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Projection 1
[MongoDB] ํ”„๋กœ์ ์…˜ (Projection) ์ด๋ž€? projection query ์‚ฌ์šฉ๋ฒ•

Intro MongoDB์˜ ํ”„๋กœ์ ์…˜์— ๋Œ€ํ•ด ์•Œ์•„๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค. What is projection? MongoDB์—์„œ projection(ํ”„๋กœ์ ์…˜)์€ ํ•œ document ์ „์ฒด๋ฅผ ์„ ํƒํ•˜๋Š” ๊ฒƒ์ด ์•„๋‹ˆ๋ผ, ํŠน์ • ํ•„์š”ํ•œ ๋ฐ์ดํ„ฐ๋ฅผ ์„ ํƒํ•˜๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด document๊ฐ€ 3๊ฐœ์˜ ํ•„๋“œ๋ฅผ ๊ฐ–๊ณ  ์žˆ์„ ๋•Œ, 1๊ฐœ์˜ ํ•„๋“œ๋งŒ ๋ณด์—ฌ์ฃผ๊ณ  ์‹ถ๋‹ค๋ฉด 1๊ฐœ์˜ ํ•„๋“œ์— ๋Œ€ํ•ด ํ”„๋กœ์ ์…˜์„ ๊ฑธ์–ด์ฃผ๋ฉด ๋ฉ๋‹ˆ๋‹ค. Projection parameter MongoDB์—์„œ find๋กœ query๋ฅผ ๊ฑธ์–ด์ค„ ๋•Œ ํŒŒ๋ผ๋ฏธํ„ฐ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์Šต๋‹ˆ๋‹ค. db.$(collection name).find( {filter condition} , {projection parameter}) Example ๋‹ค์Œ์€ projectType์ด "GO"์ด๋ฉด์„œ, projectName๊ณผ, st..
Database/monogodb 2022.12.20
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