使用实体框架将数据表转换为SQL Server表

Question

我有一个包含多个表和数据集中的关系的数据集。 我希望能够使用实体框架将我的数据集表转换为SQL Server表集。 我看到了有关填充表格的文章-但从字面上看，我将如何处理这样的伪代码。

for each dataTable in ds.Tables
{
    Create a table in SQL Server with these columns
}

创建后，我想添加关系..然后填充数据。

我通过读取xml文件在数据集中获得这些表，我具有xsd.exe创建的类

Answer 1

我不能说我完全按照提出的答案回答问题，因为似乎没有实体框架可以解决该问题。 但是，我发布此答案的主要目的是，如果其他人正在寻找代码来转换数据集，其表和关系，然后在SQLServer中创建它们。 下面的代码使用SQLClient的标准.NET库。 不使用SMO。

大部分代码不是我的，而是来自用户：010110110101， 将DataTable转换为C＃中的SQL的CREATE TABLE + INSERT脚本

我对代码的主要贡献是修复了代码中的一些小错误，还添加了Alter Table sql以及生成Relations的方法。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace Helpers.Sql
{

    public class TableCreator
    {
        #region Instance Variables
        private SqlConnection _connection;
        public SqlConnection Connection
        {
            get { return _connection; }
            set { _connection = value; }
        }

        private SqlTransaction _transaction;
        public SqlTransaction Transaction
        {
            get { return _transaction; }
            set { _transaction = value; }
        }

        private string _tableName;
        public string DestinationTableName
        {
            get { return _tableName; }
            set { _tableName = value; }
        }
        #endregion

        #region Constructor
        public TableCreator() { }
        public TableCreator(SqlConnection connection) : this(connection, null) { }
        public TableCreator(SqlConnection connection, SqlTransaction transaction)
        {
            _connection = connection;
            _transaction = transaction;
        }

        public TableCreator(string connectionString)
        {

            this.Connection = new SqlConnection(connectionString);

        }


        #endregion

        #region Instance Methods
        public object Create(DataTable schema)
        {
            return Create(schema, null);
        }
        public object Create(DataTable schema, int numKeys)
        {
            int[] primaryKeys = new int[numKeys];
            for (int i = 0; i < numKeys; i++)
            {
                primaryKeys[i] = i;
            }
            return Create(schema, primaryKeys);
        }
        public object Create(DataTable schema, int[] primaryKeys)
        {
            string sql = GetCreateSQL(_tableName, schema, primaryKeys);

            SqlCommand cmd;
            if (_transaction != null && _transaction.Connection != null)
                cmd = new SqlCommand(sql, _connection, _transaction);
            else
                cmd = new SqlCommand(sql, _connection);

            return cmd.ExecuteNonQuery();
        }

        public object CreateFromDataTable(DataTable table)
        {
            DestinationTableName = table.TableName;

            string sql = GetCreateFromDataTableSQL(_tableName, table);

            SqlCommand cmd;
            if (_transaction != null && _transaction.Connection != null)
                cmd = new SqlCommand(sql, _connection, _transaction);
            else
                cmd = new SqlCommand(sql, _connection);

            return cmd.ExecuteNonQuery();
        }


        /// <summary>
        /// Creates a Data Relation
        /// </summary>
        /// <param name="_relation"></param>
        /// <returns></returns>
        public object CreateRelationFromDataSet(DataRelation _relation)
        {

            string sql = GetCreateFromDatSetRelations(_relation);

            SqlCommand cmd;
            if (_transaction != null && _transaction.Connection != null)
                cmd = new SqlCommand(sql, _connection, _transaction);
            else
                cmd = new SqlCommand(sql, _connection);

            return cmd.ExecuteNonQuery();

        }


        #endregion

        #region Static Methods

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tableName"></param>
        /// <param name="schema"></param>
        /// <param name="primaryKeys"></param>
        /// <returns></returns>
        public static string GetCreateSQL(string tableName, DataTable schema, int[] primaryKeys)
        {
            string sql = "CREATE TABLE [" + tableName + "] (\n";

