Question

我在每年年底有12个表转移到新数据库。（db2012，db2013等）通过以下过程，我从旧数据库中获取模式并将其创建为新模式。但是当在每个模式的末尾创建新表时，有一行AUTO_INCREMENT =自动增量值的oldlastvalue。

如何获得1

1）我必须在传输数据之前对每个表进行TRUNCATE

2）编写一个在sql文件中更改此编号的过程。

3）？希望在从旧数据库中读取时将其设为1

有解决方案吗？

private void CopySchemas(string pathname)
    {
        string [] MyArray = new string[12];
        int index = 0;
        using (MySqlConnection conn = new MySqlConnection(PublicVariables.cs))
        {
            using(MySqlCommand cmd = new MySqlCommand("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE' AND TABLE_SCHEMA='" + PublicVariables.DbName+"'",conn))
                {
                    conn.Open();
                    MySqlDataReader reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        MyArray[index] = reader.GetValue(0).ToString();   // getting only the name of the table for creating my filename.sql
                        ++index;
                    }
                    reader.Dispose();
                }
            for (int i = 0; i < MyArray.Length; ++i)
            {
                string tblname = MyArray[i];
                string fname = pathname  +"\\" + tblname + ".sql";
                MySqlCommand cmd = new MySqlCommand("SHOW CREATE TABLE " + PublicVariables.DbName + "." + tblname, conn);
                MySqlDataReader reader = cmd.ExecuteReader();
                while (reader.Read())
                {
                    for (int a = 0; a < reader.FieldCount; ++a)
                       string Schemas = reader.GetValue(a).ToString();
                    File.WriteAllText(fname,Schemas );
                }
                reader.Dispose();
            }
        }
    }

Answer 1

对于MySQL，命令是：

ALTER TABLE tablename AUTO_INCREMENT = 0

获取模式时如何将自动增量设置为1

1 个答案: