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DatabaseSchema.cs
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180 lines (154 loc) · 6.54 KB
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Data;
using System.Linq;
namespace Simple.Data.Ado.Schema
{
public class DatabaseSchema
{
private static readonly ConcurrentDictionary<string, DatabaseSchema> Instances = new ConcurrentDictionary<string, DatabaseSchema>();
private readonly ProviderHelper _providerHelper;
private readonly ISchemaProvider _schemaProvider;
private readonly Lazy<TableCollection> _lazyTables;
private readonly Lazy<ProcedureCollection> _lazyProcedures;
private readonly Lazy<Operators> _operators;
private string _defaultSchema;
private DatabaseSchema(ISchemaProvider schemaProvider, ProviderHelper providerHelper)
{
_lazyTables = new Lazy<TableCollection>(CreateTableCollection);
_lazyProcedures = new Lazy<ProcedureCollection>(CreateProcedureCollection);
_operators = new Lazy<Operators>(CreateOperators);
_schemaProvider = schemaProvider;
_providerHelper = providerHelper;
}
public ProviderHelper ProviderHelper
{
get { return _providerHelper; }
}
public ISchemaProvider SchemaProvider
{
get { return _schemaProvider; }
}
public bool IsAvailable
{
get { return _schemaProvider != null; }
}
public IEnumerable<Table> Tables
{
get { return _lazyTables.Value.AsEnumerable(); }
}
public bool IsTable(string name)
{
try
{
var table = FindTable(name);
return table != null;
}
catch (UnresolvableObjectException)
{
return false;
}
}
public Table FindTable(string tableName)
{
if (!string.IsNullOrWhiteSpace(DefaultSchema) && !(tableName.Contains(".")))
{
tableName = DefaultSchema + "." + tableName;
}
return _lazyTables.Value.Find(tableName);
}
public Table FindTable(ObjectName tableName)
{
return _lazyTables.Value.Find(tableName);
}
public Procedure FindProcedure(string procedureName)
{
if (!string.IsNullOrWhiteSpace(DefaultSchema) && !(procedureName.Contains(".")))
{
procedureName = DefaultSchema + "." + procedureName;
}
return _lazyProcedures.Value.Find(procedureName);
}
public Procedure FindProcedure(ObjectName procedureName)
{
if (string.IsNullOrWhiteSpace(procedureName.Schema) && !string.IsNullOrWhiteSpace(DefaultSchema))
{
procedureName = new ObjectName(DefaultSchema, procedureName.Name);
}
return _lazyProcedures.Value.Find(procedureName);
}
private string DefaultSchema
{
get { return _defaultSchema ?? (_defaultSchema = _schemaProvider.GetDefaultSchema() ?? string.Empty); }
}
private TableCollection CreateTableCollection()
{
return new TableCollection(_schemaProvider.GetTables()
.Select(table => new Table(table.ActualName, table.Schema, table.Type, this)));
}
private ProcedureCollection CreateProcedureCollection()
{
return new ProcedureCollection(_schemaProvider.GetStoredProcedures()
.Select(
proc =>
new Procedure(proc.Name, proc.SpecificName, proc.Schema,
this)), _schemaProvider.GetDefaultSchema());
}
public string QuoteObjectName(string unquotedName)
{
return _schemaProvider.QuoteObjectName(unquotedName);
}
public string QuoteObjectName(ObjectName unquotedName)
{
if (!string.IsNullOrWhiteSpace(unquotedName.Schema))
return _schemaProvider.QuoteObjectName(unquotedName.Schema) + '.' + _schemaProvider.QuoteObjectName(unquotedName.Name);
else
return _schemaProvider.QuoteObjectName(unquotedName.Name);
}
public static DatabaseSchema Get(IConnectionProvider connectionProvider, ProviderHelper providerHelper)
{
var instance = connectionProvider is ISchemaConnectionProvider
? Instances.GetOrAdd(((ISchemaConnectionProvider)connectionProvider).ConnectionProviderKey, sp => new DatabaseSchema(connectionProvider.GetSchemaProvider(), providerHelper))
: Instances.GetOrAdd(connectionProvider.ConnectionString, sp => new DatabaseSchema(connectionProvider.GetSchemaProvider(), providerHelper));
return instance;
}
public static void ClearCache()
{
Instances.Clear();
}
public ObjectName BuildObjectName(String text)
{
if (text == null) throw new ArgumentNullException("text");
if (!text.Contains('.')) return new ObjectName(this.DefaultSchema, text);
var schemaDotTable = text.Split('.');
if (schemaDotTable.Length != 2) throw new InvalidOperationException(string.Format("Could not parse table name '{0}'.", text));
return new ObjectName(schemaDotTable[0], schemaDotTable[1]);
}
public RelationType GetRelationType(string fromTableName, string toTableName)
{
var fromTable = FindTable(fromTableName);
if (fromTable.GetMaster(toTableName) != null) return RelationType.ManyToOne;
if (fromTable.GetDetail(toTableName) != null) return RelationType.OneToMany;
return RelationType.None;
}
public bool IsProcedure(string procedureName)
{
return _lazyProcedures.Value.IsProcedure(procedureName);
}
public Operators Operators
{
get { return _operators.Value; }
}
private Operators CreateOperators()
{
return ProviderHelper.GetCustomProvider<Operators>(_schemaProvider) ?? new Operators();
}
}
public enum RelationType
{
None,
OneToMany,
ManyToOne
}
}