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// NpgsqlMigrationSqlGenerator.cs
//
// Author:
// David Karlaš (david.karlas@gmail.com)
//
// Copyright (C) 2014 David Karlaš
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
using System;
using System.Collections.Generic;
using System.Data.Entity.Migrations.Model;
using System.Data.Entity.Migrations.Sql;
using System.Globalization;
using System.Text;
using System.Data.Entity.Core.Metadata.Edm;
using System.Data.Entity.Spatial;
namespace Npgsql
{
public class NpgsqlMigrationSqlGenerator : MigrationSqlGenerator
{
List<MigrationStatement> migrationStatments;
private List<string> addedSchemas;
private List<string> addedExtensions;
private Version serverVersion;
public override IEnumerable<MigrationStatement> Generate(
IEnumerable<MigrationOperation> migrationOperations, string providerManifestToken)
{
migrationStatments = new List<MigrationStatement>();
addedSchemas = new List<string>();
addedExtensions = new List<string>();
serverVersion = new Version(providerManifestToken);
Convert(migrationOperations);
return migrationStatments;
}
#region MigrationOperation to MigrationStatement converters
#region General
private void Convert(IEnumerable<MigrationOperation> operations)
{
foreach (var migrationOperation in operations)
{
if (migrationOperation is AddColumnOperation)
{
Convert(migrationOperation as AddColumnOperation);
}
else if (migrationOperation is AlterColumnOperation)
{
Convert(migrationOperation as AlterColumnOperation);
}
else if (migrationOperation is CreateTableOperation)
{
Convert(migrationOperation as CreateTableOperation);
}
else if (migrationOperation is DropForeignKeyOperation)
{
Convert(migrationOperation as DropForeignKeyOperation);
}
else if (migrationOperation is DropTableOperation)
{
Convert(migrationOperation as DropTableOperation);
}
else if (migrationOperation is MoveTableOperation)
{
Convert(migrationOperation as MoveTableOperation);
}
else if (migrationOperation is RenameTableOperation)
{
Convert(migrationOperation as RenameTableOperation);
}
else if (migrationOperation is AddForeignKeyOperation)
{
Convert(migrationOperation as AddForeignKeyOperation);
}
else if (migrationOperation is DropIndexOperation)
{
Convert(migrationOperation as DropIndexOperation);
}
else if (migrationOperation is SqlOperation)
{
AddStatment((migrationOperation as SqlOperation).Sql, (migrationOperation as SqlOperation).SuppressTransaction);
}
else if (migrationOperation is AddPrimaryKeyOperation)
{
Convert(migrationOperation as AddPrimaryKeyOperation);
}
else if (migrationOperation is CreateIndexOperation)
{
Convert(migrationOperation as CreateIndexOperation);
}
else if (migrationOperation is DropColumnOperation)
{
Convert(migrationOperation as DropColumnOperation);
}
else if (migrationOperation is DropPrimaryKeyOperation)
{
Convert(migrationOperation as DropPrimaryKeyOperation);
}
else if (migrationOperation is HistoryOperation)
{
Convert(migrationOperation as HistoryOperation);
}
else if (migrationOperation is RenameColumnOperation)
{
Convert(migrationOperation as RenameColumnOperation);
}
else if (migrationOperation is UpdateDatabaseOperation)
{
Convert((migrationOperation as UpdateDatabaseOperation).Migrations as IEnumerable<MigrationOperation>);
}
else
{
throw new NotImplementedException("Unhandled MigrationOperation " + migrationOperation.GetType().Name + " in " + GetType().Name);
}
}
}
private void AddStatment(string sql, bool suppressTransacion = false)
{
migrationStatments.Add(new MigrationStatement()
{
Sql = sql,
SuppressTransaction = suppressTransacion,
BatchTerminator = ";"
});
}
private void AddStatment(StringBuilder sql, bool suppressTransacion = false)
{
AddStatment(sql.ToString(), suppressTransacion);
}
#endregion
#region History
private void Convert(HistoryOperation historyOperation)
{
foreach (var command in historyOperation.CommandTrees)
{
AddStatment(NpgsqlServices.Instance.CreateDbCommand(command).CommandText);
}
}
#endregion
#region Tables
private void Convert(CreateTableOperation createTableOperation)
{
StringBuilder sql = new StringBuilder();
