Radarr/Migrator.net/Migrator.Providers/TransformationProvider.cs

882 lines
32 KiB
C#

#region License
//The contents of this file are subject to the Mozilla Public License
//Version 1.1 (the "License"); you may not use this file except in
//compliance with the License. You may obtain a copy of the License at
//http://www.mozilla.org/MPL/
//Software distributed under the License is distributed on an "AS IS"
//basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
//License for the specific language governing rights and limitations
//under the License.
#endregion
using System;
using System.Collections.Generic;
using System.Data;
using Migrator.Framework;
using Migrator.Framework.SchemaBuilder;
using ForeignKeyConstraint = Migrator.Framework.ForeignKeyConstraint;
using Migrator.Framework.Loggers;
namespace Migrator.Providers
{
/// <summary>
/// Base class for every transformation providers.
/// A 'tranformation' is an operation that modifies the database.
/// </summary>
public abstract class TransformationProvider : ITransformationProvider
{
private ILogger _logger;
protected IDbConnection _connection;
private IDbTransaction _transaction;
private List<long> _appliedMigrations;
protected readonly string _connectionString;
protected Dialect _dialect;
private readonly ForeignKeyConstraintMapper constraintMapper = new ForeignKeyConstraintMapper();
protected TransformationProvider(Dialect dialect, string connectionString)
{
_dialect = dialect;
_connectionString = connectionString;
_logger = new Logger(false);
}
/// <summary>
/// Returns the event logger
/// </summary>
public virtual ILogger Logger
{
get { return _logger; }
set { _logger = value; }
}
public Dialect Dialect
{
get { return _dialect; }
}
public ITransformationProvider this[string provider]
{
get
{
if (null != provider && IsThisProvider(provider))
return this;
return NoOpTransformationProvider.Instance;
}
}
public bool IsThisProvider(string provider)
{
// XXX: This might need to be more sophisticated. Currently just a convention
return GetType().Name.ToLower().StartsWith(provider.ToLower());
}
public virtual Column[] GetColumns(string table)
{
List<Column> columns = new List<Column>();
using (
IDataReader reader =
ExecuteQuery(
String.Format("select COLUMN_NAME, IS_NULLABLE from information_schema.columns where table_name = '{0}'", table)))
{
while (reader.Read())
{
Column column = new Column(reader.GetString(0), DbType.String);
string nullableStr = reader.GetString(1);
bool isNullable = nullableStr == "YES";
column.ColumnProperty |= isNullable ? ColumnProperty.Null : ColumnProperty.NotNull;
columns.Add(column);
}
}
return columns.ToArray();
}
public virtual Column GetColumnByName(string table, string columnName)
{
return Array.Find(GetColumns(table),
delegate(Column column)
{
return column.Name == columnName;
});
}
public virtual string[] GetTables()
{
List<string> tables = new List<string>();
using (IDataReader reader = ExecuteQuery("SELECT table_name FROM information_schema.tables"))
{
while (reader.Read())
{
tables.Add((string)reader[0]);
}
}
return tables.ToArray();
}
public virtual void RemoveForeignKey(string table, string name)
{
RemoveConstraint(table, name);
}
public virtual void RemoveConstraint(string table, string name)
{
if (TableExists(table) && ConstraintExists(table, name))
{
table = _dialect.TableNameNeedsQuote ? _dialect.Quote(table) : table;
name = _dialect.ConstraintNameNeedsQuote ? _dialect.Quote(name) : name;
ExecuteNonQuery(String.Format("ALTER TABLE {0} DROP CONSTRAINT {1}", table, name));
}
}
public void RemoveIndex(string table, string name)
{
throw new NotImplementedException();
}
public virtual void AddTable(string table, string engine, string columns)
{
table = _dialect.TableNameNeedsQuote ? _dialect.Quote(table) : table;
string sqlCreate = String.Format("CREATE TABLE {0} ({1})", table, columns);
ExecuteNonQuery(sqlCreate);
}
/// <summary>
/// Add a new table
/// </summary>
/// <param name="name">Table name</param>
/// <param name="columns">Columns</param>
/// <example>
/// Adds the Test table with two columns:
/// <code>
/// Database.AddTable("Test",
/// new Column("Id", typeof(int), ColumnProperty.PrimaryKey),
/// new Column("Title", typeof(string), 100)
/// );
/// </code>
/// </example>
public virtual void AddTable(string name, params Column[] columns)
{
// Most databases don't have the concept of a storage engine, so default is to not use it.
