一个简单的JDBC通用工具

一个简单的JDBC通用工具

 

支持多种数据库，统一方式产生连接，最优化、最简单方式释放资源。

 

欢迎拍砖！

 

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();
        }
}

本文出自 “熔 岩” 博客，谢绝转载！