private void DropAllTables(Schema schema, bool extractCatalogAfterDropping)
{
var batch = SqlDml.Batch();
var foreignKeys = schema.Tables.SelectMany(el => el.TableConstraints.OfType <ForeignKey>());
foreach (var foreignKey in foreignKeys)
{
batch.Add(SqlDdl.Alter(foreignKey.Table, SqlDdl.DropConstraint(foreignKey)));
}
foreach (var view in schema.Views)
{
batch.Add(SqlDdl.Drop(view));
schema.Tables.Remove(schema.Tables[view.Name]);
}
foreach (var table in schema.Tables)
{
batch.Add(SqlDdl.Drop(table));
}
if (batch.Count <= 0)
{
return;
}
var sqlCommand = SqlConnection.CreateCommand();
sqlCommand.CommandText = SqlDriver.Compile(batch).GetCommandText();
sqlCommand.ExecuteNonQuery();
if (extractCatalogAfterDropping)
{
Catalog = SqlDriver.ExtractCatalog(SqlConnection);
}
}
private static void DropForeignKeys(StorageDriver driver, IEnumerable <Table> tables, ISqlExecutor executor)
{
var statements = tables
.SelectMany(t => t.TableConstraints.OfType <ForeignKey>())
.Select(fk => driver.Compile(SqlDdl.Alter(fk.Table, SqlDdl.DropConstraint(fk))).GetCommandText())
.ToList();
executor.ExecuteMany(statements);
}
public void Test159()
{
var t = Catalog.Schemas["Sakila"].Tables["customer"];
Xtensive.Sql.Model.UniqueConstraint uc = t.CreateUniqueConstraint("newUniqueConstraint", t.TableColumns["email"]);
SqlAlterTable stmt = SqlDdl.Alter(t, SqlDdl.DropConstraint(uc));
Console.Write(Compile(stmt));
}
private static Task DropForeignKeysAsync(
StorageDriver driver, IEnumerable <Table> tables, ISqlExecutor executor, CancellationToken token)
{
var statements = tables
.SelectMany(t => t.TableConstraints.OfType <ForeignKey>())
.Select(fk => driver.Compile(SqlDdl.Alter(fk.Table, SqlDdl.DropConstraint(fk))).GetCommandText())
.ToList();
return(executor.ExecuteManyAsync(statements, token));
}
private void DropSchema(Catalog catalog)
{
var schema = catalog.DefaultSchema;
var dropBatch = SqlDml.Batch();
foreach (var constraint in schema.Tables.Where(t => t.TableConstraints.Count != 0).SelectMany(t => t.TableConstraints.OfType <ForeignKey>()))
{
if (dropBatch.Count > 31)
{
ExecuteBatch(dropBatch);
dropBatch = SqlDml.Batch();
}
dropBatch.Add(SqlDdl.Alter(constraint.Table, SqlDdl.DropConstraint(constraint)));
}
foreach (var view in schema.Views)
{
if (dropBatch.Count > 31)
{
ExecuteBatch(dropBatch);
dropBatch = SqlDml.Batch();
}
dropBatch.Add(SqlDdl.Drop(view));
schema.Tables.Remove(schema.Tables[view.Name]);
}
foreach (var schemaTable in schema.Tables)
{
if (dropBatch.Count > 31)
{
ExecuteBatch(dropBatch);
dropBatch = SqlDml.Batch();
}
dropBatch.Add(SqlDdl.Drop(schemaTable));
}
if (dropBatch.Count != 0)
{
ExecuteBatch(dropBatch);
}
}
private void ClearSchema(SqlDriver driver)
{
using (var connection = driver.CreateConnection()) {
connection.Open();
try {
var schema = driver.ExtractSchema(connection, SpecialSchemaAlias);
var foreignKeys = schema.Tables
.Select(t => new {
Table = t,
ForeignKeys = t.TableConstraints.OfType <ForeignKey>()
});
foreach (var dropConstraintText in from foreignKeyInfo in foreignKeys
from foreignKey in foreignKeyInfo.ForeignKeys
select driver.Compile(SqlDdl.Alter(foreignKeyInfo.Table, SqlDdl.DropConstraint(foreignKey))).GetCommandText())
{
using (var command = connection.CreateCommand(dropConstraintText))
command.ExecuteNonQuery();
}
foreach (var table in schema.Tables)
{
var dropTableText = driver.Compile(SqlDdl.Drop(table, true)).GetCommandText();
using (var command = connection.CreateCommand(dropTableText))
command.ExecuteNonQuery();
}
}
finally {
connection.Close();
}
}
}