public SqlExpression <T> Join <Source, Target>(Expression <Func <Source, Target, bool> > joinExpr = null)
{
PrefixFieldWithTableName = true;
var sourceDef = typeof(Source).GetModelDefinition();
var targetDef = typeof(Target).GetModelDefinition();
if (tableDefs.Count == 0)
{
tableDefs.Add(modelDef);
}
if (!tableDefs.Contains(sourceDef))
{
tableDefs.Add(sourceDef);
}
if (!tableDefs.Contains(targetDef))
{
tableDefs.Add(targetDef);
}
var fromExpr = FromExpression;
var sbJoin = new StringBuilder();
string sqlExpr;
if (joinExpr != null)
{
sqlExpr = Visit(joinExpr).ToString();
}
else
{
var refField = OrmLiteReadExtensions.GetRefFieldDef(sourceDef, targetDef, typeof(Source));
if (refField == null)
{
throw new ArgumentException("Could not infer relationship between {0} and {1}"
.Fmt(sourceDef.ModelName, targetDef.ModelName));
}
sqlExpr = "\n({0}.{1} = {2}.{3})".Fmt(
sourceDef.ModelName.SqlTable(),
sourceDef.PrimaryKey.FieldName.SqlColumn(),
targetDef.ModelName.SqlTable(),
refField.FieldName.SqlColumn());
}
sbJoin.Append(" INNER JOIN {0} ".Fmt(targetDef.ModelName.SqlTable()));
sbJoin.Append(" ON ");
sbJoin.Append(sqlExpr);
FromExpression = fromExpr + sbJoin;
return(this);
}
private SqlExpression <T> InternalJoin(string joinType,
Expression joinExpr, ModelDefinition sourceDef, ModelDefinition targetDef)
{
PrefixFieldWithTableName = true;
var fromExpr = FromExpression;
var sbJoin = new StringBuilder();
string sqlExpr;
//Changes how Sql Expressions are generated.
useFieldName = true;
sep = " ";
if (joinExpr != null)
{
sqlExpr = Visit(joinExpr).ToString();
}
else
{
var parentDef = sourceDef;
var childDef = targetDef;
var refField = OrmLiteReadExtensions.GetRefFieldDefIfExists(parentDef, childDef);
if (refField == null)
{
parentDef = targetDef;
childDef = sourceDef;
refField = OrmLiteReadExtensions.GetRefFieldDefIfExists(parentDef, childDef);
}
if (refField == null)
{
throw new ArgumentException("Could not infer relationship between {0} and {1}"
.Fmt(sourceDef.ModelName, targetDef.ModelName));
}
sqlExpr = "\n({0}.{1} = {2}.{3})".Fmt(
DialectProvider.GetQuotedTableName(parentDef),
SqlColumn(parentDef.PrimaryKey.FieldName),
DialectProvider.GetQuotedTableName(childDef),
SqlColumn(refField.FieldName));
}
var joinDef = tableDefs.Contains(targetDef) && !tableDefs.Contains(sourceDef)
? sourceDef
: targetDef;
sbJoin.Append(" {0} {1} ".Fmt(joinType, SqlTable(joinDef)));
sbJoin.Append(" ON ");
sbJoin.Append(sqlExpr);
FromExpression = fromExpr + sbJoin;
if (!tableDefs.Contains(sourceDef))
{
tableDefs.Add(sourceDef);
}
if (!tableDefs.Contains(targetDef))
{
tableDefs.Add(targetDef);
}
return(this);
}
