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/* ****************************************************************************
*
* Copyright (c) Jeff Hardy 2010-2012.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Threading;
using Community.CsharpSqlite;
using IronPython.Runtime;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
using sqlite3_stmt = Community.CsharpSqlite.Sqlite3.Vdbe;
using sqlite3_value = Community.CsharpSqlite.Sqlite3.Mem;
namespace IronPython.SQLite
{
public static partial class PythonSQLite
{
[PythonType]
public class Connection
{
public bool autocommit = false;
public int total_changes { get { return Sqlite3.sqlite3_total_changes(this.db); } }
public int detect_types { get; set; }
public bool check_same_thread { get; set; }
private double _timeout;
public double timeout
{
get { return _timeout; }
set { _timeout = value; Sqlite3.sqlite3_busy_timeout(this.db, (int)(_timeout * 1000)); }
}
private string _isolation_level;
public string isolation_level
{
get { return _isolation_level; }
set { setIsolationLevel(value); }
}
public string begin_statement { get; private set; }
public object row_factory { get; set; }
public object text_factory { get; set; }
public IDictionary collations = new PythonDictionary();
private List<WeakReference> statements = new List<WeakReference>();
private int created_statements = 0;
private Dictionary<object, object> function_pinboard = new Dictionary<object, object>();
internal Sqlite3.sqlite3 db;
internal bool inTransaction = false;
internal int thread_ident = Thread.CurrentThread.ManagedThreadId;
private static readonly Dictionary<object, object> emptyKwargs= new Dictionary<object, object>();
public PythonType Warning = PythonSQLite.Warning;
public PythonType Error = PythonSQLite.Error;
public PythonType InterfaceError = PythonSQLite.InterfaceError;
public PythonType DataError = PythonSQLite.DataError;
public PythonType DatabaseError = PythonSQLite.DatabaseError;
public PythonType OperationalError = PythonSQLite.OperationalError;
public PythonType InternalError = PythonSQLite.InternalError;
public PythonType IntegrityError = PythonSQLite.IntegrityError;
public PythonType ProgrammingError = PythonSQLite.ProgrammingError;
public PythonType NotSupportedError = PythonSQLite.NotSupportedError;
private enum AllStatmentsAction
{
Reset, Finalize
}
public Connection(string database,
[Optional][DefaultParameterValue(0.0)]double timeout,
[Optional][DefaultParameterValue(0)]int detect_types,
[Optional][DefaultParameterValue((string)null)]string isolation_level,
[Optional][DefaultParameterValue(true)]bool check_same_thread,
[Optional][DefaultParameterValue(null)]object factory,
[Optional][DefaultParameterValue(0)]int cached_statements)
{
this.text_factory = typeof(string);
int rc = Sqlite3.sqlite3_open(database, out this.db);
if(rc != Sqlite3.SQLITE_OK)
throw GetSqliteError(this.db, null);
setIsolationLevel(isolation_level ?? "");
this.detect_types = detect_types;
this.timeout = timeout;
this.check_same_thread = check_same_thread;
}
~Connection()
{
if(this.db != null)
Sqlite3.sqlite3_close(this.db);
}
[Documentation("Closes the connection.")]
public void close()
{
checkThread();
doAllStatements(AllStatmentsAction.Finalize);
if(this.db != null)
{
int rc = Sqlite3.SQLITE_OK, i = 0;
do
{
rc = Sqlite3.sqlite3_close(this.db);
if(rc == Sqlite3.SQLITE_BUSY)
{
GC.Collect();
GC.WaitForPendingFinalizers();
}
} while(rc == Sqlite3.SQLITE_BUSY && i++ < 3);
if(rc != Sqlite3.SQLITE_OK)
throw GetSqliteError(this.db, null);
this.db = null;
}
}
internal void begin()
{
sqlite3_stmt statement = null;
string tail = null;
int rc = Sqlite3.sqlite3_prepare(this.db, this.begin_statement, -1, ref statement, ref tail);
if(rc != Sqlite3.SQLITE_OK)
throw GetSqliteError(this.db, statement);
rc = Util.Step(statement);
if(rc == Sqlite3.SQLITE_DONE)
this.inTransaction = true;
else
throw GetSqliteError(this.db, statement);
rc = Sqlite3.sqlite3_finalize(statement);
if(rc != Sqlite3.SQLITE_OK)
GetSqliteError(this.db, null);
}
[Documentation("Commit the current transaction.")]
