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Radarr/Migrator.net/Migrator.Providers/Dialect.cs
2011-06-19 13:43:47 -07:00

193 lines
No EOL
6.2 KiB
C#

using System;
using System.Data;
using System.Collections.Generic;
using Migrator.Framework;
namespace Migrator.Providers
{
/// <summary>
/// Defines the implementations specific details for a particular database.
/// </summary>
public abstract class Dialect
{
private readonly Dictionary<ColumnProperty, string> propertyMap = new Dictionary<ColumnProperty, string>();
private readonly TypeNames typeNames = new TypeNames();
protected Dialect()
{
RegisterProperty(ColumnProperty.Null, "NULL");
RegisterProperty(ColumnProperty.NotNull, "NOT NULL");
RegisterProperty(ColumnProperty.Unique, "UNIQUE");
RegisterProperty(ColumnProperty.PrimaryKey, "PRIMARY KEY");
}
public abstract Type TransformationProvider { get; }
public ITransformationProvider NewProviderForDialect(string connectionString)
{
return (ITransformationProvider)Activator.CreateInstance(TransformationProvider, this, connectionString);
}
/// <summary>
/// Subclasses register a typename for the given type code and maximum
/// column length. <c>$l</c> in the type name will be replaced by the column
/// length (if appropriate)
/// </summary>
/// <param name="code">The typecode</param>
/// <param name="capacity">Maximum length of database type</param>
/// <param name="name">The database type name</param>
protected void RegisterColumnType(DbType code, int capacity, string name)
{
typeNames.Put(code, capacity, name);
}
/// <summary>
/// Suclasses register a typename for the given type code. <c>$l</c> in the
/// typename will be replaced by the column length (if appropriate).
/// </summary>
/// <param name="code">The typecode</param>
/// <param name="name">The database type name</param>
protected void RegisterColumnType(DbType code, string name)
{
typeNames.Put(code, name);
}
public ColumnPropertiesMapper GetColumnMapper(Column column)
{
string type = column.Size > 0 ? GetTypeName(column.Type, column.Size) : GetTypeName(column.Type);
if (!IdentityNeedsType && column.IsIdentity)
type = String.Empty;
return new ColumnPropertiesMapper(this, type);
}
/// <summary>
/// Get the name of the database type associated with the given
/// </summary>
/// <param name="type">The DbType</param>
/// <returns>The database type name used by ddl.</returns>
public virtual string GetTypeName(DbType type)
{
string result = typeNames.Get(type);
if (result == null)
{
throw new Exception(string.Format("No default type mapping for DbType {0}", type));
}
return result;
}
/// <summary>
/// Get the name of the database type associated with the given
/// </summary>
/// <param name="type">The DbType</param>
/// <returns>The database type name used by ddl.</returns>
/// <param name="length"></param>
public virtual string GetTypeName(DbType type, int length)
{
return GetTypeName(type, length, 0, 0);
}
/// <summary>
/// Get the name of the database type associated with the given
/// </summary>
/// <param name="type">The DbType</param>
/// <returns>The database type name used by ddl.</returns>
/// <param name="length"></param>
/// <param name="precision"></param>
/// <param name="scale"></param>
public virtual string GetTypeName(DbType type, int length, int precision, int scale)
{
string resultWithLength = typeNames.Get(type, length, precision, scale);
if (resultWithLength != null)
return resultWithLength;
return GetTypeName(type);
}
public void RegisterProperty(ColumnProperty property, string sql)
{
if (!propertyMap.ContainsKey(property))
{
propertyMap.Add(property, sql);
}
propertyMap[property] = sql;
}
public string SqlForProperty(ColumnProperty property)
{
if (propertyMap.ContainsKey(property))
{
return propertyMap[property];
}
return String.Empty;
}
public virtual bool ColumnNameNeedsQuote
{
get { return false; }
}
public virtual bool TableNameNeedsQuote
{
get { return false; }
}
public virtual bool ConstraintNameNeedsQuote
{
get { return false; }
}
public virtual bool IdentityNeedsType
{
get { return true; }
}
public virtual bool NeedsNotNullForIdentity
{
get { return true; }
}
public virtual bool SupportsIndex
{
get { return true; }
}
public virtual string Quote(string value)
{
return String.Format(QuoteTemplate, value);
}
public virtual string QuoteTemplate
{
get { return "\"{0}\""; }
}
public virtual string Default(object defaultValue)
{
if (defaultValue is String && defaultValue.ToString() == String.Empty)
{
defaultValue = "''";
}
return String.Format("DEFAULT {0}", defaultValue);
}
public ColumnPropertiesMapper GetAndMapColumnProperties(Column column)
{
ColumnPropertiesMapper mapper = GetColumnMapper(column);
mapper.MapColumnProperties(column);
if (column.DefaultValue != null)
{
if (column.DefaultValue is String && column.DefaultValue.ToString() == string.Empty)
{
column.DefaultValue = @"''";
}
mapper.Default = column.DefaultValue;
}
return mapper;
}
}
}