重复:从 XML 生成 SQL 架构
在我正在进行的项目中，我需要支持强类型数据集以将数据存储为 XML，或将数据存储在 sql server 中.现在我已经创建了 XSD 架构，我希望能够使用 XSD 中定义的表和关系创建一个 sql server 数据库.
In a project i am working on, i have a need to support either a strongly-typed dataset for storing the data as XML, or storing the data in sql server. Now i already have the XSD schema created and i would like to be able to create a sql server database using the tables and relationships defined in the XSD.
这可能吗?如果是这样，解决这个问题的最佳方法是什么?
Is this possible? and if so, what is the best way to approach this problem?
说明:我正在寻找的是一种在运行时使用 C# 和 SQL Server 通过代码执行上述操作的方法.这个可以吗?
Clarification: What i'm looking for is a way to do the above via code at runtime with C# and SQL Server. Can this be done?
我设法提出了以下基于 SQL Server 管理对象的类:
I managed to come up with the following class based on the SQL Server Management Objects:
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Text;
using Microsoft.SqlServer.Management.Common;
using Microsoft.SqlServer.Management.Smo;
using Rule=System.Data.Rule;
namespace XSD2SQL
{
public class XSD2SQL
{
private readonly Server _server;
private readonly SqlConnection _connection;
private Database _db;
private DataSet _source;
private string _databaseName;
public XSD2SQL(string connectionString, DataSet source)
{
_connection = new SqlConnection(connectionString);
_server = new Server(new ServerConnection(_connection));
_source = source;
}
public void CreateDatabase(string databaseName)
{
_databaseName = databaseName;
_db = _server.Databases[databaseName];
if (_db != null) _db.Drop();
_db = new Database(_server, _databaseName);
_db.Create();
}
public void PopulateDatabase()
{
CreateTables(_source.Tables);
CreateRelationships();
}
private void CreateRelationships()
{
foreach (DataTable table in _source.Tables)
{
foreach (DataRelation rel in table.ChildRelations)
CreateRelation(rel);
}
}
private void CreateRelation(DataRelation relation)
{
Table primaryTable = _db.Tables[relation.ParentTable.TableName];
Table childTable = _db.Tables[relation.ChildTable.TableName];
ForeignKey fkey = new ForeignKey(childTable, relation.RelationName);
fkey.ReferencedTable = primaryTable.Name;
fkey.DeleteAction = SQLActionTypeToSMO(relation.ChildKeyConstraint.DeleteRule);
fkey.UpdateAction = SQLActionTypeToSMO(relation.ChildKeyConstraint.UpdateRule);
for (int i = 0; i < relation.ChildColumns.Length; i++)
{
DataColumn col = relation.ChildColumns[i];
ForeignKeyColumn fkc = new ForeignKeyColumn(fkey, col.ColumnName, relation.ParentColumns[i].ColumnName);
fkey.Columns.Add(fkc);
}
fkey.Create();
}
private void CreateTables(DataTableCollection tables)
{
foreach (DataTable table in tables)
{
DropExistingTable(table.TableName);
Table newTable = new Table(_db, table.TableName);
PopulateTable(ref newTable, table);
SetPrimaryKeys(ref newTable, table);
newTable.Create();
}
}
private void PopulateTable(ref Table outputTable, DataTable inputTable)
{
foreach (DataColumn column in inputTable.Columns)
{
CreateColumns(ref outputTable, column, inputTable);
}
}
private void CreateColumns(ref Table outputTable, DataColumn inputColumn, DataTable inputTable)
{
Column newColumn = new Column(outputTable, inputColumn.ColumnName);
newColumn.DataType = CLRTypeToSQLType(inputColumn.DataType);
newColumn.Identity = inputColumn.AutoIncrement;
newColumn.IdentityIncrement = inputColumn.AutoIncrementStep;
newColumn.IdentitySeed = inputColumn.AutoIncrementSeed;
newColumn.Nullable = inputColumn.AllowDBNull;
newColumn.UserData = inputColumn.DefaultValue;
outputTable.Columns.Add(newColumn);
}
private void SetPrimaryKeys(ref Table outputTable, DataTable inputTable)
{
Index newIndex = new Index(outputTable, "PK_" + outputTable.Name);
newIndex.IndexKeyType = IndexKeyType.DriPrimaryKey;
newIndex.IsClustered = false;
foreach (DataColumn keyColumn in inputTable.PrimaryKey)
{
newIndex.IndexedColumns.Add(new IndexedColumn(newIndex, keyColumn.ColumnName, true));
}
if (newIndex.IndexedColumns.Count > 0)
outputTable.Indexes.Add(newIndex);
}
private DataType CLRTypeToSQLType(Type type)
{
switch (type.Name)
{
case "String":
return DataType.NVarCharMax;
case "Int32":
return DataType.Int;
case "Boolean":
return DataType.Bit;
case "DateTime":
return DataType.DateTime;
case "Byte[]":
return DataType.VarBinaryMax;
}
return DataType.NVarCharMax;
}
private ForeignKeyAction SQLActionTypeToSMO(Rule rule)
{
string ruleStr = rule.ToString();
return (ForeignKeyAction)Enum.Parse(typeof (ForeignKeyAction), ruleStr);
}
private void DropExistingTable(string tableName)
{
Table table = _db.Tables[tableName];
if (table != null) table.Drop();
}
}
}
它尚未经过严格测试，需要映射出更多 SQL 到 CLR 类型，但它确实创建了一个新数据库，包含所有表、列、主键和外键.
It hasn't been rigorously tested yet, and there needs to be more SQL to CLR types mapped out, but it does create a new database, all the tables, columns, primary keys, and foreign keys.
要使此代码正常工作，需要引用一些程序集:
For this code to work, a few assemblies need to be referenced:
Microsoft.SqlServer.ConnectionInfo
Microsoft.SqlServer.Management.Sdk.Sfc
Microsoft.SqlServer.Smo
Microsoft.SqlServer.SqlEnum
希望这对其他人有所帮助.
Hope this helps someone else out.
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