public void commit()
{
checkThread(); checkConnection();
if(inTransaction)
{
sqlite3_stmt statement = null;
string tail = null;
int rc = Sqlite3.sqlite3_prepare(this.db, "COMMIT", -1, ref statement, ref tail);
if(rc != Sqlite3.SQLITE_OK)
throw GetSqliteError(this.db, null);
rc = Util.Step(statement);
if(rc == Sqlite3.SQLITE_DONE)
this.inTransaction = false;
else
throw GetSqliteError(this.db, statement);
rc = Sqlite3.sqlite3_finalize(statement);
if(rc != Sqlite3.SQLITE_OK)
GetSqliteError(this.db, null);
}
}
[Documentation("Roll back the current transaction.")]
public void rollback()
{
checkThread(); checkConnection();
if(inTransaction)
{
doAllStatements(AllStatmentsAction.Reset);
sqlite3_stmt statement = null;
string tail = null;
int rc = Sqlite3.sqlite3_prepare(this.db, "ROLLBACK", -1, ref statement, ref tail);
if(rc != Sqlite3.SQLITE_OK)
throw GetSqliteError(this.db, null);
rc = Util.Step(statement);
if(rc == Sqlite3.SQLITE_DONE)
this.inTransaction = false;
else
throw GetSqliteError(this.db, statement);
rc = Sqlite3.sqlite3_finalize(statement);
if(rc != Sqlite3.SQLITE_OK)
GetSqliteError(this.db, null);
}
}
[Documentation("Return a cursor for the connection.")]
public object cursor(CodeContext context, [Optional][DefaultParameterValue(null)]object factory)
{
checkThread(); checkConnection();
object cursor = factory == null ? new Cursor(context, this) : PythonCalls.Call(context, factory, this);
if(this.row_factory != null)
context.LanguageContext.Operations.SetMember(cursor, "row_factory", this.row_factory);
return cursor;
}
[Documentation("Executes a SQL statement. Non-standard.")]
public object execute(CodeContext context, [ParamDictionary]IDictionary<object, object> kwargs, params object[] args)
{
object c = cursor(context, null);
object execute = context.LanguageContext.Operations.GetMember(c, "execute");
return PythonCalls.CallWithKeywordArgs(context, execute, args, kwargs);
}
[Documentation("Repeatedly executes a SQL statement. Non-standard.")]
public object executemany(CodeContext context, [ParamDictionary]IDictionary<object, object> kwargs, params object[] args)
{
object c = cursor(context, null);
object executemany = context.LanguageContext.Operations.GetMember(c, "executemany");
return PythonCalls.CallWithKeywordArgs(context, executemany, args, kwargs);
}
[Documentation("Executes a multiple SQL statements at once. Non-standard.")]
public object executescript(CodeContext context, [ParamDictionary]IDictionary<object, object> kwargs, params object[] args)
{
object c = cursor(context, null);
object executescript = context.LanguageContext.Operations.GetMember(c, "executescript");
return PythonCalls.CallWithKeywordArgs(context, executescript, args, kwargs);
}
public object __call__(string sql)
{
dropUnusedStatementReferences();
Statement statement = new Statement(this, sql);
this.statements.Add(new WeakReference(statement));
return statement;
}
private void dropUnusedStatementReferences()
{
if(this.created_statements++ < 200)
return;
this.created_statements = 0;
List<WeakReference> new_list = new List<WeakReference>();
foreach(WeakReference weakref in this.statements)
if(weakref.IsAlive)
new_list.Add(weakref);
this.statements = new_list;
}
#region User functions
[Documentation("Creates a new function. Non-standard.")]
