▁T cl ▁ 8 . 6 , ▁is ▁a ▁common ▁database ▁access ▁interface ▁for ▁T cl ▁scripts . ▁It ▁currently ▁supports ▁drivers ▁for ▁accessing ▁MySQL , ▁O DBC , ▁Post gre SQL ▁and ▁SQLite ▁databases . ▁More ▁are ▁planned ▁for ▁the ▁future . ▁Access ▁to ▁databases ▁is ▁also ▁supported ▁through ▁database - specific ▁extensions , ▁of ▁which ▁there ▁are ▁many ▁available . ▁ ▁See ▁also ▁▁▁ ▁E gg drop ▁ ▁Ex pect ▁ ▁T cl X ▁ ▁T k des k ▁ ▁Com parison ▁of ▁T cl ▁integrated ▁development ▁environments ▁ ▁Com parison ▁of ▁programming ▁languages ▁ ▁List ▁of ▁programming ▁languages ▁ ▁Environment ▁Mod ules ▁ ▁References ▁ ▁Further ▁reading ▁▁▁▁▁▁▁ ▁Br ent ▁B . ▁Wel ch , ▁Pract ical ▁Program ming ▁in ▁T cl ▁and ▁T k , ▁Pr ent ice ▁Hall , ▁Upper ▁S addle ▁River , ▁N J , ▁USA , ▁, ▁ 2 0 0 3 ▁ ▁J ▁Ad rian ▁Z immer , ▁T cl / T k ▁for ▁Program mers , ▁IE EE ▁Computer ▁Society , ▁distributed ▁by ▁John ▁W iley ▁and ▁S ons , ▁, ▁ 1 9 9 8 ▁ ▁Mark ▁Harrison ▁and ▁Michael ▁Mc L enn an , ▁Effect ive ▁T cl / T k ▁Program ming , ▁Add ison - W es ley , ▁Reading , ▁MA , ▁USA , ▁, ▁ 1 9 9 8 ▁ ▁Bert ▁Whe eler , ▁T cl / T k ▁ 8 . 5 ▁Program ming ▁Cook book , ▁Pack t ▁Publishing , ▁B irmingham , ▁England ,