CreateSchema(createTableOperation.Name);
sql.Append("CREATE TABLE ");
AppendTableName(createTableOperation.Name, sql);
sql.Append('(');
foreach (var column in createTableOperation.Columns)
{
AppendColumn(column, sql);
sql.Append(",");
}
sql.Remove(sql.Length - 1, 1);
if (createTableOperation.PrimaryKey != null)
{
sql.Append(",");
sql.Append("CONSTRAINT ");
sql.Append('"');
sql.Append(createTableOperation.PrimaryKey.Name);
sql.Append('"');
sql.Append(" PRIMARY KEY ");
sql.Append("(");
foreach (var column in createTableOperation.PrimaryKey.Columns)
{
sql.Append('"');
sql.Append(column);
sql.Append("\",");
}
sql.Remove(sql.Length - 1, 1);
sql.Append(")");
}
sql.Append(")");
AddStatment(sql);
}
private void Convert(DropTableOperation dropTableOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("DROP TABLE ");
AppendTableName(dropTableOperation.Name, sql);
AddStatment(sql);
}
private void Convert(RenameTableOperation renameTableOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(renameTableOperation.Name, sql);
sql.Append(" RENAME TO ");
AppendTableName(renameTableOperation.NewName, sql);
AddStatment(sql);
}
private void CreateSchema(string schemaName)
{
int dotIndex = schemaName.IndexOf('.');
if (dotIndex != -1)
schemaName = schemaName.Remove(dotIndex);
if (addedSchemas.Contains(schemaName))
return;
addedSchemas.Add(schemaName);
if (serverVersion.Major > 9 || (serverVersion.Major == 9 && serverVersion.Minor >= 3))
{
AddStatment("CREATE SCHEMA IF NOT EXISTS " + schemaName);
}
else
{
//TODO: CREATE PROCEDURE that checks if schema already exists on servers < 9.3
AddStatment("CREATE SCHEMA " + schemaName);
}
}
//private void CreateExtension(string exensionName)
//{
// //This is compatible only with server 9.1+
// if (serverVersion.Major > 9 || (serverVersion.Major == 9 && serverVersion.Minor >= 1))
// {
// if (addedExtensions.Contains(exensionName))
// return;
// addedExtensions.Add(exensionName);
// AddStatment("CREATE EXTENSION IF NOT EXISTS \"" + exensionName + "\"");
// }
//}
private void Convert(MoveTableOperation moveTableOperation)
{
StringBuilder sql = new StringBuilder();
var newSchema = moveTableOperation.NewSchema ?? "dbo";
CreateSchema(newSchema);
sql.Append("ALTER TABLE ");
AppendTableName(moveTableOperation.Name, sql);
sql.Append(" SET SCHEMA ");
sql.Append(newSchema);
AddStatment(sql);
}
#endregion
#region Columns
private void Convert(AddColumnOperation addColumnOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(addColumnOperation.Table, sql);
sql.Append(" ADD ");
AppendColumn(addColumnOperation.Column, sql);
AddStatment(sql);
}
private void Convert(DropColumnOperation dropColumnOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(dropColumnOperation.Table, sql);
sql.Append(" DROP COLUMN \"");
sql.Append(dropColumnOperation.Name);
sql.Append('"');
AddStatment(sql);
}
private void Convert(AlterColumnOperation alterColumnOperation)
{
StringBuilder sql = new StringBuilder();
//TYPE
AppendAlterColumn(alterColumnOperation, sql);
sql.Append(" TYPE ");
AppendColumnType(alterColumnOperation.Column, sql, false);
AddStatment(sql);
sql.Clear();
//NOT NULL
AppendAlterColumn(alterColumnOperation, sql);
if (alterColumnOperation.Column.IsNullable != null && !alterColumnOperation.Column.IsNullable.Value)
sql.Append(" SET NOT NULL");
else
sql.Append(" DROP NOT NULL");
AddStatment(sql);
sql.Clear();
//DEFAULT
AppendAlterColumn(alterColumnOperation, sql);
if (alterColumnOperation.Column.DefaultValue != null)
{
sql.Append(" SET DEFAULT ");
AppendValue(alterColumnOperation.Column.DefaultValue, sql);
}
else if (!string.IsNullOrWhiteSpace(alterColumnOperation.Column.DefaultValueSql))
{
sql.Append(" SET DEFAULT ");
sql.Append(alterColumnOperation.Column.DefaultValueSql);
}
else if (alterColumnOperation.Column.IsIdentity)
{
sql.Append(" SET DEFAULT ");
switch (alterColumnOperation.Column.Type)
{
case PrimitiveTypeKind.Byte:
case PrimitiveTypeKind.SByte:
case PrimitiveTypeKind.Int16:
case PrimitiveTypeKind.Int32:
case PrimitiveTypeKind.Int64:
//TODO: need function CREATE SEQUENCE IF NOT EXISTS and set to it...