public void create_function(CodeContext context, string name, int narg, object func)
{
int rc = Sqlite3.sqlite3_create_function(this.db,
name, narg,
Sqlite3.SQLITE_ANY,
new object[] { context, func },
callUserFunction,
null, null);
if(rc != Sqlite3.SQLITE_OK)
throw MakeOperationalError("Error creating function");
else
this.function_pinboard[func] = null;
}
private static void callUserFunction(Sqlite3.sqlite3_context ctx, int argc, sqlite3_value[] argv)
{
object[] data = (object[])Sqlite3.sqlite3_user_data(ctx);
CodeContext context = (CodeContext)data[0];
object func = data[1];
object[] args = buildPyParams(context, ctx, argc, argv);
try
{
object result = PythonCalls.CallWithKeywordArgs(context, func, args, emptyKwargs);
setResult(ctx, result);
}
catch(Exception)
{
Sqlite3.sqlite3_result_error(ctx, "user-defined function raised exception", -1);
}
}
private static object[] buildPyParams(CodeContext context, Sqlite3.sqlite3_context ctx, int argc, sqlite3_value[] argv)
{
object[] args = new object[argc];
for(int i = 0; i < argc; ++i)
{
sqlite3_value cur_value = argv[i];
object cur_py_value = null;
switch(Sqlite3.sqlite3_value_type(cur_value))
{
case Sqlite3.SQLITE_INTEGER:
cur_py_value = (int)Sqlite3.sqlite3_value_int64(cur_value);
break;
case Sqlite3.SQLITE_FLOAT:
cur_py_value = Sqlite3.sqlite3_value_double(cur_value);
break;
case Sqlite3.SQLITE_TEXT:
cur_py_value = Sqlite3.sqlite3_value_text(cur_value);
break;
case Sqlite3.SQLITE_BLOB:
byte[] result = Sqlite3.sqlite3_value_blob(cur_value);
PythonBuffer buffer = new PythonBuffer(context, result);
cur_py_value = buffer;
break;
case Sqlite3.SQLITE_NULL:
default:
cur_py_value = null;
break;
}
args[i] = cur_py_value;
}
return args;
}
private static void setResult(Sqlite3.sqlite3_context ctx, object result)
{
if(result == null)
Sqlite3.sqlite3_result_null(ctx);
else if(result is bool)
Sqlite3.sqlite3_result_int64(ctx, ((bool)result) ? 1 : 0);
else if(result is int)
Sqlite3.sqlite3_result_int64(ctx, (int)result);
else if(result is long)
Sqlite3.sqlite3_result_int64(ctx, (long)result);
else if(result is Microsoft.Scripting.Math.BigInteger)
Sqlite3.sqlite3_result_int64(ctx, ((Microsoft.Scripting.Math.BigInteger)result).ToInt64());
else if(result is float)
Sqlite3.sqlite3_result_double(ctx, (float)result);
else if(result is double)
Sqlite3.sqlite3_result_double(ctx, (double)result);
else if(result is string)
Sqlite3.sqlite3_result_text(ctx, (string)result, -1, Sqlite3.SQLITE_TRANSIENT);
else if(result is byte[])
{
byte[] b = (byte[])result;
string s = Latin1.GetString(b, 0, b.Length);
Sqlite3.sqlite3_result_blob(ctx, s, s.Length, Sqlite3.SQLITE_TRANSIENT);
}
else if(result is PythonBuffer)
{
PythonBuffer buffer = (PythonBuffer)result;
string s = buffer.__getslice__(0, null).ToString();
Sqlite3.sqlite3_result_blob(ctx, s, s.Length, Sqlite3.SQLITE_TRANSIENT);
}
else
{
// TODO raise error
}
}
#endregion
#region User aggregates
private class UserAggregateThunk
{
public UserAggregateThunk(CodeContext context, string name, object aggregate_class)
{
this.context = context;
this.aggregate_class = aggregate_class;
this.name = name;
}
public void stepCallback(Sqlite3.sqlite3_context ctx, int argc, sqlite3_value[] param)
{
if(instance == null)
{
try
{
instance = PythonCalls.Call(context, aggregate_class);
}
catch(Exception)
{
Sqlite3.sqlite3_result_error(ctx, "user-defined aggregate's '__init__' method raised error", -1);
return;
}
}
try
{
object step = context.LanguageContext.Operations.GetMember(instance, "step");
object[] args = buildPyParams(context, ctx, argc, param);
PythonCalls.CallWithKeywordArgs(context, step, args, new Dictionary<object, object>());
}
catch(Exception e)
{
if(e is MissingMemberException)
throw;
Sqlite3.sqlite3_result_error(ctx, "user-defined aggregate's 'step' method raised error", -1);
}
}
public void finalCallback(Sqlite3.sqlite3_context ctx)
{
if(instance == null)
return;
try
{
object function_result = context.LanguageContext.Operations.InvokeMember(instance, "finalize");
setResult(ctx, function_result);
}
catch(Exception)
{
Sqlite3.sqlite3_result_error(ctx, "user-defined aggregate's 'finalize' method raised error", -1);
}
}
CodeContext context;
string name;
object aggregate_class;
object instance;
}
[Documentation("Creates a new aggregate. Non-standard.")]
