package com.mescs.baseinfo.utils;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/**
 * 
 * 類名：DatabaseUtil  <br />
 *
 * 功能：數據庫操作
 *
 */
 public class DatabaseUtil {    
    private final static Logger LOGGER = LoggerFactory.getLogger(DatabaseUtil.class);    
    private static final String DRIVER = "org.firebirdsql.jdbc.FBDriver";    
    private static final String URL = "jdbc:firebirdsql:embedded:mescs.fdb?lc_ctype=UTF8";    
    private static final String USERNAME = "root";    
    private static final String PASSWORD = "root";    
    private static final String SQL = "DELETE FROM ";// 數據庫數據庫表內容清空
    
    static {        try {
            Class.forName(DRIVER);
        } catch (ClassNotFoundException e) {
            LOGGER.error("數據庫驅動加載失敗===>>>", e);
        }
    }    /**
     * 獲取數據庫連接
     *
     * @return     */
    public static Connection getConnection() {
        Connection conn = null;        
        try {
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (SQLException e) {
            LOGGER.error("數據庫連接失敗===>>>", e);
        }        return conn;
    }    /**
     * 關閉數據庫連接
     * @param conn     */
    public static void closeConnection(Connection conn) {        
       if(conn != null) {            
            try {
                conn.close();
            } catch (SQLException e) {
                LOGGER.error("數據庫關閉失敗===>>>", e);
            }
        }
    }    /**
     * 獲取數據庫下的所有表名     */
    public static List<String> getTableNames() {
        List<String> tableNames = new ArrayList<String>();
        Connection conn = getConnection();
        ResultSet rs = null;        
        try {       //獲取數據庫的元數據
            DatabaseMetaData db = conn.getMetaData();  //從元數據中獲取到所有的表名
            rs = db.getTables(null, null, null, new String[] { "TABLE" });            
            while(rs.next()) {
                tableNames.add(rs.getString(3));
            }
        } catch (SQLException e) {
            LOGGER.error("獲取數據庫表名失敗===>>>", e);
        } finally {            try {
                rs.close();
                closeConnection(conn);
            } catch (SQLException e) {
                LOGGER.error("關閉數據庫失敗===>>>", e);
            }
        }        return tableNames;
    }    /*
     * 清空數據庫表     */
    public static void emptyDatabase() throws SQLException {
        List<String> tableNames = getTableNames();
        Connection conn = getConnection();
        PreparedStatement pStemt = null;        
        for(String table:tableNames){            
             if(!table.equals("SYSPARAM") && !table.equals("T_CLEAR_DATA")){
                String tableSql = SQL + table;                
                try {
                    pStemt = conn.prepareStatement(tableSql);
                    Statement stmt=conn.createStatement();
                    stmt.executeUpdate(tableSql);
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
        conn.close();
    }
}

總結：這里的數據庫用的Firebird數據庫，當然可以用Mysql，Oracle等主流數據庫，方法也只是簡單列出了刪除，增刪改查類似，如法炮制。

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