/// <summary>
/// Creates a <see cref="SqlBinaryExpression"/> that represents an equality comparison.
/// </summary>
/// <param name="column">
/// A <see cref="SqlColumn"/> to use as the left operand in the expression.
/// </param>
/// <param name="value">
/// A <see cref="SqlValue"/> to use as the right operand in the expression.
/// </param>
/// <returns>
/// A <see cref="SqlBinaryExpression"/> that represents an equality comparison between
/// the value of the specified <paramref name="column"/> and the specified <paramref name="value"/>.
/// </returns>
/// <remarks>
/// If you pass <see langword="null"/> for the <paramref name="value"/> argument, it
/// will be automatically converted to <see cref="SqlConstant.Null"/>.
/// </remarks>
public static SqlBinaryExpression Equal(SqlColumn column, SqlValue value)
{
return new SqlBinaryExpression(column, SqlBinaryOperator.Equal, value ?? SqlConstant.Null);
}
/// <summary>
/// Creates a <see cref="SqlBinaryExpression"/> that represents an "greater than" comparison.
/// </summary>
/// <param name="column">
/// A <see cref="SqlColumn"/> to use as the left operand in the expression.
/// </param>
/// <param name="value">
/// A <see cref="SqlValue"/> to use as the right operand in the expression.
/// </param>
/// <returns>
/// A <see cref="SqlBinaryExpression"/> that represents an "greater than" comparison between
/// the value of the specified <paramref name="column"/> and the specified <paramref name="value"/>.
/// </returns>
/// <remarks>
/// If you pass <see langword="null"/> for the <paramref name="value"/> argument, it
/// will be automatically converted to <see cref="SqlConstant.Null"/>.
/// </remarks>
public static SqlBinaryExpression GreaterThan(SqlColumn column, SqlValue value)
{
return new SqlBinaryExpression(column, SqlBinaryOperator.GreaterThan, value ?? SqlConstant.Null);
}
/// <summary>
/// Creates a <see cref="SqlBinaryExpression"/> that represents an "in" comparison.
/// </summary>
/// <param name="column">
/// A <see cref="SqlColumn"/> to use as the left operand in the expression.
/// </param>
/// <param name="values">
/// A collection of <see cref="SqlValue"/> to use as the right operand in the expression.
/// </param>
/// <returns>
/// A <see cref="SqlBinaryExpression"/> that represents an "in" comparison between
/// the value of the specified <paramref name="column"/> and the specified collection of
/// <paramref name="values"/>.
/// </returns>
/// <remarks>
/// If you pass <see langword="null"/> for the <paramref name="values"/> argument, it
/// will be automatically converted to an empty collection.
/// </remarks>
public static SqlBinaryExpression In(SqlColumn column, params SqlValue[] values)
{
return new SqlBinaryExpression(column, SqlBinaryOperator.In, new SqlValueList(values ?? Enumerable.Empty<SqlValue>()));
}
/// <summary>
/// Creates a <see cref="SqlBinaryExpression"/> that represents an "in" comparison.
/// </summary>
/// <param name="column">
/// A <see cref="SqlColumn"/> to use as the left operand in the expression.
/// </param>
/// <param name="query">
/// A <see cref="SqlSubquery"/> to use as the right operand in the expression.
/// </param>
/// <returns>
/// A <see cref="SqlBinaryExpression"/> that represents an "in" comparison between
/// the value of the specified <paramref name="column"/> and the specified <paramref name="query"/>.
/// </returns>
public static SqlBinaryExpression In(SqlColumn column, SqlSubquery query)
{
return new SqlBinaryExpression(column, SqlBinaryOperator.In, query);
}
public ISqlGroupByClause GroupBy(SqlColumn column)
{
return(new GroupByClause(Parent, column));
}
public ISqlThenByClause <SqlSelect> OrderBy(SqlColumn column, SqlSortOrder sortOrder)
{
return(new OrderByClause(Parent, column, sortOrder));
}
internal SqlAssign(SqlColumn column, SqlValue value)
{
if (column == null) throw new ArgumentNullException(nameof(column));
Column = column;
Value = value ?? SqlConstant.Null;
}
public ISqlSetClause Set(SqlColumn column, SqlValue value)
{
return(new SetClause(Parent, column, value));
}
protected override SqlExpression VisitColumn(SqlColumn expression)
{
_writer.WriteColumn(expression.TableName, expression.ColumnName, expression.Alias);
return expression;
}
