java+ mysql 给所有的表添加假数据

需求:别的项目, 代码扣过来了, 数据库也拿过来了, 但是数据库全是空表, 一共700 张表,需求是给表添加假数据,让它能运行起来。

一下是代码实现:

1.数据库连接:

    public static Connection getConnection(){
            Connection conn = null;
            try {
            Class.forName("com.mysql.jdbc.Driver");
            String url = "jdbc:mysql://192.168.0.12:3306/dmp_report_testdb?";
            String user = "root";
            String pass = "ycmedia_2015";
            conn = DriverManager.getConnection(url,user,pass);
            } catch (ClassNotFoundException e) {
            e.printStackTrace();
            } catch (SQLException e) {
            e.printStackTrace();
            }
            return conn;
            }

2.获取所有的表名:

 

     public static Set getTableName() throws SQLException{
               Connection conn=getConnection();
               DatabaseMetaData data = conn.getMetaData();
               ResultSet colRet = data.getColumns(null,"%", "%","%");
               
               Set set= new TreeSet();
                while(colRet.next()) {
                  String  typeName =colRet.getString("TABLE_NAME");
                  set.add(typeName);
                  }
                 return set;
             }

3.获取表的数据类型,mysql有几十种,常用大概十几种:

         * @return
         * @throws SQLException
         */
         public static Set getType() throws SQLException{
           Connection conn=getConnection();
           DatabaseMetaData data = conn.getMetaData();
           ResultSet colRet = data.getColumns(null,"%", "%","%");
           
           Set set= new TreeSet();
            while(colRet.next()) {
              String  typeName =colRet.getString("TYPE_NAME");
              set.add(typeName);
              }
             return set;
         }

 

 

4 分类:

        /**
             *  BIGINT
                BIGINT UNSIGNED(没有符号) 1-10
                INT
                INT UNSIGNED
                SMALLINT
                SMALLINT UNSIGNED
                TINYINT
                TINYINT UNSIGNED
                
                BIT  10
                
                DATE 最近一周
                
                DATETIME
                TIMESTAMP (最近一周)
                
                DECIMAL 11.11
                DOUBLE 11.11
                
                LONGTEXT
                MEDIUMTEXT
                TEXT
                VARCHAR

5 字符串类型处理

    //随机字符串
         public static String getRandomString(int length){
             String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
             Random random=new Random();
             StringBuffer sb=new StringBuffer();
             for(int i=0;i){
               int number=random.nextInt(62);
               sb.append(str.charAt(number));
             }
             return sb.toString();
         }

6.时间类型处理

         /**
          * 获取最近一个月随机一天
          * @return
          */
            public static String getMoth(Integer  type){
                
                Random r = new Random();
                
                SimpleDateFormat sdf = null;
                
                if(type==1){
                    sdf=new SimpleDateFormat("yyyy-MM-dd");
                    
                }else{
                    sdf=new SimpleDateFormat("yyyy-MM-dd 00:00:00");
                }
                Calendar c = Calendar.getInstance();
                c.add(Calendar.DATE, - r.nextInt(30));
                Date monday = c.getTime();
                return sdf.format(monday);

            }
        

7.获取sql

      /**
       * 获取sql
       * @param list
       * @param tableName
       * @return
       */
         public static String getSql(List list,String tableName){
             StringBuffer sb = new StringBuffer();
             Random random = new Random();
             sb.append("insert into  "+tableName +" values (");
             for (int i = 0; i < list.size(); i++) {
                 if(list.get(i).getColumnType().contains("INT")){
                        sb.append(random.nextInt(10)+", ");
                 }
                 else if(list.get(i).getColumnType().contains("CHAR")||list.get(i).getColumnType().contains("TEXT"))
                 {
                     sb.append("'"+getRandomString(5)+"', ");
                 }
                 else if(list.get(i).getColumnType().equals("BIT"))
                 {
                     sb.append("10, ");
                 }
                 else if(list.get(i).getColumnType().equals("DOUBLE")||list.get(i).getColumnType().equals("DECIMAL"))
                 {
                     sb.append("11.11, ");
                 }
                 else if(list.get(i).getColumnType().equals("DATETIME")||list.get(i).getColumnType().equals("TIMESTAMP"))
                 {
                     sb.append("'"+getMoth(2)+"', ");
                 }else if(list.get(i).getColumnType().equals("DATE")){
                     sb.append("'"+getMoth(1)+"', ");
                 }
                
             }
             return sb.toString().substring(0, sb.toString().length()-2)+")";
         }

8 .最后一步,主分支

        public static void main(String[] args) throws Exception{
            Connection conn=getConnection();
            Set set = getTableName();
            List list =new ArrayList();
            for (String str :set) {
                
                list =getColumnList(str);
            
                
                for (int i = 0; i < 20; i++) {
                    String sql =getSql(list,str);
                    System.err.println(sql);
                    try {
                        conn.prepareStatement(sql).execute();
                    } catch (Exception e) {
                        System.err.println("遇到异常");
                        continue;
                    }
                }
                list =new ArrayList();
                
            }
      }

 

=====================================================分割线=====================================================================

 

 

当然这种场景很少见吧, 大部分项目都不超过100 张表, 几十张最多了,实际开发中,而且这里的数据都是比较乱 的, 因为很多表都有关联, 只是大致插表, 当跑不通的部分就可以人为 修改那块了,比自己慢慢插数据好点

 

转载于:https://www.cnblogs.com/zgghb/p/5332291.html

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