            // columns
            foreach (DataRow column in schema.Rows)
            {
                if (!(schema.Columns.Contains("IsHidden") && (bool)column["IsHidden"]))
                {
                    sql += "\t[" + column["ColumnName"].ToString() + "] " + SQLGetType(column);

                    if (schema.Columns.Contains("AllowDBNull") && (bool)column["AllowDBNull"] == false)
                        sql += " NOT NULL";

                    sql += ",\n";
                }
            }
            sql = sql.TrimEnd(new char[] { ',', '\n' }) + "\n";

            // primary keys
            string pk = ", CONSTRAINT PK_" + tableName + " PRIMARY KEY CLUSTERED (";
            bool hasKeys = (primaryKeys != null && primaryKeys.Length > 0);
            if (hasKeys)
            {
                // user defined keys
                foreach (int key in primaryKeys)
                {
                    pk += schema.Rows[key]["ColumnName"].ToString() + ", ";
                }
            }
            else
            {
                // check schema for keys
                string keys = string.Join(", ", GetPrimaryKeys(schema));
                pk += keys;
                hasKeys = keys.Length > 0;
            }
            pk = pk.TrimEnd(new char[] { ',', ' ', '\n' }) + ")\n";
            if (hasKeys) sql += pk;

            sql += ")";

            return sql;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tableName"></param>
        /// <param name="table"></param>
        /// <returns></returns>
        public static string GetCreateFromDataTableSQL(string tableName, DataTable table)
        {
            string sql = "CREATE TABLE [" + tableName + "] (\n";
            // columns
            foreach (DataColumn column in table.Columns)
            {
                sql += "[" + column.ColumnName + "] " + SQLGetType(column) + ",\n";
            }
            sql = sql.TrimEnd(new char[] { ',', '\n' }) + "\n";
            // primary keys
            if (table.PrimaryKey.Length > 0)
            {
                sql += "CONSTRAINT [PK_" + tableName + "] PRIMARY KEY CLUSTERED (";
                foreach (DataColumn column in table.PrimaryKey)
                {
                    sql += "[" + column.ColumnName + "],";
                }
                sql = sql.TrimEnd(new char[] { ',' }) + "))\n";
            }

            //if not ends with ")"
            if ((table.PrimaryKey.Length == 0) && (!sql.EndsWith(")")))
            {
                sql += ")";
            }

            return sql;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="relation"></param>
        /// <returns></returns>
        public static string GetCreateFromDatSetRelations(DataRelation relation)
        {

            // string sql = "";

            string childTableName = relation.ChildTable.TableName;
            string parentTableName = relation.ParentTable.TableName;

            string sql = "ALTER TABLE [" + childTableName + "] ADD CONSTRAINT \n";

            //sql += "ADD CONSTRAINT \n";

            // Add the relation - if the name is in the dataset use it.
            if (string.IsNullOrEmpty(relation.RelationName))
            {
                sql += "FK_" + childTableName + "_" + parentTableName;
            }
            else
            {
                sql += relation.RelationName;
            }

            sql += " FOREIGN KEY \n(\n";

            // Set up the keys for the Columns that have foreign 

            for (int i = 0; i < relation.ChildKeyConstraint.Columns.Length; i++)
            {

                sql += relation.ChildKeyConstraint.Columns[i].ColumnName;

                if ((relation.ChildKeyConstraint.Columns.Length > 1 ) & i < (relation.ChildKeyConstraint.Columns.Length - 1))
                {
                    sql += ",";
                }

                sql += "\n";

            }


            // Set up the reference columns.

            sql += "\n) REFERENCES " + parentTableName + "\n(\n";

            //   int cols = relation.ParentKeyConstraint.Columns.Length;

            for (int i = 0; i < relation.ParentKeyConstraint.Columns.Length; i++)
            {

                sql += relation.ParentKeyConstraint.Columns[i].ColumnName;

                if ((relation.ParentKeyConstraint.Columns.Length > 1) & i < (relation.ParentKeyConstraint.Columns.Length - 1))
                {
                    sql += ",";
                }

                sql += "\n";

            }

            sql += ") \n ON UPDATE NO ACTION  \n ON DELETE NO ACTION";


            return sql;
        }




        /// <summary>
        /// 
        /// </summary>
        /// <param name="schema"></param>
        /// <returns></returns>
        public static string[] GetPrimaryKeys(DataTable schema)
        {
            List<string> keys = new List<string>();

            foreach (DataRow column in schema.Rows)
            {
                if (schema.Columns.Contains("IsKey") && (bool)column["IsKey"])
                    keys.Add(column["ColumnName"].ToString());
            }

            return keys.ToArray();
        }

        // Return T-SQL data type definition, based on schema definition for a column
        public static string SQLGetType(object type, int columnSize, int numericPrecision, int numericScale)
        {
            switch (type.ToString())
            {
                case "System.String":
                    return "VARCHAR(" + ((columnSize == -1) ? "255" : (columnSize > 8000) ? "MAX" : columnSize.ToString()) + ")";

                case "System.Decimal":
                    if (numericScale > 0)
                        return "REAL";
                    else if (numericPrecision > 10)
                        return "BIGINT";
                    else
                        return "INT";

                case "System.Double":
                case "System.Single":
                    return "REAL";

                case "System.Int64":
                    return "BIGINT";

                case "System.Int16":
                case "System.Int32":
                    return "INT";

                case "System.DateTime":
                    return "DATETIME";

                case "System.Boolean":
                    return "BIT";

                case "System.Byte":
                    return "TINYINT";

                case "System.Guid":
                    return "UNIQUEIDENTIFIER";

                default:
                    throw new Exception(type.ToString() + " not implemented.");
            }
        }

        // Overload based on row from schema table
        public static string SQLGetType(DataRow schemaRow)
        {
            return SQLGetType(schemaRow["DataType"],
                                int.Parse(schemaRow["ColumnSize"].ToString()),
                                int.Parse(schemaRow["NumericPrecision"].ToString()),
                                int.Parse(schemaRow["NumericScale"].ToString()));
        }
        // Overload based on DataColumn from DataTable type
        public static string SQLGetType(DataColumn column)
        {
            return SQLGetType(column.DataType, column.MaxLength, 10, 2);
        }
        #endregion

        /// <summary>
        /// 
        /// </summary>
        /// <param name="connectionString"></param>
        /// <param name="tableName"></param>
        /// <param name="table"></param>
        public static void BulkInsertDataTable(string connectionString, string tableName, DataTable table)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlBulkCopy bulkCopy =
                    new SqlBulkCopy
                    (
                    connection,
                    SqlBulkCopyOptions.TableLock |
                    SqlBulkCopyOptions.FireTriggers |
                    SqlBulkCopyOptions.UseInternalTransaction,
                    null
                    );

                bulkCopy.DestinationTableName = tableName;
                connection.Open();

                bulkCopy.WriteToServer(table);
                connection.Close();
            }
        }
    }


    /// <summary>
    /// 
    /// </summary>
    public class CreateServerModel
    {

        public void CreateServerTables(DataSet ds, SqlConnection conn)
        {

            TableCreator STC = new TableCreator(conn);

            STC.Connection.Open();
            foreach (DataTable dt in ds.Tables)
            {

                STC.CreateFromDataTable(dt);

            }
            STC.Connection.Close();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="ds"></param>
        /// <param name="conn"></param>
        public void CreateTableRelations(DataSet ds, SqlConnection conn)
        {

            TableCreator STC = new TableCreator(conn);

            STC.Connection.Open();

            foreach (DataRelation relation in ds.Relations)
            {
                //STC.Get
                //string chTblName = item.ChildTable.TableName;
                //string prntTblName = item.ParentTable.TableName;


                //List<DataColumn> lchColumns = relation.ChildKeyConstraint.Columns.ToList();
                //List<DataColumn> parColumns = relation.ParentKeyConstraint.Columns.ToList();
                //string prntTblName = relation.ParentTable.TableName;
                try
                {
                    STC.CreateRelationFromDataSet(relation);
                }
                catch (Exception ex)
                {
                    string msg = ex.Message.ToString();
                    // throw;
                    msg += "";
                }


            }

            STC.Connection.Close();
        }

    }
}