there is compilation error.
SQLWarning warning = statement.getWarnings();
if (warning != null) {
throw warning;
}
}
private void printResults(Statement statement, boolean hasResults) {
if (!hasResults) {
return;
}
try (ResultSet rs = statement.getResultSet()) {
ResultSetMetaData md = rs.getMetaData();
int cols = md.getColumnCount();
for (int i = 0; i < cols; i++) {
String name = md.getColumnLabel(i + 1);
print(name + "\t");
}
println("");
while (rs.next()) {
for (int i = 0; i < cols; i++) {
String value = rs.getString(i + 1);
print(value + "\t");
}
println("");
}
} catch (SQLException e) {
printlnError("Error printing results: " + e.getMessage());
}
}
private void print(Object o) {
if (logWriter != null) {
logWriter.print(o);
logWriter.flush();
}
}
private void println(Object o) {
if (logWriter != null) {
logWriter.println(o);
logWriter.flush();
}
}
private void printlnError(Object o) {
if (errorLogWriter != null) {
errorLogWriter.println(o);
errorLogWriter.flush();
}
}
}
具体使用推荐看这篇文章：
https://blog.csdn.net/dream_broken/article/details/54340482