//Until this is resolved changing IsIdentity from false to true
//on types int2, int4 and int8 won't switch to type serial2, serial4 and serial8
throw new NotImplementedException("Not supporting creating sequence for integer types");
case PrimitiveTypeKind.Guid:
//CreateExtension("uuid-ossp");
//If uuid-ossp is not enabled migrations throw exception
AddStatment("select * from uuid_generate_v4()");
sql.Append("uuid_generate_v4()");
break;
default:
throw new NotImplementedException("Not supporting creating IsIdentity for " + alterColumnOperation.Column.Type);
}
}
else
{
sql.Append(" DROP DEFAULT");
}
AddStatment(sql);
}
private void AppendAlterColumn(AlterColumnOperation alterColumnOperation, StringBuilder sql)
{
sql.Append("ALTER TABLE ");
AppendTableName(alterColumnOperation.Table, sql);
sql.Append(" ALTER COLUMN \"");
sql.Append(alterColumnOperation.Column.Name);
sql.Append('"');
}
private void Convert(RenameColumnOperation renameColumnOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(renameColumnOperation.Table, sql);
sql.Append(" RENAME COLUMN \"");
sql.Append(renameColumnOperation.Name);
sql.Append("\" TO \"");
sql.Append(renameColumnOperation.NewName);
sql.Append('"');
AddStatment(sql);
}
#endregion
#region Keys and indexes
private void Convert(AddForeignKeyOperation addForeignKeyOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(addForeignKeyOperation.DependentTable, sql);
sql.Append(" ADD CONSTRAINT \"");
sql.Append(addForeignKeyOperation.Name);
sql.Append("\" FOREIGN KEY (");
foreach (var column in addForeignKeyOperation.DependentColumns)
{
sql.Append('"');
sql.Append(column);
sql.Append("\",");
}
sql.Remove(sql.Length - 1, 1);
sql.Append(") REFERENCES ");
AppendTableName(addForeignKeyOperation.PrincipalTable, sql);
sql.Append(" (");
foreach (var column in addForeignKeyOperation.PrincipalColumns)
{
sql.Append('"');
sql.Append(column);
sql.Append("\",");
}
sql.Remove(sql.Length - 1, 1);
sql.Append(")");
if (addForeignKeyOperation.CascadeDelete)
{
sql.Append(" ON DELETE CASCADE");
}
AddStatment(sql);
}
private void Convert(DropForeignKeyOperation dropForeignKeyOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(dropForeignKeyOperation.DependentTable, sql);
if (serverVersion.Major < 9)
sql.Append(" DROP CONSTRAINT \"");//TODO: http://piecesformthewhole.blogspot.com/2011/04/dropping-foreign-key-if-it-exists-in.html ?
else
sql.Append(" DROP CONSTRAINT IF EXISTS \"");
sql.Append(dropForeignKeyOperation.Name);
sql.Append('"');
AddStatment(sql);
}
private void Convert(CreateIndexOperation createIndexOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("CREATE ");
if (createIndexOperation.IsUnique)
sql.Append("UNIQUE ");
sql.Append("INDEX \"");
sql.Append(GetTableNameFromFullTableName(createIndexOperation.Table) + "_" + createIndexOperation.Name);
sql.Append("\" ON ");
AppendTableName(createIndexOperation.Table, sql);
sql.Append(" (");
foreach (var column in createIndexOperation.Columns)
{
sql.Append('"');
sql.Append(column);
sql.Append("\",");
}
sql.Remove(sql.Length - 1, 1);
sql.Append(")");
AddStatment(sql);
}
private string GetSchemaNameFromFullTableName(string tableFullName)
{
int dotIndex = tableFullName.IndexOf('.');
if (dotIndex != -1)
return tableFullName.Remove(dotIndex);
else
return "dto";//TODO: Check always setting dto schema if no schema in table name is not bug
}
/// <summary>
/// Removes schema prefix e.g. "dto.Blogs" returns "Blogs" and "Posts" returns "Posts"
/// </summary>
/// <param name="tableName"></param>
/// <returns></returns>
private string GetTableNameFromFullTableName(string tableName)
{
int dotIndex = tableName.IndexOf('.');
if (dotIndex != -1)
return tableName.Substring(dotIndex + 1);