AddTable(name, null, columns);
}
/// <summary>
/// Add a new table
/// </summary>
/// <param name="name">Table name</param>
/// <param name="columns">Columns</param>
/// <param name="engine">the database storage engine to use</param>
/// <example>
/// Adds the Test table with two columns:
/// <code>
/// Database.AddTable("Test", "INNODB",
/// new Column("Id", typeof(int), ColumnProperty.PrimaryKey),
/// new Column("Title", typeof(string), 100)
/// );
/// </code>
/// </example>
public virtual void AddTable(string name, string engine, params Column[] columns)
{
if (TableExists(name))
{
Logger.Warn("Table {0} already exists", name);
return;
}
List<string> pks = GetPrimaryKeys(columns);
bool compoundPrimaryKey = pks.Count > 1;
List<ColumnPropertiesMapper> columnProviders = new List<ColumnPropertiesMapper>(columns.Length);
foreach (Column column in columns)
{
// Remove the primary key notation if compound primary key because we'll add it back later
if (compoundPrimaryKey && column.IsPrimaryKey)
column.ColumnProperty = ColumnProperty.Unsigned | ColumnProperty.NotNull;
ColumnPropertiesMapper mapper = _dialect.GetAndMapColumnProperties(column);
columnProviders.Add(mapper);
}
string columnsAndIndexes = JoinColumnsAndIndexes(columnProviders);
AddTable(name, engine, columnsAndIndexes);
if (compoundPrimaryKey)
{
AddPrimaryKey(String.Format("PK_{0}", name), name, pks.ToArray());
}
}
public List<string> GetPrimaryKeys(IEnumerable<Column> columns)
{
List<string> pks = new List<string>();
foreach (Column col in columns)
{
if (col.IsPrimaryKey)
pks.Add(col.Name);
}
return pks;
}
public virtual void RemoveTable(string name)
{
if (TableExists(name))
ExecuteNonQuery(String.Format("DROP TABLE {0}", name));
}
public virtual void RenameTable(string oldName, string newName)
{
if (TableExists(newName))
throw new MigrationException(String.Format("Table with name '{0}' already exists", newName));
if (TableExists(oldName))
ExecuteNonQuery(String.Format("ALTER TABLE {0} RENAME TO {1}", oldName, newName));
}
public virtual void RenameColumn(string tableName, string oldColumnName, string newColumnName)
{
if (ColumnExists(tableName, newColumnName))
throw new MigrationException(String.Format("Table '{0}' has column named '{1}' already", tableName, newColumnName));
if (ColumnExists(tableName, oldColumnName))
ExecuteNonQuery(String.Format("ALTER TABLE {0} RENAME COLUMN {1} TO {2}", tableName, oldColumnName, newColumnName));
}
public virtual void AddColumn(string table, string sqlColumn)
{
ExecuteNonQuery(String.Format("ALTER TABLE {0} ADD COLUMN {1}", table, sqlColumn));
}
public virtual void RemoveColumn(string table, string column)
{
if (ColumnExists(table, column))
{
ExecuteNonQuery(String.Format("ALTER TABLE {0} DROP COLUMN {1} ", table, column));
}
}
public virtual bool ColumnExists(string table, string column)
{
try
{
ExecuteNonQuery(String.Format("SELECT {0} FROM {1}", column, table));
return true;
}
catch (Exception)
{
return false;
}
}
public virtual void ChangeColumn(string table, Column column)
{
if (!ColumnExists(table, column.Name))
{
Logger.Warn("Column {0}.{1} does not exist", table, column.Name);
return;
}
ColumnPropertiesMapper mapper = _dialect.GetAndMapColumnProperties(column);
ChangeColumn(table, mapper.ColumnSql);
}
public virtual void ChangeColumn(string table, string sqlColumn)
{
ExecuteNonQuery(String.Format("ALTER TABLE {0} ALTER COLUMN {1}", table, sqlColumn));
}
public virtual bool TableExists(string table)
{
try
{
ExecuteNonQuery("SELECT COUNT(*) FROM " + table);
return true;
}
catch (Exception)
{
return false;
}
}
protected virtual string JoinColumnsAndIndexes(IEnumerable<ColumnPropertiesMapper> columns)
{
string indexes = JoinIndexes(columns);
string columnsAndIndexes = JoinColumns(columns) + (indexes != null ? "," + indexes : String.Empty);
return columnsAndIndexes;
}
protected virtual string JoinIndexes(IEnumerable<ColumnPropertiesMapper> columns)
{
List<string> indexes = new List<string>();
foreach (ColumnPropertiesMapper column in columns)
{
string indexSql = column.IndexSql;
if (indexSql != null)
indexes.Add(indexSql);
}
if (indexes.Count == 0)
return null;
return String.Join(", ", indexes.ToArray());
}
protected virtual string JoinColumns(IEnumerable<ColumnPropertiesMapper> columns)
{
List<string> columnStrings = new List<string>();
foreach (ColumnPropertiesMapper column in columns)
columnStrings.Add(column.ColumnSql);
return String.Join(", ", columnStrings.ToArray());
}
/// <summary>
/// Add a new column to an existing table.
