Multiple left join examples for an Access database

Code:

/// <summary>///Category search Query Selectname/// </summary> Public StaticDataTable Getselectname_fljs (stringTHING_TYPE_ID,stringMEN_ID,stringGANG_ID,stringMU_ID,stringKE_ID,stringshu_id) {StringBuilder SB=NewStringBuilder (string. Format (@"Select SN. Sel_chiname as Chinese name, SN. Sel_engname as English name, SN. Sel_latname as scientific name, SN. THING_ID, SN. Sel_type, SN. THING_SHU_ID, SN. THING_PRO_ID, SN. Thing_area_id from (((((Selectname SN left join Shu s on sn.thing_shu_id=s.shu_id) le         ft join Ke k on s.ke_id=k.ke_id) left join Mu m on m.mu_id=k.mu_id) left join Gang G on g.gang_id=m.gang_id)        Left join men me on me.men_id=g.men_id) left join Thing_type TT on TT.THING_TYPE_ID=ME.THING_TYPE_ID where 1=1")); if(!string. Isnullorwhitespace (thing_type_id)&&int. Parse (thing_type_id)! =common.optionallval) {sb. Append (string. Format (@"and tt.thing_type_id={0}", Strutil.sqlclean (thing_type_id))); }    if(!string. Isnullorwhitespace (men_id)&&int. Parse (men_id)! =common.optionallval) {sb. Append (string. Format (@"and me.men_id={0}", Strutil.sqlclean (men_id))); }    if(!string. Isnullorwhitespace (gang_id)&&int. Parse (gang_id)! =common.optionallval) {sb. Append (string. Format (@"and g.gang_id={0}", Strutil.sqlclean (gang_id))); }    if(!string. Isnullorwhitespace (mu_id)&&int. Parse (mu_id)! =common.optionallval) {sb. Append (string. Format (@"and m.mu_id={0}", Strutil.sqlclean (mu_id))); }    if(!string. Isnullorwhitespace (ke_id)&&int. Parse (ke_id)! =common.optionallval) {sb. Append (string. Format (@"and k.ke_id={0}", Strutil.sqlclean (ke_id))); }    if(!string. Isnullorwhitespace (shu_id)&&int. Parse (shu_id)! =common.optionallval) {sb. Append (string. Format (@"and s.shu_id={0}", Strutil.sqlclean (shu_id))); } sb. Append ("ORDER by SN. Sel_chiname"); returnaccesshelper.datatable (sb.) ToString ());}

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Multiple left join examples for an Access database