else
return tableName;
}
private void Convert(DropIndexOperation dropIndexOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("DROP INDEX IF EXISTS ");
sql.Append(GetSchemaNameFromFullTableName(dropIndexOperation.Table));
sql.Append(".\"");
sql.Append(GetTableNameFromFullTableName(dropIndexOperation.Table) + "_" + dropIndexOperation.Name);
sql.Append('"');
AddStatment(sql);
}
private void Convert(AddPrimaryKeyOperation addPrimaryKeyOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(addPrimaryKeyOperation.Table, sql);
sql.Append(" ADD CONSTRAINT \"");
sql.Append(addPrimaryKeyOperation.Name);
sql.Append("\" PRIMARY KEY ");
sql.Append("(");
foreach (var column in addPrimaryKeyOperation.Columns)
{
sql.Append('"');
sql.Append(column);
sql.Append("\",");
}
sql.Remove(sql.Length - 1, 1);
sql.Append(")");
AddStatment(sql);
}
private void Convert(DropPrimaryKeyOperation dropPrimaryKeyOperation)
{
StringBuilder sql = new StringBuilder();
sql.Append("ALTER TABLE ");
AppendTableName(dropPrimaryKeyOperation.Table, sql);
sql.Append(" DROP CONSTRAINT \"");
sql.Append(dropPrimaryKeyOperation.Name);
sql.Append('"');
AddStatment(sql);
}
#endregion
#endregion
#region Misc functions
private void AppendColumn(ColumnModel column, StringBuilder sql)
{
sql.Append('"');
sql.Append(column.Name);
sql.Append("\" ");
AppendColumnType(column, sql, true);
if (column.IsNullable != null && !column.IsNullable.Value)
sql.Append(" NOT NULL");
if (column.DefaultValue != null)
{
sql.Append(" DEFAULT ");
AppendValue(column.DefaultValue, sql);
}
else if (!string.IsNullOrWhiteSpace(column.DefaultValueSql))
{
sql.Append(" DEFAULT ");
sql.Append(column.DefaultValueSql);
}
else if (column.IsIdentity)
{
switch (column.Type)
{
case PrimitiveTypeKind.Guid:
//CreateExtension("uuid-ossp");
//If uuid-ossp is not enabled migrations throw exception
AddStatment("select * from uuid_generate_v4()");
sql.Append(" DEFAULT uuid_generate_v4()");
break;
case PrimitiveTypeKind.Byte:
case PrimitiveTypeKind.SByte:
case PrimitiveTypeKind.Int16:
case PrimitiveTypeKind.Int32:
case PrimitiveTypeKind.Int64:
//TODO: Add support for setting "SERIAL"
break;
}
}
else if (column.IsNullable != null
&& !column.IsNullable.Value
&& (column.StoreType == null ||
(column.StoreType.IndexOf("rowversion", StringComparison.OrdinalIgnoreCase) == -1)))
{
sql.Append(" DEFAULT ");
AppendValue(column.ClrDefaultValue, sql);
}
}
private void AppendColumnType(ColumnModel column, StringBuilder sql, bool setSerial)
{
switch (column.Type)
{
case PrimitiveTypeKind.Binary:
sql.Append("bytea");
break;
case PrimitiveTypeKind.Boolean:
sql.Append("boolean");
break;
case PrimitiveTypeKind.DateTime:
if (column.Precision != null)
sql.Append("timestamp(" + column.Precision + ")");
else
sql.Append("timestamp");
break;
case PrimitiveTypeKind.Decimal:
//TODO: Check if inside min/max
if (column.Precision == null && column.Scale == null)
{
sql.Append("numeric");
}
else
{
sql.Append("numeric(");
sql.Append(column.Precision ?? 19);
sql.Append(',');
sql.Append(column.Scale ?? 4);
sql.Append(')');
}
break;
case PrimitiveTypeKind.Double:
sql.Append("float8");
break;
case PrimitiveTypeKind.Guid:
sql.Append("uuid");
break;
case PrimitiveTypeKind.Single:
sql.Append("float4");
break;
case PrimitiveTypeKind.Byte://postgres doesn't support sbyte :(
case PrimitiveTypeKind.SByte://postgres doesn't support sbyte :(
case PrimitiveTypeKind.Int16:
if (setSerial)
sql.Append(column.IsIdentity ? "serial2" : "int2");
else
sql.Append("int2");
break;
case PrimitiveTypeKind.Int32:
if (setSerial)
sql.Append(column.IsIdentity ? "serial4" : "int4");
else
sql.Append("int4");
break;
case PrimitiveTypeKind.Int64:
if (setSerial)
