51 lines
1.7 KiB
MySQL
51 lines
1.7 KiB
MySQL
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CREATE TABLE IF NOT EXISTS comments (
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id BIGSERIAL PRIMARY KEY,
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parent_post_id BIGINT NOT NULL,
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parent_comment_id BIGINT,
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author_user_id BIGINT NOT NULL,
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content TEXT NOT NULL,
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upvotes INTEGER NOT NULL DEFAULT 0,
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downvotes INTEGER NOT NULL DEFAULT 0,
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created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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FOREIGN KEY (parent_post_id) REFERENCES posts (id),
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FOREIGN KEY (parent_comment_id) REFERENCES comments (id),
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FOREIGN KEY (author_user_id) REFERENCES users (id)
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);
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-- Create a function to set created_at and updated_at on INSERT
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CREATE OR REPLACE FUNCTION comments_set_timestamps_on_insert() RETURNS TRIGGER AS $$
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BEGIN
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NEW.created_at = NOW();
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NEW.updated_at = NOW();
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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-- Create a trigger to call the function after INSERT
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CREATE TRIGGER comments_set_timestamps_on_insert
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BEFORE INSERT ON posts
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FOR EACH ROW
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EXECUTE FUNCTION set_timestamps_on_insert();
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-- Create a function to set updated_at on UPDATE
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CREATE OR REPLACE FUNCTION comments_set_updated_at() RETURNS TRIGGER AS $$
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BEGIN
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NEW.updated_at = NOW();
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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-- Create a trigger to call the function after UPDATE
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CREATE TRIGGER comments_set_updated_at
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BEFORE UPDATE ON posts
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FOR EACH ROW
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EXECUTE FUNCTION comments_set_updated_at();
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CREATE INDEX comments_parent_post_id_index ON comments (parent_post_id);
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CREATE INDEX comments_parent_comment_id_index ON comments (parent_comment_id);
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CREATE INDEX comments_user_id_index ON comments (author_user_id);
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-- CREATE INDEX posts_user_id_index ON posts (user_id);
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-- CREATE INDEX posts_id_index ON posts (id);
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-- CREATE INDEX idx_created_at_desc ON posts (created_at DESC);
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