基于来自其他表的值的条件默认约束

Question

我有三个桌子

class Form extends React.Component {
  constructor(props, context) {
    super(props, context);

    this.handleChangeFname = this.handleChange.bind(this);
    this.handleChangeLname = this.handleChange.bind(this);
    this.handleChangeEmail = this.handleChange.bind(this);
    this.handleChangePhone = this.handleChange.bind(this);

    this.state = {
      value: null
    };
  }

  getValidationStateFname() {
    const fname = this.state.value;
    if (this.state.value === null) return null;
    else if (!/^[a-zA-Z]*$/.test(fname)) return 'error';
    else if (/^[a-zA-Z]*$/.test(fname)) return 'success';
  }
  getValidationStateLname() {
    const lname = this.state.value;
    if (this.state.value === null) return null;
    else if (!/^[a-zA-Z]*$/.test(lname)) return 'error';
    else if (/^[a-zA-Z]*$/.test(lname)) return 'success';
  }
  getValidationStateEmail() {
    const email = this.state.value;
    if (this.state.value === null) return null;
    else if (!/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(email)) return 'error';
    else if (/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(email)) return 'success';
  }
  getValidationStatePhone() {
    const phone = this.state.value;
    if (this.state.value === null) return null;
    else if (!/^[0-9]+$/.test(phone)) return 'error';
    else if (/^[0-9]+$/.test(phone)) return 'success';
  }

  handleChange(fname) {
    this.setState({ value: fname.target.value });
  }

  handleChange(lname) {
    this.setState({ value: lname.target.value });
  }

  handleChange(email) {
    this.setState({ value: email.target.value });
  }

  handleChange(phone) {
    this.setState({ value: phone.target.value });
  }

  render() {
    return (
      <form>
      <Grid>
        <Row className="show-grid">
          <Col sm={9} md={6}>
          <FormGroup
            controlId="formBasicText"
            validationState={this.getValidationStateFname()}
            >
            <FormControl
            type="text"
            value={this.state.value}
            placeholder="First Name"
            onChange={this.handleChangeFname}
            />
            <FormControl.Feedback />
            </FormGroup>
          </Col>
          <Col sm={9} md={6}>
          <FormGroup
          controlId="formBasicText"
          validationState={this.getValidationStateLname()}
          >
          <FormControl
            type="text"
            value={this.state.value}
            placeholder="Last Name"
            onChange={this.handleChangeLname}
          />
          <FormControl.Feedback />
          </FormGroup>
          </Col>
          <Col sm={9} md={6}>
          <FormGroup
          controlId="formBasicText"
          validationState={this.getValidationStateEmail()}
          >
          <FormControl
            type="text"
            value={this.state.value}
            placeholder="E-mail"
            onChange={this.handleChangeEmail}
          />
          <FormControl.Feedback />
          </FormGroup>
          </Col>
          <Col sm={9} md={6}>
          <FormGroup
          controlId="formBasicText"
          validationState={this.getValidationStatePhone()}
          >
          <FormControl
            type="text"
            value={this.state.value}
            placeholder="Phone Number"
            onChange={this.handleChangePhone}
          />
          <FormControl.Feedback />
          </FormGroup>
        </Col>
        </Row>
        </Grid>
      </form>

    );
  }
}

export default Form;

每次我在TAD表中插入一条记录时，我都需要将当前日期放在--- TAI --- tai_id int dai_id int --- DAI --- dai_id int DaiType varchar(1) --- TAD --- tad_id int tai_id int StoreDate DateTime <<--default constraint in this field and table 字段中，但是，仅当StoreDate表中的字段DaiType是= DAI。对于'S'表中DaiType字段中的所有其他值，DAI中的值应默认为null。

如何仅使用约束条件来完成？我不想编写触发器或任何类型的后端作业。