Implement SqliteCommand.Prepare.

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src/Microsoft.Data.Sqlite.Core/SqliteCommand.cs

@@ -21,6 +21,9 @@ namespace Microsoft.Data.Sqlite
     {
         private readonly Lazy<SqliteParameterCollection> _parameters = new Lazy<SqliteParameterCollection>(
             () => new SqliteParameterCollection());
+        private readonly ICollection<sqlite3_stmt> _preparedStatements = new List<sqlite3_stmt>();
+        private SqliteConnection _connection;
+        private string _commandText;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="SqliteCommand" /> class.
@@ -76,13 +79,38 @@ namespace Microsoft.Data.Sqlite
         /// Gets or sets the SQL to execute against the database.
         /// </summary>
         /// <value>The SQL to execute against the database.</value>
-        public override string CommandText { get; set; }
+        public override string CommandText
+        {
+            get => _commandText;
+            set
+            {
+                if (!value.Equals(_commandText))
+                {
+                    DisposePreparedStatements();
+                    _commandText = value;
+                }
+            }
+        }
 
         /// <summary>
         /// Gets or sets the connection used by the command.
         /// </summary>
         /// <value>The connection used by the command.</value>
-        public new virtual SqliteConnection Connection { get; set; }
+        public new virtual SqliteConnection Connection
+        {
+            get => _connection;
+            set
+            {
+                if (value != _connection)
+                {
+                    DisposePreparedStatements();
+
+                    _connection?.RemoveCommand(this);
+                    _connection = value;
+                    value?.AddCommand(this);
+                }
+            }
+        }
 
         /// <summary>
         /// Gets or sets the connection used by the command. Must be a <see cref="SqliteConnection" />.
@@ -145,6 +173,19 @@ namespace Microsoft.Data.Sqlite
         /// <value>A value indicating how the results are applied to the row being updated.</value>
         public override UpdateRowSource UpdatedRowSource { get; set; }
 
+        /// <summary>
+        /// Releases any resources used by the connection and closes it.
+        /// </summary>
+        /// <param name="disposing">
+        /// true to release managed and unmanaged resources; false to release only unmanaged resources.
+        /// </param>
+        protected override void Dispose(bool disposing)
+        {
+            DisposePreparedStatements();
+
+            base.Dispose(disposing);
+        }
+
         /// <summary>
         /// Creates a new parameter.
         /// </summary>
@@ -164,6 +205,27 @@ namespace Microsoft.Data.Sqlite
         /// </summary>
         public override void Prepare()
         {
+            if (_connection?.State != ConnectionState.Open)
+            {
+                throw new InvalidOperationException(Resources.CallRequiresOpenConnection(nameof(Prepare)));
+            }
+
+            if (string.IsNullOrEmpty(_commandText))
+            {
+                throw new InvalidOperationException(Resources.CallRequiresSetCommandText(nameof(Prepare)));
+            }
+
+            if (_preparedStatements.Count != 0)
+            {
+                return;
+            }
+
+            using (var enumerator = PrepareAndEnumerateStatements().GetEnumerator())
+            {
+                while (enumerator.MoveNext())
+                {
+                }
+            }
         }
 
         /// <summary>
@@ -193,17 +255,17 @@ namespace Microsoft.Data.Sqlite
                 throw new ArgumentException(Resources.InvalidCommandBehavior(behavior));
             }
 
-            if (Connection?.State != ConnectionState.Open)
+            if (_connection?.State != ConnectionState.Open)
             {
                 throw new InvalidOperationException(Resources.CallRequiresOpenConnection(nameof(ExecuteReader)));
             }
 
-            if (string.IsNullOrEmpty(CommandText))
+            if (string.IsNullOrEmpty(_commandText))
             {
                 throw new InvalidOperationException(Resources.CallRequiresSetCommandText(nameof(ExecuteReader)));
             }
 
-            if (Transaction != Connection.Transaction)
+            if (Transaction != _connection.Transaction)
             {
                 throw new InvalidOperationException(
                     Transaction == null
@@ -213,34 +275,16 @@ namespace Microsoft.Data.Sqlite
 
             // This is not a guarantee. SQLITE_BUSY can still be thrown before the command timeout.
             // This sets a timeout handler but this can be cleared by concurrent commands.
-            raw.sqlite3_busy_timeout(Connection.Handle, CommandTimeout * 1000);
+            raw.sqlite3_busy_timeout(_connection.Handle, CommandTimeout * 1000);
 
             var hasChanges = false;
             var changes = 0;
-            var stmts = new Queue<(sqlite3_stmt stmt, bool)>();
-            var tail = CommandText;
+            int rc;
+            var stmts = new Queue<(sqlite3_stmt, bool)>();
 
