c# - 通过DataTable以编程方式创建SQL Server CE表

有谁知道在运行时基于DataTable的架构创建SQL Server CE（Compact 3.5）表的最佳方法？我不想不必根据所有可能的数据类型来制定CREATE TABLE语句，等等。

另外，您是否知道如何直接从数据表中填充数据？

最佳答案

我已经使用并更新了本·布雷恩（Ben Breen）的代码：


更改了GetSqlServerCETypeName以使用所有类型
添加了一个函数来处理整个数据集
和一些小的调整


GetSqlDBTypeFromType

/// <summary>
    /// Gets the correct SqlDBType for a given .NET type. Useful for working with SQL CE.
    /// </summary>
    /// <param name="type">The .Net Type used to find the SqlDBType.</param>
    /// <returns>The correct SqlDbType for the .Net type passed in.</returns>
    public static SqlDbType GetSqlDBTypeFromType(Type type)
    {
        TypeConverter tc = TypeDescriptor.GetConverter(typeof(DbType));
        if (/*tc.CanConvertFrom(type)*/ true)
        {
            DbType dbType = (DbType)tc.ConvertFrom(type.Name);
            // A cheat, but the parameter class knows how to map between DbType and SqlDBType.
            SqlCeParameter param = new SqlCeParameter();
            param.DbType = dbType;
            return param.SqlDbType; // The parameter class did the conversion for us!!
        }
        else
        {
            throw new Exception("Cannot get SqlDbType from: " + type.Name);
        }
    }

GetSqlServerCETypeName

/// <summary>
    /// The method gets the SQL CE type name for use in SQL Statements such as CREATE TABLE
    /// </summary>
    /// <param name="dbType">The SqlDbType to get the type name for</param>
    /// <param name="size">The size where applicable e.g. to create a nchar(n) type where n is the size passed in.</param>
    /// <returns>The SQL CE compatible type for use in SQL Statements</returns>
    public static string GetSqlServerCETypeName(SqlDbType dbType, int size)
    {
        // Conversions according to: http://msdn.microsoft.com/en-us/library/ms173018.aspx
        bool max = (size == int.MaxValue) ? true : false;
        bool over4k = (size > 4000) ? true : false;

        if (size>0)
        {
            return string.Format(Enum.GetName(typeof(SqlDbType), dbType)+" ({0})", size);
        }
        else
        {
            return Enum.GetName(typeof(SqlDbType), dbType);
        }
    }

GetCreateTableStatement

/// <summary>
    /// Genenerates a SQL CE compatible CREATE TABLE statement based on a schema obtained from
    /// a SqlDataReader or a SqlCeDataReader.
    /// </summary>
    /// <param name="tableName">The name of the table to be created.</param>
    /// <param name="schema">The schema returned from reader.GetSchemaTable().</param>
    /// <returns>The CREATE TABLE... Statement for the given schema.</returns>
    public static string GetCreateTableStatement(DataTable table)
    {
        StringBuilder builder = new StringBuilder();
        builder.Append(string.Format("CREATE TABLE [{0}] (", table.TableName));

        foreach (DataColumn col in table.Columns)
        {
            SqlDbType dbType = GetSqlDBTypeFromType(col.DataType);
            builder.Append("[");
            builder.Append(col.ColumnName);
            builder.Append("]");
            builder.Append(" ");
            builder.Append(GetSqlServerCETypeName(dbType, col.MaxLength));
            builder.Append(", ");
        }

        if (table.Columns.Count > 0) builder.Length = builder.Length - 2;

        builder.Append(")");
        return builder.ToString();
    }

CreateFromDataset

public static void CreateFromDataset(DataSet set, SqlCeConnection conn)
    {
        conn.Open();
        SqlCeCommand cmd;
        foreach (DataTable table in set.Tables)
        {
            string createSql = copyDB.GetCreateTableStatement(table);
            Console.WriteLine(createSql);

            cmd = new SqlCeCommand(createSql, conn);
            Console.WriteLine(cmd.ExecuteNonQuery());
        }
        conn.Close();
    }

}

关于c# - 通过DataTable以编程方式创建SQL Server CE表，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/1104082/