218 lines
8.8 KiB
C#
218 lines
8.8 KiB
C#
using System.Collections.Generic;
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using System.Text;
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using System.Linq;
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using AyaNova.Biz;
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namespace AyaNova.PickList
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{
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internal static class PickListSqlBuilder
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{
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//Maximum number of results to return at any given time
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//did a little research and may adjust this but it can be fairly girthy in this day and age
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//and many people might not want or need to autocomplete type if we provide enough leeway.
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//for example, if you're selecting a
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const int MAXIMUM_RESULT_COUNT = 100;
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//Build the query for a picklist request
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internal static string Build(IAyaPickList pickList, List<string> templateColumnNames, string autoCompleteQuery, bool IncludeInactive)
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{
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//determine this in advance as it will be used in a loop later
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bool HasAutoCompleteQuery = !string.IsNullOrWhiteSpace(autoCompleteQuery);
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//lists to collect the clauses so to avoid comma fuckery
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List<string> lSelect = new List<string>();
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string ActiveWhereFragment = string.Empty;
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List<string> lWhere = new List<string>();
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List<string> lOrderBy = new List<string>();
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string PlIdSelectFragment = string.Empty;
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string ActiveSelectFragment = string.Empty;
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//PROCESS ROW ID "VALUE" COLUMN
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//
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AyaPickListFieldDefinition rowIdColumn = pickList.ColumnDefinitions.FirstOrDefault(x => x.IsRowId == true);
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//this should only happen with a development error
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if (rowIdColumn == null)
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throw new System.ArgumentNullException($"DEV ERROR in PickListSqlBuilder.cs: picklist for {pickList.DefaultListObjectType.ToString()} has no rowId column specified in columnDefinitions list");
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PlIdSelectFragment = rowIdColumn.SqlIdColumnName + " as plId";
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//PROCESS ACTIVE COLUMN
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//
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//NOTE: default is to filter *out* inactive objects because that's the most common need at the Client
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//but we provide the override for that if necessary as there are often (management usually) cases where user needs to select inactive records
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//add active column, fake it if necessary
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AyaPickListFieldDefinition activeColumn = pickList.ColumnDefinitions.FirstOrDefault(x => x.IsActiveColumn == true);
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if (activeColumn == null)
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{
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//no active column which is normal for some types of objects
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//so make a fake one and return them all as active=true as all lists must return the same format
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ActiveSelectFragment = "true as plActive";
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}
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else
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{
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//we have an active column, set accordingly
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//regardless of wanting to see inactive, we always want to see the column itself
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ActiveSelectFragment = activeColumn.SqlValueColumnName + " as plActive";
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//this is the normal path unless there is an override
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//if there is an override to see inactive too then we just don't set the filter on active
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if (!IncludeInactive)
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{
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ActiveWhereFragment = activeColumn.SqlValueColumnName + " = true";
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}
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}
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//PROCESS TEMPLATED COLUMNS TO BE RETURNED IN RESULTS
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//
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foreach (string ColumnName in templateColumnNames)
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{
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AyaPickListFieldDefinition o = pickList.ColumnDefinitions.FirstOrDefault(x => x.FieldKey == ColumnName);
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#if (DEBUG)
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if (o == null)
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{
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throw new System.ArgumentNullException($"DEV ERROR in PickListSqlBuilder.cs: field {ColumnName} specified in template was NOT found in columnDefinitions list");
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}
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#endif
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if (o != null)
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{//Ignore missing fields in production
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var valueColumnName = o.GetSqlValueColumnName();
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string sWhere = string.Empty;
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//TAGS COLUMN
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//
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if (o.ColumnDataType == UiFieldDataType.Tags)
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{
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//Handle tags for each part of the sql query
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//idea is they display as a comma separated list,
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//filter as a like comparison to each individual tag and
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//order by the array which appears in testing to do it left to right as if it was a giant string
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lSelect.Add($"(array_to_string({valueColumnName},',')");
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//tags can order by without the arraytostring
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lOrderBy.Add(valueColumnName);
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//THIS is the best filter method for a like comparison to each individual tag:
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//(array_to_string(awidget.tags,',') like '%zo%')
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if (HasAutoCompleteQuery)
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sWhere = $"(array_to_string({valueColumnName},',') like '%{autoCompleteQuery}%')";
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}
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else if (o.ColumnDataType == UiFieldDataType.Text || o.ColumnDataType == UiFieldDataType.EmailAddress || o.ColumnDataType == UiFieldDataType.HTTP)
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{
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//TEXT COLUMN
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//
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lSelect.Add(valueColumnName);
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lOrderBy.Add(valueColumnName);
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if (HasAutoCompleteQuery)
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sWhere = $"({valueColumnName} like '%{autoCompleteQuery}%')";
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}
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else
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{
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//NON-TEXT COLUMN
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//
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//Note: if any part of a select contatenation query using the || postgres concat is text then all fields are automatically converted to text
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//so no need to make it text here as the automatic spacing character will force the whole thing to a text concat anyway
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//ref: https://stackoverflow.com/a/19943343/8939
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lSelect.Add(valueColumnName);
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//order by for now seems to be best as just order by it's value whatever it is
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lOrderBy.Add(valueColumnName);
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//Where fragment is different for non text fields: it needs to be cast to text to like query on it
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//(cast (awidget.serial as text) like '%some%')
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if (HasAutoCompleteQuery)
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sWhere = $"(cast ({valueColumnName} as text) like '%{autoCompleteQuery}%')";
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}
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if (HasAutoCompleteQuery)
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lWhere.Add(sWhere);
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}
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}
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StringBuilder sb = new StringBuilder();
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//SELECT
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sb.Append("select ");
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//ID COLUMN
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sb.Append(PlIdSelectFragment);
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sb.Append(", ");
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//ACTIVE COLUMN
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sb.Append(ActiveSelectFragment);
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sb.Append(", ");
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//select name || ' ' || serial || ' ' || array_to_string(tags,',') as display from awidget
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foreach (string s in lSelect)
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{
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sb.Append(s);
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sb.Append(" || ' ' || ");//sb 11 characters
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}
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//clear trailing concat element
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sb.Length -= 11;//length of last concat fragment above
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sb.Append(" as plname");
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//FROM
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sb.Append(" ");
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sb.Append(pickList.SQLFrom);
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//WHERE
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sb.Append(" where ");
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if (!IncludeInactive)
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{
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sb.Append(ActiveWhereFragment);
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sb.Append(" and (");
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}
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foreach (string s in lWhere)
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{
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sb.Append(s);
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sb.Append(" or ");
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}
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//clear trailing or
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sb.Length -= 4;
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//enclosing parenthesis
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if (!IncludeInactive)
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{
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sb.Append(")");
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}
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//ORDER BY
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sb.Append(" order by ");
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foreach (string s in lOrderBy)
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{
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sb.Append(s);
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sb.Append(",");
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}
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//clear trailing comma
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sb.Length--;
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//LIMIT
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sb.Append($" limit {MAXIMUM_RESULT_COUNT}");
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return sb.ToString();
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}
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//"select awidget.id as plId || ' 'awidget.active as plActive || ' 'awidget.name || ' 'awidget.serial || ' 'auser.name as plname from awidget left outer join auser on (awidget.userid=auser.id)
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//where awidget.active = true and ((awidget.name like '%on%') or (cast (awidget.serial as text) like '%on%') or (auser.name like '%on%')) order by awidget.name,awidget.serial,auser.name limit 100"
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}//eoc
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}//ens
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