-            do
-            {
-                var rc = raw.sqlite3_prepare_v2(
-                        Connection.Handle,
-                        tail,
-                        out var stmt,
-                        out tail);
-                SqliteException.ThrowExceptionForRC(rc, Connection.Handle);
-
-                // Statement was empty, white space, or a comment
-                if (stmt.ptr == IntPtr.Zero)
-                {
-                    if (!string.IsNullOrEmpty(tail))
-                    {
-                        continue;
-                    }
-
-                    break;
-                }
-
-                try
+            foreach (var stmt in _preparedStatements.Count == 0
+                ? PrepareAndEnumerateStatements()
+                : ResetAndEnumerateStatements())
             {
                 var boundParams = 0;
 
@@ -282,18 +326,7 @@ namespace Microsoft.Data.Sqlite
                     Thread.Sleep(150);
                 }
 
-                    SqliteException.ThrowExceptionForRC(rc, Connection.Handle);
-                }
-                catch
-                {
-                    stmt.Dispose();
-                    while (stmts.Count != 0)
-                    {
-                        stmts.Dequeue().stmt.Dispose();
-                    }
-
-                    throw;
-                }
+                SqliteException.ThrowExceptionForRC(rc, _connection.Handle);
 
                 if (rc == raw.SQLITE_ROW
                     // NB: This is only a heuristic to separate SELECT statements from INSERT/UPDATE/DELETE statements.
@@ -305,15 +338,13 @@ namespace Microsoft.Data.Sqlite
                 else
                 {
                     hasChanges = true;
-                    changes += raw.sqlite3_changes(Connection.Handle);
-                    stmt.Dispose();
+                    changes += raw.sqlite3_changes(_connection.Handle);
                 }
             }
-            while (!string.IsNullOrEmpty(tail));
 
             var closeConnection = (behavior & CommandBehavior.CloseConnection) != 0;
 
-            return new SqliteDataReader(Connection, stmts, hasChanges ? changes : -1, closeConnection);
+            return new SqliteDataReader(this, stmts, hasChanges ? changes : -1, closeConnection);
         }
 
         /// <summary>
@@ -396,11 +427,11 @@ namespace Microsoft.Data.Sqlite
         /// <exception cref="SqliteException">A SQLite error occurs during execution.</exception>
         public override int ExecuteNonQuery()
         {
-            if (Connection?.State != ConnectionState.Open)
+            if (_connection?.State != ConnectionState.Open)
             {
                 throw new InvalidOperationException(Resources.CallRequiresOpenConnection(nameof(ExecuteNonQuery)));
             }
-            if (CommandText == null)
+            if (_commandText == null)
             {
                 throw new InvalidOperationException(Resources.CallRequiresSetCommandText(nameof(ExecuteNonQuery)));
             }
@@ -418,11 +449,11 @@ namespace Microsoft.Data.Sqlite
         /// <exception cref="SqliteException">A SQLite error occurs during execution.</exception>
         public override object ExecuteScalar()
         {
-            if (Connection?.State != ConnectionState.Open)
+            if (_connection?.State != ConnectionState.Open)
             {
                 throw new InvalidOperationException(Resources.CallRequiresOpenConnection(nameof(ExecuteScalar)));
             }
-            if (CommandText == null)
+            if (_commandText == null)
             {
                 throw new InvalidOperationException(Resources.CallRequiresSetCommandText(nameof(ExecuteScalar)));
             }
@@ -441,5 +472,55 @@ namespace Microsoft.Data.Sqlite
         public override void Cancel()
         {
         }
+
+        private IEnumerable<sqlite3_stmt> PrepareAndEnumerateStatements()
+        {
+            var tail = _commandText;
+            do
+            {
+                var rc = raw.sqlite3_prepare_v2(
+                    _connection.Handle,
+                    tail,
+                    out sqlite3_stmt stmt,
+                    out tail);
+                SqliteException.ThrowExceptionForRC(rc, _connection.Handle);
+
+                // Statement was empty, white space, or a comment
+                if (stmt.ptr == IntPtr.Zero)
+                {
+                    if (!string.IsNullOrEmpty(tail))
+                    {
+                        continue;
+                    }
+
+                    break;
+                }
+
+                _preparedStatements.Add(stmt);
+
+                yield return stmt;
+            }
+            while (!string.IsNullOrEmpty(tail));
+        }
+
+        private IEnumerable<sqlite3_stmt> ResetAndEnumerateStatements()
+        {
+            foreach (var stmt in _preparedStatements)
+            {
+                raw.sqlite3_reset(stmt);
+
+                yield return stmt;
+            }
+        }
+
+        private void DisposePreparedStatements()
+        {
+            foreach (var stmt in _preparedStatements)
+            {
+                stmt.Dispose();
+            }
+
+            _preparedStatements.Clear();
+        }
     }
 }

src/Microsoft.Data.Sqlite.Core/SqliteConnection.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Collections.Generic;
 using System.Data;
 using System.Data.Common;
 using System.Diagnostics;
@@ -19,6 +20,8 @@ namespace Microsoft.Data.Sqlite
     {
         private const string MainDatabaseName = "main";
 
