static void VisitStartsWith(SqlExpressionVisitor <TEntity> visitor, MethodCallExpression call)
{
visitor.Visit(call.Object);
visitor.AddFragment(" LIKE ");
visitor.Visit(call.Arguments[0]);
visitor.AddFragment(" || '%'");
}
static void VisitContains(SqlExpressionVisitor <TEntity> visitor, MethodCallExpression call)
{
visitor.Visit(call.Object);
visitor.AddFragment(" LIKE '%' || ");
visitor.Visit(call.Arguments[0]);
visitor.AddFragment(" || '%'");
}
static void VisitContains(SqlExpressionVisitor <TEntity> visitor, MethodCallExpression call)
{
visitor.Visit(call.Object);
visitor.AddFragment(" LIKE CONCAT('%', ");
visitor.Visit(call.Arguments[0]);
visitor.AddFragment(", '%')");
}
void IExpressionNodeVisitor <TEntity, BinaryExpression> .Visit(SqlExpressionVisitor <TEntity> visitor, BinaryExpression node)
{
visitor.Visit(node.Left);
visitor.AddFragment(" ");
visitor.AddFragment(_operator);
visitor.AddFragment(" ");
visitor.Visit(node.Right);
}
static void VisitSubstring(SqlExpressionVisitor <TEntity> visitor, MethodCallExpression call)
{
visitor.AddFragment("SUBSTRING(");
visitor.Visit(call.Object);
visitor.AddFragment(", ");
visitor.Visit(call.Arguments[0]);
visitor.AddFragment(", 8000)");
}
static void VisitSubstring(SqlExpressionVisitor <TEntity> visitor, MethodCallExpression call)
{
visitor.AddFragment("SUBSTR(");
visitor.Visit(call.Object);
foreach (var arg in call.Arguments)
{
visitor.AddFragment(", ");
visitor.Visit(arg);
}
visitor.AddFragment(")");
}
void IExpressionNodeVisitor <EntityType, BinaryExpression> .Visit(SqlExpressionVisitor <EntityType> visitor, BinaryExpression node)
{
if (node.Left.NodeType == ExpressionType.Constant && ((ConstantExpression)node.Left).Value == null)
{
visitor.Visit(node.Right);
visitor.AddFragment(" IS NOT NULL");
}
else if (node.Right.NodeType == ExpressionType.Constant && ((ConstantExpression)node.Right).Value == null)
{
visitor.Visit(node.Left);
visitor.AddFragment(" IS NOT NULL");
}
else
{
visitor.Visit(node.Left);
visitor.AddFragment(" <> ");
visitor.Visit(node.Right);
}
}
void IExpressionNodeVisitor <TEntity, UnaryExpression> .Visit(SqlExpressionVisitor <TEntity> visitor, UnaryExpression node)
{
visitor.Visit(node.Operand);
visitor.AddFragment(" <> 0");
}
static void VisitToLower(SqlExpressionVisitor <TEntity> visitor, MethodCallExpression call)
{
visitor.AddFragment("LOWER(");
visitor.Visit(call.Object);
visitor.AddFragment(")");
}