public void create_aggregate(CodeContext context, string name, int n_arg, object aggregate_class)
{
UserAggregateThunk thunk = new UserAggregateThunk(context, name, aggregate_class);
int rc = Sqlite3.sqlite3_create_function(this.db,
name, n_arg,
Sqlite3.SQLITE_ANY,
thunk,
null,
thunk.stepCallback,
thunk.finalCallback);
if(rc != Sqlite3.SQLITE_OK)
throw MakeOperationalError("Error creating aggregate");
else
this.function_pinboard[aggregate_class] = null;
}
#endregion
[Documentation("Creates a collation function. Non-standard.")]
public void create_collation(params object[] args)
{
throw new NotImplementedException();
}
[Documentation("Sets progress handler callback. Non-standard.")]
public void set_progress_handler(params object[] args)
{
throw new NotImplementedException();
}
[Documentation("Sets authorizer callback. Non-standard.")]
public void set_authorizer(params object[] args)
{
throw new NotImplementedException();
}
[Documentation("For context manager. Non-standard.")]
public object __enter__()
{
return this;
}
[Documentation("For context manager. Non-standard.")]
public object __exit__(CodeContext context, object exc_type, object exc_value, object exc_tb)
{
DynamicOperations ops = context.LanguageContext.Operations;
if(exc_type == null && exc_value == null && exc_tb == null)
{
object commitfn;
if(ops.TryGetMember(this, "commit", out commitfn))
ops.Invoke(commitfn);
else
commit();
}
else
{
object rollbackfn;
if(ops.TryGetMember(this, "rollback", out rollbackfn))
ops.Invoke(rollbackfn);
else
rollback();
}
return false;
}
public object iterdump(CodeContext context)
{
throw new NotImplementedException("Not supported with C#-sqlite for unknown reasons.");
//var ops = context.LanguageContext.Operations;
//PythonModule sqlite3 = Importer.ImportModule(context, context.GlobalScope, "sqlite3", false, -1) as PythonModule;
//PythonModule dump = Importer.ImportFrom(context, sqlite3, "dump") as PythonModule;
//object _iterdump = ops.GetMember(dump, "_iterdump");
//object result = ops.Invoke(_iterdump, this);
//return result;
}
internal void checkConnection()
{
if(this.db == null)
throw MakeProgrammingError("Cannot operate on a closed database.");
}
internal void checkThread()
{
if(this.check_same_thread)
if(this.thread_ident != System.Threading.Thread.CurrentThread.ManagedThreadId)
throw MakeProgrammingError("SQLite objects created in a thread can only be used in that same thread." +
"The object was created in thread id {0} and this is thread id {1}".Format(
this.thread_ident, System.Threading.Thread.CurrentThread.ManagedThreadId));
}
internal static void verify(Connection connection)
{
verify(connection, false);
}
internal static void verify(Connection connection, bool closed)
{
if(!closed && (connection == null || connection.db == null))
throw MakeProgrammingError("Cannot operate on a closed database.");
connection.checkThread();
}
private void setIsolationLevel(string isolation_level)
{
this.begin_statement = null;
if(isolation_level == null)
{
this._isolation_level = null;
this.commit();
this.inTransaction = false;
}
else
{
this._isolation_level = isolation_level;
this.begin_statement = "BEGIN " + isolation_level;
}
}
private void doAllStatements(AllStatmentsAction action)
{
foreach(WeakReference weakref in this.statements)
{
if(weakref.IsAlive)
{
Statement statement = weakref.Target as Statement;
if(statement != null)
{
if(action == AllStatmentsAction.Reset)
statement.Reset();
else
statement.SqliteFinalize();
}
}
}
}
}
}
}
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