+        private readonly IList<WeakReference<SqliteCommand>> _commands = new List<WeakReference<SqliteCommand>>();
+
         private string _connectionString;
         private ConnectionState _state;
         private sqlite3 _db;
@@ -220,6 +223,17 @@ namespace Microsoft.Data.Sqlite
             }
 
             Transaction?.Dispose();
+
+            foreach (var reference in _commands)
+            {
+                if (reference.TryGetTarget(out var command))
+                {
+                    command.Dispose();
+                }
+            }
+
+            _commands.Clear();
+
             _db.Dispose2();
             _db = null;
             SetState(ConnectionState.Closed);
@@ -265,6 +279,20 @@ namespace Microsoft.Data.Sqlite
         protected override DbCommand CreateDbCommand()
             => CreateCommand();
 
+        internal void AddCommand(SqliteCommand command)
+            => _commands.Add(new WeakReference<SqliteCommand>(command));
+
+        internal void RemoveCommand(SqliteCommand command)
+        {
+            for (int i = _commands.Count - 1; i >= 0; i--)
+            {
+                if (!_commands[i].TryGetTarget(out var item) || item == command)
+                {
+                    _commands.RemoveAt(i);
+                }
+            }
+        }
+
         /// <summary>
         /// Create custom collation.
         /// </summary>

src/Microsoft.Data.Sqlite.Core/SqliteDataReader.cs

@@ -10,6 +10,7 @@ using System.Globalization;
 using System.Text;
 using Microsoft.Data.Sqlite.Properties;
 using SQLitePCL;
+using System.Text;
 
 namespace Microsoft.Data.Sqlite
 {
@@ -20,9 +21,9 @@ namespace Microsoft.Data.Sqlite
     {
         private static readonly byte[] _emptyByteArray = new byte[0];
 
-        private readonly SqliteConnection _connection;
+        private readonly SqliteCommand _command;
         private readonly bool _closeConnection;
-        private readonly Queue<(sqlite3_stmt stmt, bool)> _stmtQueue;
+        private readonly Queue<(sqlite3_stmt, bool)> _stmtQueue;
         private sqlite3_stmt _stmt;
         private bool _hasRows;
         private bool _stepped;
@@ -30,7 +31,7 @@ namespace Microsoft.Data.Sqlite
         private bool _closed;
 
         internal SqliteDataReader(
-            SqliteConnection connection,
+            SqliteCommand command,
             Queue<(sqlite3_stmt, bool)> stmtQueue,
             int recordsAffected,
             bool closeConnection)
@@ -40,7 +41,7 @@ namespace Microsoft.Data.Sqlite
                 (_stmt, _hasRows) = stmtQueue.Dequeue();
             }
 
-            _connection = connection;
+            _command = command;
             _stmtQueue = stmtQueue;
             RecordsAffected = recordsAffected;
             _closeConnection = closeConnection;
@@ -132,7 +133,7 @@ namespace Microsoft.Data.Sqlite
             }
 
             var rc = raw.sqlite3_step(_stmt);
-            SqliteException.ThrowExceptionForRC(rc, _connection.Handle);
+            SqliteException.ThrowExceptionForRC(rc, _command.Connection.Handle);
 
             _done = rc == raw.SQLITE_DONE;
 
@@ -150,8 +151,6 @@ namespace Microsoft.Data.Sqlite
                 return false;
             }
 
-            _stmt.Dispose();
-
             (_stmt, _hasRows) = _stmtQueue.Dequeue();
             _stepped = false;
             _done = false;
@@ -173,17 +172,6 @@ namespace Microsoft.Data.Sqlite
         /// </param>
         protected override void Dispose(bool disposing)
         {
-            if (_stmt != null)
-            {
-                _stmt.Dispose();
-                _stmt = null;
-            }
-
-            while (_stmtQueue.Count != 0)
-            {
-                _stmtQueue.Dequeue().stmt.Dispose();
-            }
-
             if (!disposing)
             {
                 return;
@@ -193,7 +181,7 @@ namespace Microsoft.Data.Sqlite
 
             if (_closeConnection)
             {
-                _connection.Close();
+                _command.Connection.Close();
             }
         }
 

