项目中连接数据库的工具类
在项目有时会用到不同数据库,项目写了一个连接不同数据库(包括mysql,SQL server, oracle ,access)的工具类:
import java.io.File; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class ConnectionDbUtils { /** * 获取数据库连接对象(sql server) * * @param server * 服务器 * @param database * 数据库名 * @param user_id * 用户名 * @param password * 密码 * @return Connection * @throws ClassNotFoundException * @throws SQLException */ public static Connection getSqlServerConnection(String server, String database, String user_id, String password) throws ClassNotFoundException, SQLException { Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); Connection con = DriverManager.getConnection("jdbc:sqlserver://" + server + ":1433;DatabaseName=" + database, user_id, password); return con; } /** * 获取数据库连接对象(MySql) * * @param server * 服务器 * @param database * 数据库名 * @param user_id * 用户名 * @param password * 密码 * @return Connection * @throws ClassNotFoundException * @throws SQLException */ public static Connection getMySqlConnection(String server, String database, String user_id, String password) throws ClassNotFoundException, SQLException { Class.forName("com.mysql.jdbc.Driver"); return DriverManager.getConnection("jdbc:mysql://"+server+":3306/" + database, user_id, password); } /** * JDBC连接oracle * @param server IP * @param database 数据库 * @param user_id 用户名 * @param password 密码 * @param sql * @return * @throws ClassNotFoundException * @throws SQLException */ public static Connection getOracleConnection(String server, String database, String user_id, String password) throws ClassNotFoundException, SQLException { Class.forName("oracle.jdbc.driver.OracleDriver"); Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@" + server + ":1521:" + database, user_id, password); return conn; } /** * JDBC连接Access * @param database 数据库路径 * @param user_id 用户名 * @param password 密码 * @param sql * @return * @throws ClassNotFoundException * @throws SQLException * @throws IllegalAccessException * @throws InstantiationException */ public static Connection getAccessConnection(String database, String user_id, String password) throws ClassNotFoundException, SQLException, InstantiationException, IllegalAccessException { System.out.println("==============" + database); Class.forName("com.hxtt.sql.access.AccessDriver").newInstance(); Connection conn = DriverManager.getConnection("jdbc:Access:///" + database, user_id, password); System.out.println("连接成功"); return conn; } /** * Access 查询数据 * @param database * @param user_id * @param password * @param strSql * @return * @throws Exception */ public static List<Map<String, Object>> queryAccessData(String database, String user_id, String password, String strSql) throws Exception { File file = new File(database); if (file.exists()){ if (file.canWrite()) { System.out.println("不只读"); } else { System.out.println("只读"); file.setWritable(true); } } else { System.out.println("不存在"); } Connection con = ConnectionDbUtils.getAccessConnection(database, user_id, password); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(strSql); List<Map<String, Object>> listMap = new ArrayList<Map<String, Object>>(); while (rs.next()) { Map<String, Object> map = new HashMap<String, Object>(); ResultSetMetaData rsmd = rs.getMetaData(); for (int i = 1; i <= rsmd.getColumnCount(); i++) { String columnName = rsmd.getColumnName(i); Object objValue = rs.getObject(columnName); map.put(columnName, objValue); } listMap.add(map); } return listMap; } /** * Access增删改 * @param database * @param user_id * @param password * @param sql */ public static void createAccessSQLExecute(String database, String user_id, String password, String sql) { Statement stmt = null; try { Connection con = ConnectionDbUtils.getAccessConnection(database, user_id, password); stmt = con.createStatement(); int i = stmt.executeUpdate(sql); System.out.println("执行sql语句:" + sql); System.out.println("处理成功!处理条数为" + i); } catch (Exception e) { e.printStackTrace(); System.out.println("执行失败,请检查远程数据库是否打开服务"); } finally { try { if (null != stmt) { stmt.close(); } } catch (SQLException e) { e.printStackTrace(); } } } /** * oracle 查询数据 * @param server * @param database * @param user_id * @param password * @param strSql * @return * @throws Exception */ public static List<Map<String, Object>> queryOracleData(String server, String database, String user_id, String password, String strSql) throws Exception { Connection con = ConnectionDbUtils.getOracleConnection(server, database, user_id, password); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(strSql); List<Map<String, Object>> listMap = new ArrayList<Map<String, Object>>(); while (rs.next()) { Map<String, Object> map = new HashMap<String, Object>(); ResultSetMetaData rsmd = rs.getMetaData(); for (int i = 1; i <= rsmd.getColumnCount(); i++) { String columnName = rsmd.getColumnName(i); Object objValue = rs.getObject(columnName); map.put(columnName, objValue); } listMap.add(map); } return listMap; } /** * oracle增删改 * @param server * @param database * @param user_id * @param password * @param sql */ public static void createOracleSQLExecute(String server, String database, String user_id, String password, String sql) { Statement stmt = null; try { Connection con = ConnectionDbUtils.getOracleConnection(server, database, user_id, password); stmt = con.createStatement(); System.out.println("执行sql语句:" + sql); int i = stmt.executeUpdate(sql); System.out.println("处理成功!