/// </summary>
/// <param name="table">Table to which to add the column</param>
/// <param name="column">Column name</param>
/// <param name="type">Date type of the column</param>
/// <param name="size">Max length of the column</param>
/// <param name="property">Properties of the column, see <see cref="ColumnProperty">ColumnProperty</see>,</param>
/// <param name="defaultValue">Default value</param>
public virtual void AddColumn(string table, string column, DbType type, int size, ColumnProperty property,
object defaultValue)
{
if (ColumnExists(table, column))
{
Logger.Warn("Column {0}.{1} already exists", table, column);
return;
}
ColumnPropertiesMapper mapper =
_dialect.GetAndMapColumnProperties(new Column(column, type, size, property, defaultValue));
AddColumn(table, mapper.ColumnSql);
}
/// <summary>
/// <see cref="TransformationProvider.AddColumn(string, string, DbType, int, ColumnProperty, object)">
/// AddColumn(string, string, Type, int, ColumnProperty, object)
/// </see>
/// </summary>
public virtual void AddColumn(string table, string column, DbType type)
{
AddColumn(table, column, type, 0, ColumnProperty.Null, null);
}
/// <summary>
/// <see cref="TransformationProvider.AddColumn(string, string, DbType, int, ColumnProperty, object)">
/// AddColumn(string, string, Type, int, ColumnProperty, object)
/// </see>
/// </summary>
public virtual void AddColumn(string table, string column, DbType type, int size)
{
AddColumn(table, column, type, size, ColumnProperty.Null, null);
}
public void AddColumn(string table, string column, DbType type, object defaultValue)
{
if (ColumnExists(table, column))
{
Logger.Warn("Column {0}.{1} already exists", table, column);
return;
}
ColumnPropertiesMapper mapper =
_dialect.GetAndMapColumnProperties(new Column(column, type, defaultValue));
AddColumn(table, mapper.ColumnSql);
}
/// <summary>
/// <see cref="TransformationProvider.AddColumn(string, string, DbType, int, ColumnProperty, object)">
/// AddColumn(string, string, Type, int, ColumnProperty, object)
/// </see>
/// </summary>
public virtual void AddColumn(string table, string column, DbType type, ColumnProperty property)
{
AddColumn(table, column, type, 0, property, null);
}
/// <summary>
/// <see cref="TransformationProvider.AddColumn(string, string, DbType, int, ColumnProperty, object)">
/// AddColumn(string, string, Type, int, ColumnProperty, object)
/// </see>
/// </summary>
public virtual void AddColumn(string table, string column, DbType type, int size, ColumnProperty property)
{
AddColumn(table, column, type, size, property, null);
}
public void AddIndex(string name, string table, bool unique, params string[] columns)
{
try
{
var uniqueText = "";
if (unique) uniqueText = "UNIQUE";
var command = String.Format("CREATE {0} INDEX {1} ON {2} ({3})", uniqueText, name, table, String.Join(",", columns));
ExecuteNonQuery(command);
}
catch (Exception e)
{
Logger.Exception("Unable to add index", e);
}
}
/// <summary>
/// Append a primary key to a table.
