Terrasoft.EntitySchemaQuery query column is Terrassoft.EntityQueryColumn class instance. You can specify main characteristics of column instance in its properties: title, display value, checkboxes, sorting order and direction etc. 

addColumn() method that returns instance of column, added to query, is designed for adding columns to queries. The column name relative to root schema is formed in addColumn() methods in accordance with rules, described in Building of paths to columns relative to root schema. This method has several variants that allow for adding columns with different parameters to a query (table 1).

Table 1. — Method of adding columns to query

Examples of addition of columns to query

Example 1. — Adding query column from root schema to query column collection

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addColumn("DurationInMinutes", "ActivityDuration");

Example 2. — Adding aggregation column query with SUM aggregation type, applied to all table records, to query column collection

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addAggregationSchemaColumn("DurationInMinutes", Terrasoft.AggregationType.SUM, "ActivitiesDuration", Terrasoft.AggregationEvalType.ALL);

Example 3. —  Adding aggregation column query with COUNT aggregation type, applied to table unique records, to query column collection

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addAggregationSchemaColumn("DurationInMinutes", Terrasoft.AggregationType.COUNT, "UniqueActivitiesCount", Terrasoft.AggregationEvalType.DISTINCT);

Example 4. —  Adding parameter column with TEXT data type to query column type

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addParameterColumn("DurationInMinutes", Terrasoft.DataValueType.TEXT, "DurationColumnName");

Example 5. — Adding function column with LENGTH function type (value size in bytes) to query column collection

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addFunctionColumn("Photo.Data", Terrasoft.FunctionType.LENGTH, "PhotoLength");

Example 6. — Adding function column with Date-Part function type (date part) to query column collection. Week day is used as a value

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addDatePartFunctionColumn("StartDate", Terrasoft.DatePartType.WEEK_DAY, "StartDay");

Example 7. — Adding function column with MACROS type that don't require parameterization, i.e. PRIMARY_DISPLY-COLUMN (Primary Display Column), to query column collection

var esq = this.Ext.create(Terrasoft.EntitySchemaQuery, {
    rootSchemaName: "Activity"
});
esq.addMacrosColumn(Terrasoft.QueryMacrosType.PRIMARY_DISPLAY_COLUMN, "PrimaryDisplayColumnValue");

See Also