处理条数为" + i); } catch (Exception e) { e.printStackTrace(); System.out.println("执行失败,请检查远程数据库是否打开服务"); } finally { try { if (null != stmt) { stmt.close(); } } catch (SQLException e) { e.printStackTrace(); } } } /** * 查询数据(sql server) * * @param server 服务器 * @param database 数据库名 * @param user_id 用户名 * @param password 密码 * @param strSql sql语句 * @return List<Map<String,Object>> * @throws Exception */ public static List<Map<String, Object>> querySqlServerData(String server, String database, String user_id, String password, String strSql) throws Exception { Connection con = ConnectionDbUtils.getSqlServerConnection(server, database, user_id, password); Statement stmt = con.createStatement(); System.out.println("querySqlServerData的sql语句===========" + strSql); ResultSet rs = stmt.executeQuery(strSql); List<Map<String, Object>> listMap = new ArrayList<Map<String, Object>>(); while (rs.next()) { Map<String, Object> map = new HashMap<String, Object>(); ResultSetMetaData rsmd = rs.getMetaData(); for (int i = 1; i <= rsmd.getColumnCount(); i++) { String columnName = rsmd.getColumnName(i); Object objValue = rs.getObject(columnName); map.put(columnName, objValue); } listMap.add(map); } return listMap; } /** * 执行sql的添加、修改、删除操作 * * @param conn * @param sql */ public static void createSQLExecute(String server, String database, String user_id, String password, List<String> sql) { Statement stmt = null; try { Connection con = ConnectionDbUtils.getSqlServerConnection(server, database, user_id, password); stmt = con.createStatement(); for (String s : sql) { System.out.println("执行sql语句:" + sql); int i = stmt.executeUpdate(s); System.out.println("处理成功!处理条数为" + i); } } catch (Exception e) { e.printStackTrace(); System.out.println("执行失败,请检查远程数据库是否打开服务"); } finally { try { if (null != stmt) { stmt.close(); } } catch (SQLException e) { e.printStackTrace(); } } } /** * 执行sql的添加、修改、删除操作 * * @param conn * @param sql */ public static void createSQLExecute(String server, String database, String user_id, String password, String sql) { Statement stmt = null; try { System.out.println("执行sql语句:" + sql); Connection con = ConnectionDbUtils.getSqlServerConnection(server, database, user_id, password); stmt = con.createStatement(); int i = stmt.executeUpdate(sql); System.out.println("处理成功!处理条数为" + i); } catch (Exception e) { e.printStackTrace(); System.out.println("执行失败,请检查远程数据库是否打开服务"); } finally { try { if (null != stmt) { stmt.close(); } } catch (SQLException e) { e.printStackTrace(); } } } /** * MySql 查询数据 * @param server * @param database * @param user_id * @param password * @param strSql * @return * @throws Exception */ public static List<Map<String, Object>> queryMySqlData(String server, String database, String user_id, String password, String sql) throws Exception { Connection con = ConnectionDbUtils.getMySqlConnection(server, database, user_id, password); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(sql); List<Map<String, Object>> listMap = new ArrayList<Map<String, Object>>(); while (rs.next()) { Map<String, Object> map = new HashMap<String, Object>(); ResultSetMetaData rsmd = rs.getMetaData(); for (int i = 1; i <= rsmd.getColumnCount(); i++) { String columnName = rsmd.getColumnName(i); Object objValue = rs.getObject(columnName); map.put(columnName, objValue); } listMap.add(map); } return listMap; } /** * 执行MySql的增删改 * @param server * @param database * @param user_id * @param password * @param sql */ public static void createMySqlExecute(String server,String database,String user_id,String password,String sql){ Connection con=null; Statement stmt = null; try { System.out.println("执行sql语句:" + sql); con= ConnectionDbUtils.getMySqlConnection(server, database, user_id, password); stmt = con.createStatement(); int successCount = stmt.executeUpdate(sql); System.out.println("处理成功!处理条数为" + successCount); } catch (Exception e) { e.printStackTrace(); System.out.println("执行失败,请检查远程数据库是否打开服务"); } finally { try { if (null != stmt) { stmt.close(); } } catch (SQLException e) { e.printStackTrace(); } } } }
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