public SqlExpression <T> LeftJoin <Source, Target>(Expression <Func <Source, Target, bool> > joinExpr, TableOptions options) =>
InternalJoin("LEFT JOIN", joinExpr, options);
public SqlExpression <T> LeftJoin <Target>(Expression <Func <T, Target, bool> > joinExpr, TableOptions options) =>
InternalJoin("LEFT JOIN", joinExpr, options ?? throw new ArgumentNullException(nameof(options)));
protected virtual SqlExpression <T> InternalJoin(string joinType, Expression joinExpr, ModelDefinition sourceDef, ModelDefinition targetDef, TableOptions options = null)
{
PrefixFieldWithTableName = true;
//Changes how Sql Expressions are generated.
useFieldName = true;
sep = " ";
var joinFormat = options?.JoinFormat;
if (options?.Alias != null) //Set joinAlias
{
options.ParamName = joinExpr is LambdaExpression l && l.Parameters.Count == 2
? l.Parameters[1].Name
: null;
if (options.ParamName != null)
{
joinFormat = null;
options.ModelDef = targetDef;
joinAlias = options;
}
}
if (!tableDefs.Contains(sourceDef))
{
tableDefs.Add(sourceDef);
}
if (!tableDefs.Contains(targetDef))
{
tableDefs.Add(targetDef);
}
var isCrossJoin = "CROSS JOIN" == joinType;
var sqlExpr = joinExpr != null
? InternalCreateSqlFromExpression(joinExpr, isCrossJoin)
: InternalCreateSqlFromDefinitions(sourceDef, targetDef, isCrossJoin);
var joinDef = tableDefs.Contains(targetDef) && !tableDefs.Contains(sourceDef)
? sourceDef
: targetDef;
FromExpression += joinFormat != null
? $" {joinType} {joinFormat(DialectProvider, joinDef, sqlExpr)}"
: joinAlias != null
? $" {joinType} {SqlTable(joinDef)} AS {DialectProvider.GetQuotedName(joinAlias.Alias)} {sqlExpr}"
: $" {joinType} {SqlTable(joinDef)} {sqlExpr}";
if (joinAlias != null) //Unset joinAlias
{
joinAlias = null;
if (options != null)
{
options.ParamName = null;
options.ModelDef = null;
}
}
return(this);
}
public SqlExpression <T> Join <Target>(Expression <Func <T, Target, bool> > joinExpr, TableOptions options)
{
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
if (options.Expression != null)
{
throw new ArgumentException("Can't set both Join Expression and TableOptions Expression");
}
return(InternalJoin("INNER JOIN", joinExpr, options));
}
protected SqlExpression <T> InternalJoin <Source, Target>(string joinType, Expression <Func <Source, Target, bool> > joinExpr, TableOptions options = null)
{
var sourceDef = typeof(Source).GetModelDefinition();
var targetDef = typeof(Target).GetModelDefinition();
return(InternalJoin(joinType, joinExpr, sourceDef, targetDef, options));
}
