protected override bool ForceParenthesesForQueryExpressionPart(IExprSubQuery subQuery)
{
return(subQuery switch
{
ExprQuerySpecification specification => !ReferenceEquals(specification.Top, null),
_ => true
});
public bool VisitExprQuerySpecification(ExprQuerySpecification expr, TCtx arg)
{
var res = this.Visit(expr, "QuerySpecification", arg, out var argOut) && this.Accept("SelectList", expr.SelectList, argOut) && this.Accept("Top", expr.Top, argOut) && this.Accept("From", expr.From, argOut) && this.Accept("Where", expr.Where, argOut) && this.Accept("GroupBy", expr.GroupBy, argOut);
this.VisitPlainProperty("Distinct", expr.Distinct, argOut);
this._visitor.EndVisitExpr(expr, arg);
return(res);
}
public static ExprQuerySpecification WithCrossJoin(this ExprQuerySpecification querySpecification, IExprTableSource tableSource)
{
if (querySpecification.From == null)
{
throw new SqExpressException("Query Specification \"From\" cannot be null");
}
var newJoin = new ExprCrossedTable(querySpecification.From, tableSource);
return(querySpecification.WithFrom(newJoin));
}
private static ExprQuerySpecification JoinQuerySpecification(ExprJoinedTable.ExprJoinType exprJoinType,
ExprQuerySpecification querySpecification, IExprTableSource tableSource, ExprBoolean @on)
{
if (querySpecification.From == null)
{
throw new SqExpressException("Query Specification \"From\" cannot be null");
}
var newJoin = new ExprJoinedTable(querySpecification.From, exprJoinType, tableSource, on);
return(querySpecification.WithFrom(newJoin));
}
public bool VisitExprQuerySpecification(ExprQuerySpecification exprQuerySpecification, IExpr?parent)
{
this.Builder.Append("SELECT ");
if (exprQuerySpecification.Distinct)
{
this.Builder.Append("DISTINCT ");
}
if (!ReferenceEquals(exprQuerySpecification.Top, null))
{
this.AppendSelectTop(exprQuerySpecification.Top, exprQuerySpecification);
}
this.AcceptListComaSeparated(exprQuerySpecification.SelectList, exprQuerySpecification);
if (exprQuerySpecification.From != null)
{
this.Builder.Append(" FROM ");
exprQuerySpecification.From.Accept(this, exprQuerySpecification);
}
if (exprQuerySpecification.Where != null)
{
this.Builder.Append(" WHERE ");
exprQuerySpecification.Where.Accept(this, exprQuerySpecification);
}
if (exprQuerySpecification.GroupBy != null)
{
this.Builder.Append(" GROUP BY ");
this.AcceptListComaSeparated(exprQuerySpecification.GroupBy, exprQuerySpecification);
}
if (!ReferenceEquals(exprQuerySpecification.Top, null) && !(parent is ExprSelect) && !(parent is ExprSelectOffsetFetch))
{
//For non T-SQL (PostgresSQL, My SQL)
this.AppendSelectLimit(exprQuerySpecification.Top, exprQuerySpecification);
}
return(true);
}
public static ExprQuerySpecification WithSelectList(this ExprQuerySpecification original, SelectingProxy selection, params SelectingProxy[] selections) => new ExprQuerySpecification(selectList: Helpers.Combine(selection, selections, SelectingProxy.MapSelectionProxy), top: original.Top, from: original.From, where : original.Where, groupBy : original.GroupBy, distinct : original.Distinct);
public static ExprQuerySpecification WithFullJoin(this ExprQuerySpecification querySpecification, IExprTableSource tableSource, ExprBoolean on) => JoinQuerySpecification(ExprJoinedTable.ExprJoinType.Full, querySpecification, tableSource, on);
public static ExprQuerySpecification WithDistinct(this ExprQuerySpecification original, Boolean newDistinct) => new ExprQuerySpecification(selectList: original.SelectList, top: original.Top, from: original.From, where : original.Where, groupBy : original.GroupBy, distinct : newDistinct);
public static ExprQuerySpecification WithGroupBy(this ExprQuerySpecification original, IReadOnlyList <ExprColumn>?newGroupBy) => new ExprQuerySpecification(selectList: original.SelectList, top: original.Top, from: original.From, where : original.Where, groupBy : newGroupBy, distinct : original.Distinct);
public static ExprQuerySpecification WithWhere(this ExprQuerySpecification original, ExprBoolean?newWhere) => new ExprQuerySpecification(selectList: original.SelectList, top: original.Top, from: original.From, where : newWhere, groupBy : original.GroupBy, distinct : original.Distinct);
public static ExprQuerySpecification WithFrom(this ExprQuerySpecification original, IExprTableSource?newFrom) => new ExprQuerySpecification(selectList: original.SelectList, top: original.Top, from: newFrom, where : original.Where, groupBy : original.GroupBy, distinct : original.Distinct);
public static ExprQuerySpecification WithTop(this ExprQuerySpecification original, ExprValue?newTop) => new ExprQuerySpecification(selectList: original.SelectList, top: newTop, from: original.From, where : original.Where, groupBy : original.GroupBy, distinct : original.Distinct);
public static ExprQuerySpecification WithSelectList(this ExprQuerySpecification original, IReadOnlyList <IExprSelecting> newSelectList) => new ExprQuerySpecification(selectList: newSelectList, top: original.Top, from: original.From, where : original.Where, groupBy : original.GroupBy, distinct : original.Distinct);