/// </summary>
/// <param name="name">Constraint name</param>
/// <param name="table">Table name</param>
/// <param name="columns">Primary column names</param>
public virtual void AddPrimaryKey(string name, string table, params string[] columns)
{
if (ConstraintExists(table, name))
{
Logger.Warn("Primary key {0} already exists", name);
return;
}
ExecuteNonQuery(
String.Format("ALTER TABLE {0} ADD CONSTRAINT {1} PRIMARY KEY ({2}) ", table, name,
String.Join(",", columns)));
}
public virtual void AddUniqueConstraint(string name, string table, params string[] columns)
{
if (ConstraintExists(table, name))
{
Logger.Warn("Constraint {0} already exists", name);
return;
}
ExecuteNonQuery(String.Format("ALTER TABLE {0} ADD CONSTRAINT {1} UNIQUE({2}) ", table, name, string.Join(", ", columns)));
}
public virtual void AddCheckConstraint(string name, string table, string checkSql)
{
if (ConstraintExists(table, name))
{
Logger.Warn("Constraint {0} already exists", name);
return;
}
ExecuteNonQuery(String.Format("ALTER TABLE {0} ADD CONSTRAINT {1} CHECK ({2}) ", table, name, checkSql));
}
/// <summary>
/// Guesses the name of the foreign key and add it
/// </summary>
public virtual void GenerateForeignKey(string primaryTable, string primaryColumn, string refTable, string refColumn)
{
AddForeignKey("FK_" + primaryTable + "_" + refTable, primaryTable, primaryColumn, refTable, refColumn);
}
/// <summary>
/// Guesses the name of the foreign key and add it
/// </see>
/// </summary>
public virtual void GenerateForeignKey(string primaryTable, string[] primaryColumns, string refTable,
string[] refColumns)
{
AddForeignKey("FK_" + primaryTable + "_" + refTable, primaryTable, primaryColumns, refTable, refColumns);
}
/// <summary>
/// Guesses the name of the foreign key and add it
/// </summary>
public virtual void GenerateForeignKey(string primaryTable, string primaryColumn, string refTable,
string refColumn, ForeignKeyConstraint constraint)
{
AddForeignKey("FK_" + primaryTable + "_" + refTable, primaryTable, primaryColumn, refTable, refColumn,
constraint);
}
/// <summary>
/// Guesses the name of the foreign key and add it
/// </see>
/// </summary>
public virtual void GenerateForeignKey(string primaryTable, string[] primaryColumns, string refTable,
string[] refColumns, ForeignKeyConstraint constraint)
{
AddForeignKey("FK_" + primaryTable + "_" + refTable, primaryTable, primaryColumns, refTable, refColumns,
constraint);
}
/// <summary>
/// Append a foreign key (relation) between two tables.
/// tables.
/// </summary>
/// <param name="name">Constraint name</param>
/// <param name="primaryTable">Table name containing the primary key</param>
/// <param name="primaryColumn">Primary key column name</param>
/// <param name="refTable">Foreign table name</param>
/// <param name="refColumn">Foreign column name</param>
public virtual void AddForeignKey(string name, string primaryTable, string primaryColumn, string refTable,
string refColumn)
{
AddForeignKey(name, primaryTable, new string[] { primaryColumn }, refTable, new string[] { refColumn });
}
/// <summary>
/// <see cref="ITransformationProvider.AddForeignKey(string, string, string, string, string)">
/// AddForeignKey(string, string, string, string, string)
/// </see>
/// </summary>
public virtual void AddForeignKey(string name, string primaryTable, string[] primaryColumns, string refTable, string[] refColumns)
{
AddForeignKey(name, primaryTable, primaryColumns, refTable, refColumns, ForeignKeyConstraint.NoAction);
}
public virtual void AddForeignKey(string name, string primaryTable, string primaryColumn, string refTable, string refColumn, ForeignKeyConstraint constraint)
{
AddForeignKey(name, primaryTable, new string[] { primaryColumn }, refTable, new string[] { refColumn },
constraint);
}
public virtual void AddForeignKey(string name, string primaryTable, string[] primaryColumns, string refTable,
string[] refColumns, ForeignKeyConstraint constraint)
{
if (ConstraintExists(primaryTable, name))
{
Logger.Warn("Constraint {0} already exists", name);
return;
}
string constraintResolved = constraintMapper.SqlForConstraint(constraint);
ExecuteNonQuery(
String.Format(
"ALTER TABLE {0} ADD CONSTRAINT {1} FOREIGN KEY ({2}) REFERENCES {3} ({4}) ON UPDATE {5} ON DELETE {6}",
primaryTable, name, String.Join(",", primaryColumns),
refTable, String.Join(",", refColumns), constraintResolved, constraintResolved));
}
/// <summary>
/// Determines if a constraint exists.
