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封装了增删改查功能
适用于MySQL、Oracle、SQLServer、DB2、Sybase、JTDS、PostgreSql、SQLite、Derby、H2、HSQLDB、ODBC 等等数据库，有需要的还可以自己增加。
package com.tgb.hz.jdbc;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import java.io.IOException;
import java.sql.*;
import java.util.Properties;/*** 数据访问基类<br>* <strong>支持 MySQL、Oracle、SQLServer、DB2、Sybase、PostgreSql、SQLite、Derby、H2、HSQLDB、ODBC、SQLServer_JTDS、Sybase_JTDS</strong>* <br>切换数据库时，需要指定相关参数* * @author hezhao* @Time 2017年7月27日 下午4:22:23* @Description 无* @Version V 1.0*/
public class BaseDao {private final Logger logger = LoggerFactory.getLogger(BaseDao.class);private final boolean isLog = false;//是否记录SQL日志private final boolean isConfig = false;//是否需要配置文件private final boolean isDataSource = false;//是否从连接池取连接private final String datasource = "";//如果是从连接池取连接，那么给出连接名称private final DBType type = DBType.MySQL;//数据库类型// 数据库名private final String db = "dbname";private final String ip = "127.0.0.1";private String name = "root";private String pwd = "root";private String driver;private String url;private Connection conn = null;private PreparedStatement pstmt = null;protected ResultSet rs = null;{//把JDBC配置信息放在配置文件中if(isConfig){final Properties properties = new Properties();try {properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("jdbc.properties"));} catch (final IOException e) {logger.error("加载JDBC配置信息失败...");logger.error(e.toString(),e);}driver = properties.getProperty("jdbc.driver");url = properties.getProperty("jdbc.url");name = properties.getProperty("jdbc.username");pwd = properties.getProperty("jdbc.password");}else{if(type == DBType.MySQL){driver = "com.mysql.jdbc.Driver"; url = "jdbc:mysql://"+ip+":3306/"+db+"?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull";}else if(type == DBType.SQLServer){//1、使用sqljdbcdriver = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; url = "jdbc:sqlserver://"+ip+":1433;DatabaseName="+db;}else if(type == DBType.SQLServer_JTDS){//2、使用jtdsdriver = "net.sourceforge.jtds.jdbc.Driver"; url = "jdbc:jtds:sqlserver://"+ip+":1433;DatabaseName="+db;}else if(type == DBType.Oracle){driver = "oracle.jdbc.driver.OracleDriver"; url = "jdbc:oracle:thin:@"+ip+":1521:"+db;}else if(type == DBType.DB2){driver = "com.ibm.db2.jcc.DB2Driver"; url = "jdbc:db2://"+ip+":50000/"+db;}else if(type == DBType.Sybase){driver = "com.sybase.jdbc.SybDriver"; url = "jdbc:sybase:Tds:"+ip+":5007/"+db;}else if(type == DBType.Sybase_JTDS){driver = "net.sourceforge.jtds.jdbc.Driver"; url = "jdbc:jtds:sybase://"+ip+":5007/"+db;}else if(type == DBType.PostgreSql){driver = "org.postgresql.Driver"; url = "jdbc:postgresql://"+ip+"/"+db;}else if(type == DBType.SQLite){driver = "org.sqlite.JDBC"; url = "jdbc:sqlite:"+db; //jdbc:sqlite:person.db}else if(type == DBType.H2){driver = "org.h2.Driver"; url = "jdbc:h2:tcp://"+ip+"/~/"+db;}else if(type == DBType.HSQLDB){driver = "org.hsqldb.jdbcDriver"; url = "jdbc:hsqldb:hsql://"+ip+":9001/"+db;}else if(type == DBType.Derby){driver = "org.apache.derby.jdbc.ClientDriver"; url = "jdbc:derby://"+ip+":1527/"+db+";";}else if(type == DBType.ODBC){driver = "sun.jdbc.odbc.JdbcOdbcDriver"; url = "jdbc:odbc:"+db;}}}private void getConnection() {if(!isDataSource){//1、通过JDBC获得链接try {Class.forName(driver);conn = DriverManager.getConnection(url, name, pwd);} catch (Exception e) {logger.error(e.toString(),e);}}else{//2、通过数据连接池获得链接try {Context ctx = new InitialContext();DataSource ds = (DataSource)ctx.lookup(datasource);this.conn = ds.getConnection();} catch (NamingException e) {logger.error(e.toString(),e);} catch (SQLException e) {logger.error(e.toString(),e);}}}/*** 关闭资源*/protected void closeAll() {try {if (this.rs != null) {rs.close();}if (this.pstmt != null) {pstmt.close();}if (this.conn != null) {conn.close();}} catch (SQLException e) {logger.error(e.toString(),e);}}/*** 增删改通用* @author hezhao* @Time 2017年7月27日 下午4:22:09* @Description 无* @Version V 1.0* @param sql* @param prams* @return*/protected int executeUpdate(String sql, Object... prams) {try {this.getConnection();this.pstmt = conn.prepareStatement(sql);if (prams != null) {for (int i = 0; i < prams.length; i++) {this.pstmt.setObject(i + 1, prams[i]);}}log(sql, prams);return this.pstmt.executeUpdate();} catch (SQLException e) {logger.error(e.toString(),e);} finally {closeAll();}return 0;}/*** 新增，返回主键* @author hezhao* @Time 2017年1月18日 下午2:23:07* @param sql* @param prams* @return*/protected int executeInsert(String sql, Object... prams) {try {this.getConnection();//传入参数：STATEMENT.RETURN_GENERATED_KEYS，指定返回生成的主键 this.pstmt = conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);if (prams != null) {for (int i = 0; i < prams.length; i++) {this.pstmt.setObject(i + 1, prams[i]);}}log(sql, prams);//执行sqlint count = this.pstmt.executeUpdate();//返回的主键int autoIncKey = 0;if(count > 0){ResultSet rs = pstmt.getGeneratedKeys(); //获取结果if (rs.next()) {autoIncKey = rs.getInt(1);//取得ID} else {// throw an exception from herelogger.error("插入语句出错，没有获取到新增的ID！");}}return autoIncKey;} catch (SQLException e) {logger.error(e.toString(),e);} finally {closeAll();}return 0;}/*** 查询通用* @author hezhao* @Time 2017年7月27日 下午4:22:45* @Description 无* @Version V 1.0* @param sql* @param prams*/protected void executeQuery(String sql, Object... prams) {try {this.getConnection();this.pstmt = conn.prepareStatement(sql);if (prams != null) {for (int i = 0; i < prams.length; i++) {this.pstmt.setObject(i + 1, prams[i]);}}log(sql, prams);this.rs = this.pstmt.executeQuery();} catch (SQLException e) {logger.error(e.toString(),e);}}/*** 打印日志* @author hezhao* @Time 2017年7月27日 下午4:22:56* @Description 无* @Version V 1.0* @param sql* @param prams*/private void log(String sql, Object[] prams) {if(isLog) {System.out.println("===========" + sql);if (prams != null && prams.length > 0) {System.out.println("参数：");for (int i = 0; i < prams.length; i++) {if (i == prams.length - 1) {System.out.print(prams[i] + "\n");} else {System.out.print(prams[i] + ",");}}}}}/*** 数据库类型* @author hezhao on 2017年7月27日 上午11:26:08**/static enum DBType{MySQL,Oracle,SQLServer, //SQLServer2005SQLServer_JTDS, //使用jtds连接SQLServerDB2,Sybase,Sybase_JTDS, //使用jtds连接SybasePostgreSql,SQLite,Derby,H2,HSQLDB,ODBC; //桥连接} }
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