使用Java编写控制JDBC连接、执行及关闭的工具类

   /**    * 关闭所有可关闭资源    *    * @param objs 可关闭的资源对象有Connection、Statement、ResultSet，别的类型资源自动忽略    */   public static void closeAll(Object... objs) {     for (Object obj : objs) {       if (obj instanceof Connection) close((Connection) obj);       if (obj instanceof Statement) close((Statement) obj);       if (obj instanceof ResultSet) close((ResultSet) obj);     }   } 

catch (SQLException e) {       e.printStackTrace();     } finally {       DBTools.closeAll(stmt, pstmt1, pstmt2, conn);     }

package com.lavasoft.ibatistools.common; import com.lavasoft.ibatistools.bean.Table; import com.lavasoft.ibatistools.metadata.DataSourceMetaData; import com.lavasoft.ibatistools.metadata.MySQLDataSourceMetaData; import java.io.IOException; import java.io.InputStream; import java.sql.*; import java.util.List; import java.util.Properties; /** * 简单的Java数据库连接和关闭工具类 * * @author leizhimin 11-12-20 下午4:32 */ public class DBTools {   private static String driverClassName, url, user, password;   static {     init();   }   private static void init() {     InputStream in = DBTools.class.getResourceAsStream("/com/lavasoft/ibatistools/jdbc.properties");     Properties preps = new Properties();     try {       preps.load(in);       driverClassName = preps.getProperty("jdbc.driver");       url = preps.getProperty("jdbc.url");       user = preps.getProperty("jdbc.username");       password = preps.getProperty("jdbc.password");     } catch (IOException e) {       e.printStackTrace();     }   }   /**    * 创建一个JDBC连接    *    * @return 一个JDBC连接    */   public static Connection makeConnection() {     Connection conn = null;     try {       Class.forName(driverClassName);       conn = DriverManager.getConnection(url, user, password);     } catch (ClassNotFoundException e) {       e.printStackTrace();     } catch (SQLException e) {       e.printStackTrace();     }     return conn;   }   public static void close(Connection conn) {     if (conn != null)       try {         conn.close();       } catch (SQLException e) {         e.printStackTrace();       }   }   public static void close(ResultSet rs) {     if (rs != null)       try {         rs.close();       } catch (SQLException e) {         e.printStackTrace();       }   }   public static void close(Statement stmt) {     if (stmt != null)       try {         stmt.close();       } catch (SQLException e) {         e.printStackTrace();       }   }   /**    * 关闭所有可关闭资源    *    * @param objs 可关闭的资源对象有Connection、Statement、ResultSet，别的类型资源自动忽略    */   public static void closeAll(Object... objs) {     for (Object obj : objs) {       if (obj instanceof Connection) close((Connection) obj);       if (obj instanceof Statement) close((Statement) obj);       if (obj instanceof ResultSet) close((ResultSet) obj);     }   }   public static void main(String[] args) {     DataSourceMetaData dbmd = MySQLDataSourceMetaData.instatnce();     List<Table> tableList = dbmd.getAllTableMetaData(DBTools.makeConnection());     for (Table table : tableList) {       System.out.println(table);     }   } }