/// </summary>
/// <param name="name">Constraint name</param>
/// <param name="table">Table owning the constraint</param>
/// <returns><c>true</c> if the constraint exists.</returns>
public abstract bool ConstraintExists(string table, string name);
public virtual bool PrimaryKeyExists(string table, string name)
{
return ConstraintExists(table, name);
}
public int ExecuteNonQuery(string sql)
{
Logger.Trace(sql);
Logger.ApplyingDBChange(sql);
using (IDbCommand cmd = BuildCommand(sql))
{
try
{
return cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
Logger.Warn(ex.Message);
throw;
}
}
}
private IDbCommand BuildCommand(string sql)
{
IDbCommand cmd = _connection.CreateCommand();
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
if (_transaction != null)
{
cmd.Transaction = _transaction;
}
return cmd;
}
/// <summary>
/// Execute an SQL query returning results.
/// </summary>
/// <param name="sql">The SQL command.</param>
/// <returns>A data iterator, <see cref="System.Data.IDataReader">IDataReader</see>.</returns>
public IDataReader ExecuteQuery(string sql)
{
Logger.Trace(sql);
using (IDbCommand cmd = BuildCommand(sql))
{
try
{
return cmd.ExecuteReader();
}
catch
{
Logger.Warn("query failed: {0}", cmd.CommandText);
throw;
}
}
}
public object ExecuteScalar(string sql)
{
Logger.Trace(sql);
using (IDbCommand cmd = BuildCommand(sql))
{
try
{
return cmd.ExecuteScalar();
}
catch
{
Logger.Warn("Query failed: {0}", cmd.CommandText);
throw;
}
}
}
public IDataReader Select(string what, string from)
{
return Select(what, from, "1=1");
}
public virtual IDataReader Select(string what, string from, string where)
{
return ExecuteQuery(String.Format("SELECT {0} FROM {1} WHERE {2}", what, from, where));
}
public object SelectScalar(string what, string from)
{
return SelectScalar(what, from, "1=1");
}
public virtual object SelectScalar(string what, string from, string where)
{
return ExecuteScalar(String.Format("SELECT {0} FROM {1} WHERE {2}", what, from, where));
}
public virtual int Update(string table, string[] columns, string[] values)
{
return Update(table, columns, values, null);
}
public virtual int Update(string table, string[] columns, string[] values, string where)
{
string namesAndValues = JoinColumnsAndValues(columns, values);
string query = "UPDATE {0} SET {1}";
if (!String.IsNullOrEmpty(where))
{
query += " WHERE " + where;
}
return ExecuteNonQuery(String.Format(query, table, namesAndValues));
}
public virtual int Insert(string table, string[] columns, string[] values)
{
return ExecuteNonQuery(String.Format("INSERT INTO {0} ({1}) VALUES ({2})", table, String.Join(", ", columns), String.Join(", ", QuoteValues(values))));
}
public virtual int Delete(string table)
{
return Delete(table, (string[])null, (string[])null);
}
public virtual int Delete(string table, string[] columns, string[] values)
{
if (null == columns || null == values)
{
return ExecuteNonQuery(String.Format("DELETE FROM {0}", table));
}
else
{
return ExecuteNonQuery(String.Format("DELETE FROM {0} WHERE ({1})", table, JoinColumnsAndValues(columns, values)));
}
}
public virtual int Delete(string table, string wherecolumn, string wherevalue)
{
return ExecuteNonQuery(String.Format("DELETE FROM {0} WHERE {1} = {2}", table, wherecolumn, QuoteValues(wherevalue)));
}
/// <summary>
/// Starts a transaction. Called by the migration mediator.
