Created
March 16, 2015 08:21
-
-
Save flaub/1968486e1b3f2b9fddaf to your computer and use it in GitHub Desktop.
SQLite EF 6 Database Initializer
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
using System; | |
using System.Collections.Generic; | |
using System.Data.Entity; | |
using System.Data.Entity.ModelConfiguration.Conventions; | |
using System.Data.SQLite; | |
using System.Linq; | |
namespace SQliteEF6 | |
{ | |
class SqliteContext : DbContext | |
{ | |
// | |
// Add your DbSet<T>... here | |
// | |
private string _dbPath; | |
public SqliteContext(string path) | |
: base(new SQLiteConnection | |
{ | |
ConnectionString = new SQLiteConnectionStringBuilder | |
{ | |
DataSource = path, | |
ForeignKeys = true, | |
BinaryGUID = false, | |
}.ConnectionString | |
}, true) | |
{ | |
_dbPath = path; | |
Database.Log = Console.Write; | |
} | |
protected override void OnModelCreating(DbModelBuilder modelBuilder) | |
{ | |
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>(); | |
Database.SetInitializer(new SqliteContextInitializer<JobContext>(_dbPath, modelBuilder)); | |
} | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
using System; | |
using System.Collections.Generic; | |
using System.ComponentModel.DataAnnotations.Schema; | |
using System.Data.Entity; | |
using System.Linq; | |
using System.Reflection; | |
using System.ComponentModel.DataAnnotations; | |
using System.Diagnostics; | |
using System.IO; | |
using System.Collections; | |
using System.Data.Entity.Core.Metadata.Edm; | |
using System.Data.Entity.Infrastructure; | |
using System.Data.Entity.Infrastructure.Annotations; | |
namespace SQliteEF6 | |
{ | |
class SqliteContextInitializer<T> : IDatabaseInitializer<T> | |
where T : DbContext | |
{ | |
bool _dbExists; | |
DbModelBuilder _modelBuilder; | |
public SqliteContextInitializer(string dbPath, DbModelBuilder modelBuilder) | |
{ | |
_dbExists = File.Exists(dbPath); | |
_modelBuilder = modelBuilder; | |
} | |
public void InitializeDatabase(T context) | |
{ | |
if (_dbExists) | |
return; | |
var model = _modelBuilder.Build(context.Database.Connection); | |
using (var xact = context.Database.BeginTransaction()) | |
{ | |
try | |
{ | |
CreateDatabase(context.Database, model); | |
xact.Commit(); | |
} | |
catch (Exception) | |
{ | |
xact.Rollback(); | |
throw; | |
} | |
} | |
} | |
class Index | |
{ | |
public string Name { get; set; } | |
public string Table { get; set; } | |
public List<string> Columns { get; set; } | |
} | |
private void CreateDatabase(Database db, DbModel model) | |
{ | |
const string tableTmpl = "CREATE TABLE [{0}] (\n{1}\n);"; | |
const string columnTmpl = " [{0}] {1} {2}"; // name, type, decl | |
const string primaryKeyTmpl = " PRIMARY KEY ({0})"; | |
const string foreignKeyTmpl = " FOREIGN KEY ({0}) REFERENCES {1} ({2})"; | |
const string indexTmpl = "CREATE INDEX {0} ON {1} ({2});"; | |
var indicies = new Dictionary<string, Index>(); | |
foreach (var type in model.StoreModel.EntityTypes) | |
{ | |
var defs = new List<string>(); | |
// columns | |
foreach (var p in type.Properties) | |
{ | |
var decls = new HashSet<string>(); | |
if (!p.Nullable) | |
decls.Add("NOT NULL"); | |
var annotations = p.MetadataProperties | |
.Select(x => x.Value) | |
.OfType<IndexAnnotation>(); | |
foreach (var annotation in annotations) | |
{ | |
foreach (var attr in annotation.Indexes) | |
{ | |
if (attr.IsUnique) | |
decls.Add("UNIQUE"); | |
if (string.IsNullOrEmpty(attr.Name)) | |
continue; | |
Index index; | |
if (!indicies.TryGetValue(attr.Name, out index)) | |
{ | |
index = new Index | |
{ | |
Name = attr.Name, | |
Table = type.Name, | |
Columns = new List<string>(), | |
}; | |
indicies.Add(index.Name, index); | |
} | |
index.Columns.Add(p.Name); | |
} | |
} | |
defs.Add(string.Format(columnTmpl, p.Name, p.TypeName, string.Join(" ", decls))); | |
} | |
// primary keys | |
if (type.KeyProperties.Any()) | |
{ | |
var keys = type.KeyProperties.Select(x => x.Name); | |
defs.Add(string.Format(primaryKeyTmpl, string.Join(", ", keys))); | |
} | |
// foreign keys | |
foreach (var assoc in model.StoreModel.AssociationTypes) | |
{ | |
if (assoc.Constraint.ToRole.Name == type.Name) | |
{ | |
var thisKeys = assoc.Constraint.ToProperties.Select(x => x.Name); | |
var thatKeys = assoc.Constraint.FromProperties.Select(x => x.Name); | |
defs.Add(string.Format(foreignKeyTmpl, | |
string.Join(", ", thisKeys), | |
assoc.Constraint.FromRole.Name, | |
string.Join(", ", thatKeys))); | |
} | |
} | |
// create table | |
var sql = string.Format(tableTmpl, type.Name, string.Join(",\n", defs)); | |
db.ExecuteSqlCommand(sql); | |
} | |
// create index | |
foreach (var index in indicies.Values) | |
{ | |
var columns = string.Join(", ", index.Columns); | |
var sql = string.Format(indexTmpl, index.Name, index.Table, columns); | |
db.ExecuteSqlCommand(sql); | |
} | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
I very need example in using.
Please write for example, how i'm created a table?