這篇文件主要介紹在Java中嵌入式MySQL的使用,對于一些的應(yīng)用項目,提供安裝版的Mysql,Oracle是必須的工作。但是有時候如果是一個小的工具,可安裝或者移植性比較強的小軟件。再去安裝數(shù)據(jù)庫可能就比較麻煩了。
其實MySQL也有嵌入式的,不需要安裝,在使用的過程中,會自動創(chuàng)建數(shù)據(jù)庫以及通過代碼的方式啟動或者關(guān)閉。下面提供一些代碼片段,具體的會提供下載地址。
這個是核心代碼類,這個類實現(xiàn)了Mysql 的啟動和停止以及數(shù)據(jù)庫的啟動狀態(tài)。
package net.simple.mysql; import java.io.File; import java.util.HashMap; import java.util.Map; import java.util.Properties; import java.util.Set; import com.mysql.management.MysqldResource; /** * * @author 李巖飛 * @email eliyanfei@126.com * 2016年11月2日 下午1:44:55 * */ public final class EmbedMySqlServer { private MysqldResource mysqlInstance; //配置信息 public final Properties props; //端口信息 private String port; /** * 考慮到數(shù)據(jù)庫的性能問題,允許將數(shù)據(jù)庫放在其它磁盤 */ private String embedMySqlHome; public EmbedMySqlServer(final Properties props) { this.props = props; } public EmbedMySqlServer(final Properties props, String embedMySqlHome) { this.embedMySqlHome = embedMySqlHome; this.props = props; } public final String getEmbedMySqlHome() { return null == embedMySqlHome ? getPlatformBaseDir() : embedMySqlHome; } /** * 獲得當(dāng)前應(yīng)用主目錄 * @return 當(dāng)前應(yīng)用啟動程序所在目錄. */ public static String getPlatformBaseDir() { return System.getProperty("user.dir"); } public static boolean isBlank(final String str) { int strLen; if (str == null || (strLen = str.length()) == 0) { return true; } for (int i = 0; i < strLen; i++) { if (Character.isWhitespace(str.charAt(i)) == false) { return false; } } return true; } public void startup() { final File baseDir = new File(getEmbedMySqlHome(), "mysql-em"); mysqlInstance = new MysqldResource(baseDir); port = props.getProperty("port"); if (isBlank(port)) props.put("port", port = String.valueOf((int) (Math.random() * 40000))); final Set<Object> keys = props.keySet(); final Map<String, String> options = new HashMap<String, String>(keys.size()); for (final Object key : keys) { final String val = props.getProperty(key.toString()); if ("".equals(val)) options.put(key.toString(), null); else options.put(key.toString(), val.replace("{$contextPath}", getPlatformBaseDir())); } if (!mysqlInstance.isRunning()) mysqlInstance.start("Em_MySQL", options, false, keys.contains("defaults-file")); } public String getPort() { return port; } /** * 判斷mysql是否正在運行 */ public boolean isRunning() { return null == mysqlInstance ? false : mysqlInstance.isRunning(); } public void shutdown() { if (mysqlInstance != null) mysqlInstance.shutdown(); } public void cleanup() { if (mysqlInstance != null) mysqlInstance.cleanup(); } }
下面這個是啟動Demo,
public static void main(String[] args) { try { Properties pro = new Properties(); //根據(jù)機(jī)器配置,設(shè)置不同的參數(shù) pro.load(MysqlTest.class.getResourceAsStream("MySql_medium.properties")); new EmbedMySqlServer(pro).startup(); //可以把數(shù)據(jù)庫放到其他磁盤 //new EmbedMySqlServer(pro,"f:\\").startup(); Connection conn = getTestConnection(); System.out.println(conn.isClosed()); conn.close(); } catch (Exception e) { e.printStackTrace(); } }
MySql_general.properties一般機(jī)器的配置樣例
MySql_medium.properties中等機(jī)器的配置樣例
MySql_large.properties高配機(jī)的配置樣例
具體的參數(shù)可以根據(jù)不同需求進(jìn)行定義,比如端口可以自由定義。
需要引用的mysql兩個jar,mysql-connector-mxj-gpl-6-0-11-db-files.jar,mysql-connector-mxj-gpl-6-0-11.jar
代碼在Git上,地址是:https://git.oschina.net/eliyanfei/api_tools.git

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