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FullTextIndexInitializer.cs
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FullTextIndexInitializer.cs
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using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;
using System.Linq;
using System.Reflection;
namespace jamescms
{
public class FullTextIndexInitializer<T> : IDatabaseInitializer<T> where T : DbContext
{
private const string FullTextQuery = "SELECT name FROM sys.fulltext_catalogs";
private const string CreateFullTextCatalogQueryTemplate = "CREATE FULLTEXT CATALOG {catalogName}";
private const string CreateFullTextIndexQueryTemplate = "CREATE FULLTEXT INDEX ON {tableName}({columnName}) KEY INDEX {primaryKey} ON {catalogName}";
public void InitializeDatabase(T context)
{
const BindingFlags PublicInstance = BindingFlags.Public | BindingFlags.Instance;
foreach (var dataSetProperty in typeof(T).GetProperties(PublicInstance).Where(
p => p.PropertyType.Name == typeof(IDbSet<>).Name))
{
var entityType = dataSetProperty.PropertyType.GetGenericArguments().Single();
TableAttribute[] tableAttributes = (TableAttribute[])entityType.GetCustomAttributes(typeof(TableAttribute), false);
FullTextIndexAttribute[] indexAttributes = (FullTextIndexAttribute[])entityType.GetCustomAttributes(typeof(FullTextIndexAttribute), false);
NotMappedAttribute[] notMappedAttributes = (NotMappedAttribute[])entityType.GetCustomAttributes(typeof(NotMappedAttribute), false);
if (indexAttributes.Length > 0 && notMappedAttributes.Length == 0)
{
ColumnAttribute[] columnAttributes = (ColumnAttribute[])dataSetProperty.GetCustomAttributes(typeof(ColumnAttribute), false);
foreach (var indexAttribute in indexAttributes)
{
string catalogName = indexAttribute.Name;
string tableName = tableAttributes.Length != 0 ? tableAttributes[0].Name : dataSetProperty.Name;
string columnName = columnAttributes.Length != 0 ? columnAttributes[0].Name : dataSetProperty.Name;
string catalogQuery = CreateFullTextCatalogQueryTemplate.Replace("{catalogName}", catalogName);
string indexQuery = CreateFullTextIndexQueryTemplate.Replace("{catalogName}", catalogName)
.Replace("{tableName}", tableName)
.Replace("{columnName}", columnName)
.Replace("{primaryKey}", "PK_DBO." + tableName);
context.Database.CreateIfNotExists();
bool indexExists = false;
var results = context.Database.SqlQuery(typeof(string), FullTextQuery);
foreach (string result in results)
{
if (result == catalogName)
indexExists = true;
}
if (!indexExists)
{
context.Database.ExecuteSqlCommand(catalogQuery);
context.Database.ExecuteSqlCommand(indexQuery);
}
}
}
}
}
}
}