import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.sql.*; import java.util.List; import java.util.Properties; /** * 通用数据库操作工具，提供数据库连接获取、SQL执行、资源关闭等功能，支持的数据库为Oracle10g、MySQL5.x。</P> * * @author leizhimin 2012-03-05 11:22 */ public class DBToolkit {   private static Log log = LogFactory.getLog(DBToolkit.class);   static {     try {       Class.forName("oracle.jdbc.driver.OracleDriver");       Class.forName("com.mysql.jdbc.Driver");     } catch (ClassNotFoundException e) {       log.error("加载数据库驱动发生错误！");       e.printStackTrace();     }   }   /**    * 创建一个数据库连接    *    * @param url    数据库连接URL串    * @param properties 作为连接参数的任意字符串标记/值对的列表；通常至少应该包括 "user" 和 "password" 属性    * @return 一个JDBC的数据库连接    * @throws SQLException 获取连接失败时候抛出    */   public static Connection makeConnection(String url, Properties properties) throws SQLException {     Connection conn = null;     try {       conn = DriverManager.getConnection(url, properties);     } catch (SQLException e) {       log.error("获取数据库连接发生异常", e);       throw e;     }     return conn;   }   /**    * 在一个数据库连接上执行一个静态SQL语句查询    *    * @param conn   数据库连接    * @param staticSql 静态SQL语句字符串    * @return 返回查询结果集ResultSet对象    * @throws SQLException 执行异常时候抛出    */   public static ResultSet executeQuery(Connection conn, String staticSql) throws SQLException {     ResultSet rs = null;     try {       //创建执行SQL的对象       Statement stmt = conn.createStatement();       //执行SQL，并获取返回结果       rs = stmt.executeQuery(staticSql);     } catch (SQLException e) {       log.error("执行SQL语句出错，请检查！/n" + staticSql);       throw e;     }     return rs;   }   /**    * 在一个数据库连接上执行一个静态SQL语句    *    * @param conn   数据库连接    * @param staticSql 静态SQL语句字符串    * @throws SQLException 执行异常时候抛出    */   public static void executeSQL(Connection conn, String staticSql) throws SQLException {     Statement stmt = null;     try {       //创建执行SQL的对象       stmt = conn.createStatement();       //执行SQL，并获取返回结果       stmt.execute(staticSql);     } catch (SQLException e) {       log.error("执行SQL语句出错，请检查！/n" + staticSql);       throw e;     } finally {       close(stmt);     }   }   /**    * 在一个数据库连接上执行一批静态SQL语句    *    * @param conn  数据库连接    * @param sqlList 静态SQL语句字符串集合    * @throws SQLException 执行异常时候抛出    */   public static void executeBatchSQL(Connection conn, List<String> sqlList) throws SQLException {     try {       //创建执行SQL的对象       Statement stmt = conn.createStatement();       for (String sql : sqlList) {         stmt.addBatch(sql);       }       //执行SQL，并获取返回结果       stmt.executeBatch();     } catch (SQLException e) {       log.error("执行批量SQL语句出错，请检查！");       throw e;     }   }   /**    * 获取Oracle数据一个指定的Sequence下一个值    *    * @param conn   数据库连接    * @param seq_name Sequence名称    * @return Sequence下一个值    */   public static long sequenceNextval(Connection conn, String seq_name) {     long val = -1L;     Statement stmt = null;     ResultSet rs = null;     try {       //创建执行SQL的对象       stmt = conn.createStatement();       //执行SQL，并获取返回结果       rs = stmt.executeQuery("select " + seq_name + ".nextval from dual");       if (rs.next()) val = rs.getLong(1);     } catch (SQLException e) {       log.error("#ERROR# :获取Sequence值出错，请检查！/n" + seq_name);       e.printStackTrace();       throw new RuntimeException(e);     } finally {       close(rs);       close(stmt);     }     return val;   }   /**    * 关闭所有可关闭的JDBC资源，不论先后顺序，总能以正确的顺序执行    *    * @param objs 可关闭的资源对象有Connection、Statement、ResultSet，别的类型资源自动忽略    */   public static void closeAll(Object... objs) {     for (Object obj : objs)       if (obj instanceof ResultSet) close((ResultSet) obj);     for (Object obj : objs)       if (obj instanceof Statement) close((Statement) obj);     for (Object obj : objs)       if (obj instanceof Connection) close((Connection) obj);   }   private static void close(Connection conn) {     if (conn != null)       try {         conn.close();       } catch (SQLException e) {         log.error("关闭数据库连接发生异常！");       }   }   private static void close(ResultSet rs) {     if (rs != null)       try {         rs.close();       } catch (SQLException e) {         log.error("关闭结果集发生异常！");       }   }   private static void close(Statement stmt) {     if (stmt != null)       try {         stmt.close();       } catch (SQLException e) {         log.error("关闭SQL语句发生异常！");       }   }   /**    * 测试代码，没用    *    * @param args    * @throws SQLException    */   public static void main(String[] args) throws SQLException {     String tns = "jdbc:oracle:thin:@/n" +         "(description= /n" +         "/t(ADDRESS_LIST =/n" +         "/t/t(address=(protocol=tcp)(host=10.87.30.44)(port=1521))/n" +         "/t/t(address=(protocol=tcp)(host=10.87.30.45)(port=1521))/n" +         "/t/t(address=(protocol=tcp)(host=10.87.30.46)(port=1521))/n" +         "/t/t(load_balance=yes)/n" +         "/t)/n" +         "/t(connect_data =/n" +         "/t/t(service_name=KFCS)/n" +         "/t/t(failover_mode =/n" +         "/t/t/t(type=session)/n" +         "/t/t/t(method=basic)/n" +         "/t/t/t(retries=5)/n" +         "/t/t/t(delay=15)/n" +         "/t/t)/n" +         "/t)/n" +         ")";     Properties p_ora = new Properties();     p_ora.put("user", "base");     p_ora.put("password", "1qaz!QAZ");     p_ora.put("internal_logon", "normal");     Connection ora_conn = makeConnection(tns, p_ora);     ResultSet rs1 = ora_conn.createStatement().executeQuery("select count(1) from base.cfg_static_data");     rs1.next();     System.out.println(rs1.getInt(1));     rs1.close();     ora_conn.close();     Properties p_mysql = new Properties();     p_mysql.put("user", "root");     p_mysql.put("password", "leizm");     String url = "jdbc:mysql://localhost:3306/tdmc";     Connection mysql_conn = makeConnection(url, p_mysql);     ResultSet rs2 = mysql_conn.createStatement().executeQuery("select count(1) from cfg_code");     rs2.next();     System.out.println(rs2.getInt(1));     rs2.close();     mysql_conn.close();   } }