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@@ -0,0 +1,68 @@
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+CREATE TABLE IF NOT EXISTS var_type (
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+ slabel CHAR(1) UNIQUE PRIMARY KEY,
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+ label VARCHAR(10) UNIQUE,
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+ type VARCHAR(10) NOT NULL,
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+ start_address INT NOT NULL DEFAULT 0,
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+ end_address INT NOT NULL DEFAULT 250
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+);
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+
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+CREATE TABLE IF NOT EXISTS variable (
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+ type CHAR(1) NOT NULL,
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+ address INT NOT NULL,
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+ unit VARCHAR(5) NULL,
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+ last_update INT NULL,
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+
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+
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+ FOREIGN KEY (type) REFERENCES var_type(slabel)
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+ ON DELETE CASCADE,
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+ PRIMARY KEY(type, address)
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+);
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+
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+CREATE TABLE IF NOT EXISTS var_value (
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+ type CHAR(1) NOT NULL,
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+ address INT NOT NULL,
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+ time INT DEFAULT CURRENT_TIMESTAMP,
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+ value INT NOT NULL,
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+
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+ FOREIGN KEY (type) REFERENCES variable(type)
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+ ON DELETE CASCADE,
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+ FOREIGN KEY (address) REFERENCES variable(address)
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+ ON DELETE CASCADE,
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+ PRIMARY KEY(type, address, time)
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+);
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+
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+INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
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+ 'A', 'Analog', 'float', 1, 125);
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+INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
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+ 'I', 'Integer', 'int', 5002, 5002 + 125);
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+INSERT INTO var_type (slabel, label, type, start_address, end_address) VALUES (
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+ 'D', 'Digital', 'bool', 1, 125);
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+
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+CREATE TRIGGER variable_insert BEFORE INSERT ON var_value
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+FOR EACH ROW
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+WHEN
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+ NOT EXISTS (
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+ SELECT MAX(time) FROM var_value
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+ WHERE
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+ NEW.type = type
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+ AND
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+ NEW.address = address
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+ AND
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+ NEW.value = value
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+ )
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+BEGIN
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+ INSERT INTO var_value
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+ (type, address, value)
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+ VALUES (NEW.type, NEW.address, NEW.value);
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+END;
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+
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+CREATE TRIGGER variable_last_update AFTER INSERT ON var_value
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+FOR EACH ROW
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+BEGIN
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+ UPDATE variable
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+ SET last_update = NEW.time
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+ WHERE
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+ type = NEW.type
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+ AND
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+ address = NEW.address;
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+END;
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