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  • MySql CP 表 和 数据

            /// <summary>
            /// copy 表和数据
            /// </summary>
            /// <param name="newDbName">新数据库</param>
            /// <param name="oldDbName">旧数据库</param>
            /// <param name="tableName">表名</param>
            /// <param name="connStr">连接字符串</param>
            public void Copy(string newDbName, string oldDbName, string tableName, string connStr)
            {
                string constr = connStr;
                string tableSql = $"create table if not exists {newDbName}.{tableName} like {oldDbName}.{tableName}";
                string strSql = $"insert  {newDbName}.{tableName} select * from  {oldDbName}.{tableName}";
                using (MySqlConnection mycon = new MySqlConnection(constr))
                {
                    mycon.Open();
                    //这里加了if not exists(SQL语法很重要)
                    using (MySqlCommand mycmd = new MySqlCommand(tableSql, mycon))
                    {
                        object count = mycmd.ExecuteScalar();
                    };
    
                    //表结构有了,开始插入数据
                    using (MySqlCommand mycmd2 = new MySqlCommand(strSql, mycon))
                    {
                        mycmd2.ExecuteNonQuery();//这一句或者上面那句都可以执行command
                    }
                }
    
            }

    MySql查询数据库所有表

    select table_name from information_schema.tables where table_schema='数据库名称';
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  • 原文地址:https://www.cnblogs.com/ly1998/p/14101234.html
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