Storing Business Logic in Database

Question

We want to write some business logic rules that work on top of certain data to build reports. Not sure which is the best to store them in the database MySQL.

Answer 1

CREATE TABLE businessRule (
  id INT NOT NULL ,
  name VARCHAR(32) NOT NULL ,
  description VARCHAR(255) NULL ,
  statement VARCHAR(255) NOT NULL ,
  PRIMARY KEY (id) )
ENGINE = InnoDB;

CREATE TABLE leftOperand (
  id INT NOT NULL ,
  value VARCHAR(255) NOT NULL ,
  PRIMARY KEY (id) )
ENGINE = InnoDB;

CREATE TABLE ruleItem (
  id INT NOT NULL ,
  businessRuleId INT NOT NULL ,
  operator ENUM('if','and','or','not') NOT NULL ,
  loperand INT NOT NULL ,
  comparator ENUM('<','=','>') NOT NULL ,
  roperand VARCHAR(255) NOT NULL ,
  roperand_ispercentage TINYINT(1)  NOT NULL ,
  PRIMARY KEY (id) ,
  INDEX businessRule_FK (businessRuleId ASC) ,
  INDEX leftOperand_FK (loperand ASC) ,
  CONSTRAINT businessRule_FK
    FOREIGN KEY (businessRuleId )
    REFERENCES mydb.businessRule (id )
    ON DELETE CASCADE
    ON UPDATE RESTRICT,
  CONSTRAINT leftOperand_FK
    FOREIGN KEY (loperand )
    REFERENCES mydb.leftOperand (id )
    ON DELETE RESTRICT
    ON UPDATE RESTRICT)
ENGINE = InnoDB;