/// </summary>
public void BeginTransaction()
{
if (_transaction == null && _connection != null)
{
EnsureHasConnection();
_transaction = _connection.BeginTransaction(IsolationLevel.ReadCommitted);
}
}
protected void EnsureHasConnection()
{
if (_connection.State != ConnectionState.Open)
{
_connection.Open();
}
}
/// <summary>
/// Rollback the current migration. Called by the migration mediator.
/// </summary>
public virtual void Rollback()
{
if (_transaction != null && _connection != null && _connection.State == ConnectionState.Open)
{
try
{
_transaction.Rollback();
}
finally
{
_connection.Close();
}
}
_transaction = null;
}
/// <summary>
/// Commit the current transaction. Called by the migrations mediator.
/// </summary>
public void Commit()
{
if (_transaction != null && _connection != null && _connection.State == ConnectionState.Open)
{
try
{
_transaction.Commit();
}
finally
{
_connection.Close();
}
}
_transaction = null;
}
/// <summary>
/// The list of Migrations currently applied to the database.
/// </summary>
public List<long> AppliedMigrations
{
get
{
if (_appliedMigrations == null)
{
_appliedMigrations = new List<long>();
CreateSchemaInfoTable();
using (IDataReader reader = Select("version", "SchemaInfo"))
{
while (reader.Read())
{
_appliedMigrations.Add(Convert.ToInt64(reader.GetValue(0)));
}
}
}
return _appliedMigrations;
}
}
/// <summary>
/// Marks a Migration version number as having been applied
/// </summary>
/// <param name="version">The version number of the migration that was applied</param>
public void MigrationApplied(long version)
{
CreateSchemaInfoTable();
Insert("SchemaInfo", new string[] { "version" }, new string[] { version.ToString() });
_appliedMigrations.Add(version);
}
/// <summary>
/// Marks a Migration version number as having been rolled back from the database
/// </summary>
/// <param name="version">The version number of the migration that was removed</param>
public void MigrationUnApplied(long version)
{
CreateSchemaInfoTable();
Delete("SchemaInfo", "version", version.ToString());
_appliedMigrations.Remove(version);
}
protected void CreateSchemaInfoTable()
{
EnsureHasConnection();
if (!TableExists("SchemaInfo"))
{
AddTable("SchemaInfo", new Column("Version", DbType.Int64, ColumnProperty.PrimaryKey));
}
}
public void AddColumn(string table, Column column)
{
AddColumn(table, column.Name, column.Type, column.Size, column.ColumnProperty, column.DefaultValue);
}
public void GenerateForeignKey(string primaryTable, string refTable)
{
GenerateForeignKey(primaryTable, refTable, ForeignKeyConstraint.NoAction);
}
public void GenerateForeignKey(string primaryTable, string refTable, ForeignKeyConstraint constraint)
{
GenerateForeignKey(primaryTable, refTable + "Id", refTable, "Id", constraint);
}
public IDbCommand GetCommand()
{
return BuildCommand(null);
}
public void ExecuteSchemaBuilder(SchemaBuilder builder)
{
foreach (ISchemaBuilderExpression expr in builder.Expressions)
expr.Create(this);
}
public virtual string QuoteValues(string values)
{
return QuoteValues(new string[] { values })[0];
}
public virtual string[] QuoteValues(string[] values)
{
return Array.ConvertAll<string, string>(values,
delegate(string val)
{
if (null == val)
return "null";
else
return String.Format("'{0}'", val.Replace("'", "''"));
});
}
public string JoinColumnsAndValues(string[] columns, string[] values)
{
string[] quotedValues = QuoteValues(values);
string[] namesAndValues = new string[columns.Length];
for (int i = 0; i < columns.Length; i++)
{
namesAndValues[i] = String.Format("{0}={1}", columns[i], quotedValues[i]);
}
return String.Join(", ", namesAndValues);
}
public void Dispose()
{
if (_connection != null && _connection.State == ConnectionState.Open)
{
_connection.Close();
}
}
}
}