test/Microsoft.Data.Sqlite.Tests/SqliteCommandTest.cs

@@ -33,18 +33,36 @@ namespace Microsoft.Data.Sqlite
             }
         }
 
+        [Fact]
+        public void Connection_can_be_nullified()
+        {
+            using (var connection = new SqliteConnection("Data Source=:memory:"))
+            {
+                connection.Open();
+
+                var command = connection.CreateCommand();
+                command.CommandText = "CREATE TABLE Data (Value);";
+                command.Prepare();
+
+                command.Connection = null;
+                Assert.Null(command.Connection);
+            }
+        }
+
         [Fact]
         public void CommandType_text_by_default()
         {
             Assert.Equal(CommandType.Text, new SqliteCommand().CommandType);
         }
 
-        [Fact]
-        public void CommandType_validates_value()
+        [Theory]
+        [InlineData(CommandType.StoredProcedure)]
+        [InlineData(CommandType.TableDirect)]
+        public void CommandType_validates_value(CommandType commandType)
         {
-            var ex = Assert.Throws<ArgumentException>(() => new SqliteCommand().CommandType = CommandType.StoredProcedure);
+            var ex = Assert.Throws<ArgumentException>(() => new SqliteCommand().CommandType = commandType);
 
-            Assert.Equal(Resources.InvalidCommandType(CommandType.StoredProcedure), ex.Message);
+            Assert.Equal(Resources.InvalidCommandType(commandType), ex.Message);
         }
 
         [Fact]
@@ -65,9 +83,49 @@ namespace Microsoft.Data.Sqlite
         }
 
         [Fact]
-        public void Prepare_does_nothing()
+        public void Prepare_throws_when_no_connection()
         {
-            new SqliteCommand().Prepare();
+            var ex = Assert.Throws<InvalidOperationException>(() => new SqliteCommand().Prepare());
+
+            Assert.Equal(Resources.CallRequiresOpenConnection("Prepare"), ex.Message);
+        }
+
+        [Fact]
+        public void Prepare_throws_when_connection_closed()
+        {
+            using (var connection = new SqliteConnection("Data Source=:memory:"))
+            {
+                var ex = Assert.Throws<InvalidOperationException>(() => connection.CreateCommand().Prepare());
+
+                Assert.Equal(Resources.CallRequiresOpenConnection("Prepare"), ex.Message);
+            }
+        }
+
+        [Fact]
+        public void Prepare_throws_when_no_command_text()
+        {
+            using (var connection = new SqliteConnection("Data Source=:memory:"))
+            {
+                connection.Open();
+
+                var ex = Assert.Throws<InvalidOperationException>(() => connection.CreateCommand().Prepare());
+
+                Assert.Equal(Resources.CallRequiresSetCommandText("Prepare"), ex.Message);
+            }
+        }
+
+        [Fact]
+        public void Prepare_throws_when_command_text_contains_dependent_commands()
+        {
+            using (var connection = new SqliteConnection("Data Source=:memory:"))
+            {
+                connection.Open();
+                var command = connection.CreateCommand();
+                command.CommandText = "CREATE TABLE Data (Value); INSERT INTO Data VALUES (0);";
+                var ex = Assert.Throws<SqliteException>(() => command.Prepare());
+
+                Assert.Equal(1, ex.SqliteErrorCode);
+            }
         }
 
         [Fact]
@@ -167,6 +225,19 @@ namespace Microsoft.Data.Sqlite
             }
         }
 
+        [Fact]
+        public void ExecuteNonQuery_processes_dependent_commands()
+        {
+            using (var connection = new SqliteConnection("Data Source=:memory:"))
+            {
+                connection.Open();
+                var command = connection.CreateCommand();
+                command.CommandText = "CREATE TABLE Data (Value); INSERT INTO Data VALUES (0);";
+
+                command.ExecuteNonQuery();
+            }
+        }
+
         [Fact]
         public void ExecuteScalar_returns_null_when_empty()
         {
@@ -259,6 +330,24 @@ namespace Microsoft.Data.Sqlite
             }
         }
 
+        [Fact]
+        public void ExecuteReader_reuse_statement()
+        {
+            using (var connection = new SqliteConnection("Data Source=:memory:"))
+            {
+                connection.Open();
+                var command = connection.CreateCommand();
+                command.CommandText = "SELECT @Parameter;";
+                command.Prepare();
+                command.Parameters.AddWithValue("@Parameter", 1);
+
+                Assert.Equal(1L, command.ExecuteScalar());
+
+                command.Parameters["@Parameter"].Value = 2;
+                Assert.Equal(2L, command.ExecuteScalar());
+            }
+        }
+
         [Fact]
         public void ExecuteReader_throws_when_parameter_unset()
         {