/// <summary>
/// Initializes a new instance of the <see cref="SqlSubquery"/> class using the
/// specified <paramref name="query"/> and <paramref name="alias"/>.
/// </summary>
/// <param name="query">
/// The <see cref="SqlSelect"/> query to use as an expression.
/// </param>
/// <param name="alias">
/// The alias used for the subquery.
/// </param>
/// <exception cref="ArgumentNullException">
/// Thrown when the <paramref name="query"/> or <paramref name="alias"/> argument is
/// <see langword="null"/>.
/// </exception>
public SqlSubquery(SqlSelect query, string alias)
: base(alias)
{
if (query == null) throw new ArgumentNullException(nameof(query));
Query = query;
}
/// <summary>
/// Initializes a new instance of the <see cref="SqlSubquery"/> class using the
/// specified <paramref name="query"/> and <paramref name="alias"/>.
/// </summary>
/// <param name="query">
/// The <see cref="SqlSelect"/> query to use as an expression.
/// </param>
/// <param name="alias">
/// The alias used for the subquery.
/// </param>
/// <exception cref="ArgumentNullException">
/// Thrown when the <paramref name="query"/> or <paramref name="alias"/> argument is
/// <see langword="null"/>.
/// </exception>
public SqlSubquery(SqlSelect query, string alias)
: base(alias)
{
if (query == null)
{
throw new ArgumentNullException(nameof(query));
}
Query = query;
}
/// <summary>
/// Converts the specified <see cref="SqlSelect"/> expression tree to an <see cref="IDbCommand"/>
/// instance for the specified <paramref name="connection" />.
/// </summary>
/// <param name="sql">
/// The <see cref="SqlSelect"/> to convert to an <see cref="IDbCommand"/>.
/// </param>
/// <param name="connection">
/// The <see cref="IDbConnection"/> for which to create an <see cref="IDbCommand"/>.
/// </param>
/// <returns>
/// An <see cref="IDbCommand"/> for the specified <paramref name="connection"/> that reprents
/// the specified SQL expression tree.
/// </returns>
/// <remarks>
/// Any <see cref="SqlParameter"/> members of the <see cref="SqlSelect"/> expression are
/// automatically converted to <see cref="IDbDataParameter"/> instances and attached to
/// the returned <see cref="IDbCommand"/>.
/// </remarks>
public static IDbCommand ToCommand(this SqlSelect sql, IDbConnection connection)
{
return(connection.CreateCommandInternal(sql));
}
/// <summary>
/// Converts the specified <see cref="SqlSelect"/> expression tree to SQL text.
/// </summary>
/// <param name="sql">
/// The <see cref="SqlSelect"/> to convert to SQL text.
/// </param>
/// <param name="dialect">
/// The <see cref="SqlDialect"/> used to format the SQL text.
/// </param>
/// <param name="parameterCallback">
/// A delegate that is called when a SQL parameter is encountered while converting the SQL expression.
/// </param>
/// <returns>
/// The SQL text for the specified SQL expression tree.
/// </returns>
public static string ToSql(this SqlSelect sql, SqlDialect dialect, Action <SqlParameter> parameterCallback)
{
return(sql.ToSqlInternal(dialect, parameterCallback));
}
public override void Visit(SqlSelect expression)
{
_writer.WriteKeyword(SqlKeywords.Select);
}
/// <summary>
/// Converts the specified <see cref="SqlSelect"/> expression tree to SQL text.
/// </summary>
/// <param name="sql">
/// The <see cref="SqlSelect"/> to convert to SQL text.
/// </param>
/// <param name="dialect">
/// The <see cref="SqlDialect"/> used to format the SQL text.
/// </param>
/// <returns>
/// The SQL text for the specified SQL expression tree.
/// </returns>
public static string ToSql(this SqlSelect sql, SqlDialect dialect)
{
return(sql.ToSqlInternal(dialect));
}
/// <summary>
/// Converts the specified <see cref="SqlSelect"/> expression tree to SQL text.
/// </summary>
/// <param name="sql">
/// The <see cref="SqlSelect"/> to convert to SQL text.
/// </param>
/// <param name="parameterCallback">
/// A delegate that is called when a SQL parameter is encountered while converting the SQL expression.
/// </param>
/// <returns>
/// The SQL text for the specified SQL expression tree.
/// </returns>
public static string ToSql(this SqlSelect sql, Action <SqlParameter> parameterCallback)
{
return(sql.ToSql(null, parameterCallback));
}
/// <summary>
/// Converts the specified <see cref="SqlSelect"/> expression tree to SQL text.
/// </summary>
/// <param name="sql">
/// The <see cref="SqlSelect"/> to convert to SQL text.
/// </param>
/// <returns>
/// The SQL text for the specified SQL expression tree.
/// </returns>
public static string ToSql(this SqlSelect sql)
{
return(sql.ToSql(null, null));
}
protected override SqlExpression VisitSelect(SqlSelect expression)
{
_writer.WriteStartSelect();
if (expression.Columns.Any())
{
foreach (var column in expression.Columns)
{
_writer.WriteColumn(column.TableName, column.ColumnName, column.Alias);
}
}
else
{
// TODO: Don't know what will happen here.
_writer.WriteColumn("*");
}
if (expression.Table != null)
{
_writer.WriteStartFrom();
_writer.WriteTable(expression.Table.TableName, expression.Table.Alias);
foreach (var join in expression.Joins)
{
Visit(join);
}
if (expression.Predicate != null)
{
_writer.WriteStartWhere();
Visit(expression.Predicate);
}
if (expression.Sorting.Any())
{
_writer.WriteStartOrderBy();
Visit(expression.Sorting);
}
}
_writer.WriteEndSelect();
return expression;
}
/// <summary>
/// Converts the specified <see cref="SqlSelect"/> expression tree to an <see cref="IDbCommand"/>
/// instance for the specified <paramref name="connection" />.
/// </summary>
/// <param name="sql">
/// The <see cref="SqlSelect"/> to convert to an <see cref="IDbCommand"/>.
/// </param>
/// <param name="connection">
/// The <see cref="IDbConnection"/> for which to create an <see cref="IDbCommand"/>.
/// </param>
/// <returns>
/// An <see cref="IDbCommand"/> for the specified <paramref name="connection"/> that reprents
/// the specified SQL expression tree.
/// </returns>
/// <remarks>
/// Any <see cref="SqlParameter"/> members of the <see cref="SqlSelect"/> expression are
/// automatically converted to <see cref="IDbDataParameter"/> instances and attached to
/// the returned <see cref="IDbCommand"/>.
/// </remarks>
public static IDbCommand CreateCommand(this IDbConnection connection, SqlSelect sql)
{
return connection.CreateCommandInternal(sql);
}