sql.Append(column.IsIdentity ? "serial8" : "int8");
else
sql.Append("int8");
break;
case PrimitiveTypeKind.String:
sql.Append("text");
break;
case PrimitiveTypeKind.Time:
if (column.Precision != null)
{
sql.Append("interval(");
sql.Append(column.Precision);
sql.Append(')');
}
else
{
sql.Append("interval");
}
break;
case PrimitiveTypeKind.DateTimeOffset:
if (column.Precision != null)
{
sql.Append("timestamptz(");
sql.Append(column.Precision);
sql.Append(')');
}
else
{
sql.Append("timestamptz");
}
break;
case PrimitiveTypeKind.Geometry:
sql.Append("point");
break;
//case PrimitiveTypeKind.Geography:
// break;
//case PrimitiveTypeKind.GeometryPoint:
// break;
//case PrimitiveTypeKind.GeometryLineString:
// break;
//case PrimitiveTypeKind.GeometryPolygon:
// break;
//case PrimitiveTypeKind.GeometryMultiPoint:
// break;
//case PrimitiveTypeKind.GeometryMultiLineString:
// break;
//case PrimitiveTypeKind.GeometryMultiPolygon:
// break;
//case PrimitiveTypeKind.GeometryCollection:
// break;
//case PrimitiveTypeKind.GeographyPoint:
// break;
//case PrimitiveTypeKind.GeographyLineString:
// break;
//case PrimitiveTypeKind.GeographyPolygon:
// break;
//case PrimitiveTypeKind.GeographyMultiPoint:
// break;
//case PrimitiveTypeKind.GeographyMultiLineString:
// break;
//case PrimitiveTypeKind.GeographyMultiPolygon:
// break;
//case PrimitiveTypeKind.GeographyCollection:
// break;
default:
throw new ArgumentException("Unhandled column type:" + column.Type);
}
}
private void AppendTableName(string tableName, StringBuilder sql)
{
int dotIndex = tableName.IndexOf('.');
if (dotIndex == -1)
{
sql.Append('"');
sql.Append(tableName);
sql.Append('"');
}
else
{
sql.Append('"');
sql.Append(tableName.Remove(dotIndex));
sql.Append("\".\"");
sql.Append(tableName.Substring(dotIndex + 1));
sql.Append('"');
}
}
#endregion
#region Value appenders
private void AppendValue(byte[] values, StringBuilder sql)
{
if (values.Length == 0)
{
sql.Append("''");
}
else
{
sql.Append("E'\\\\");
foreach (var value in values)
sql.Append(value.ToString("X2"));
sql.Append("'");
}
}
private void AppendValue(bool value, StringBuilder sql)
{
sql.Append(value ? "TRUE" : "FALSE");
}
private void AppendValue(DateTime value, StringBuilder sql)
{
sql.Append("'");
sql.Append(((NpgsqlTypes.NpgsqlTimeStamp)value).ToString());
sql.Append("'");
}
private void AppendValue(DateTimeOffset value, StringBuilder sql)
{
sql.Append("'");
sql.Append(((NpgsqlTypes.NpgsqlTimeStampTZ)value).ToString());
sql.Append("'");
}
private void AppendValue(Guid value, StringBuilder sql)
{
sql.Append("'");
sql.Append(value);
sql.Append("'");
}
private void AppendValue(string value, StringBuilder sql)
{
sql.Append("'");
sql.Append(value);
sql.Append("'");
}
private void AppendValue(TimeSpan value, StringBuilder sql)
{
sql.Append("'");
sql.Append(new NpgsqlTypes.NpgsqlInterval(value).ToString());
sql.Append("'");
}
private void AppendValue(DbGeometry value, StringBuilder sql)
{
sql.Append("'");
sql.Append(value);
sql.Append("'");
}
private void AppendValue(object value, StringBuilder sql)
{
if (value is byte[])
{
AppendValue((byte[])value, sql);
}
else if (value is bool)
{
AppendValue((bool)value, sql);
}
else if (value is DateTime)
{
AppendValue((DateTime)value, sql);
}
else if (value is DateTimeOffset)
{
AppendValue((DateTimeOffset)value, sql);
}
else if (value is Guid)
{
AppendValue((Guid)value, sql);
}
else if (value is string)
{
AppendValue((string)value, sql);
}
else if (value is TimeSpan)
{
AppendValue((TimeSpan)value, sql);
}
else if (value is DbGeometry)
{
AppendValue((DbGeometry)value, sql);
}
else
{
sql.Append(string.Format(CultureInfo.InvariantCulture, "{0}", value));
}
}
#endregion
}
}