private static AbstractSqlCondition ParseBinaryExpression(AbstractSqlCommandWithWhere sourceCommand, BinaryExpression expr)
{
switch (expr.NodeType)
{
case ExpressionType.Equal:
return(ParseBinaryExpression(sourceCommand, expr, SqlOperator.Equal));
case ExpressionType.NotEqual:
return(ParseBinaryExpression(sourceCommand, expr, SqlOperator.NotEqual));
case ExpressionType.GreaterThan:
return(ParseBinaryExpression(sourceCommand, expr, SqlOperator.GreaterThan));
case ExpressionType.LessThan:
return(ParseBinaryExpression(sourceCommand, expr, SqlOperator.LessThan));
case ExpressionType.GreaterThanOrEqual:
return(ParseBinaryExpression(sourceCommand, expr, SqlOperator.GreaterThanOrEqual));
case ExpressionType.LessThanOrEqual:
return(ParseBinaryExpression(sourceCommand, expr, SqlOperator.LessThanOrEqual));
case ExpressionType.And:
case ExpressionType.AndAlso:
return(SqlLinqCondition.ParseCondition(sourceCommand, expr.Left) & SqlLinqCondition.ParseCondition(sourceCommand, expr.Right));
case ExpressionType.Or:
case ExpressionType.OrElse:
return(SqlLinqCondition.ParseCondition(sourceCommand, expr.Left) | SqlLinqCondition.ParseCondition(sourceCommand, expr.Right));
default:
throw new LinqNotSupportedException("Not supported this linq operation!");
}
}
/// <summary>
/// 创建新的Sql条件语句
/// </summary>
/// <typeparam name="T">实体类类型</typeparam>
/// <param name="sourceCommand">来源语句</param>
/// <param name="expr">Linq表达式</param>
/// <exception cref="LinqNotSupportedException">Linq操作不支持</exception>
/// <exception cref="NullAttributeException">没有设置特性</exception>
/// <returns>Sql条件语句</returns>
public static AbstractSqlCondition Create <T>(AbstractSqlCommandWithWhere sourceCommand, Expression <Func <T, Boolean> > expr)
{
return(SqlLinqCondition.ParseCondition(sourceCommand, expr.Body));
}
