Question

如何运行while循环以在SQL中运行动态查询？

Declare @var1 nvarchar(max)
Declare @var2 nvarchar(max)
Declare @var3 nvarchar(max)

While loop ( @var1, @var2, @var3 .... )
 Begin  
     insert into TableA
     exec (@var1) .. - in the loop logic
 End

Answer 1

如果我理解得很好，您希望使用循环来执行一组动态SQL查询。然后，您需要使用表格在它们之间进行迭代，我使用的是变量表，但如果愿意，可以使用临时表

import {
  Directive,
  ElementRef,
  forwardRef,
  HostListener,
  Input,
  Renderer2
} from "@angular/core";
import {
  ControlValueAccessor,
  NG_VALUE_ACCESSOR
} from "@angular/forms";


@Directive({
  selector: "[ebppInputTextTrimmer]",
  providers: [{
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => InputTextTrimmerDirective),
    multi: true
  }]
})
export class InputTextTrimmerDirective implements ControlValueAccessor {
  @Input() prevVal: string;

  @Input() isTrimEnabled: boolean;

  onChange = (_: any) => {
  }

  onTouched = () => {
  }

  constructor(
      private _renderer: Renderer2,
      private _elementRef: ElementRef) {
  }

  writeValue(value: any): void {
    const normalizedValue = value == null ? "" : value;
    this._renderer.setProperty(this._elementRef.nativeElement, "value", normalizedValue);
  }

  registerOnChange(fn: (_: any) => void): void {
    this.onChange = fn;
  }

  registerOnTouched(fn: () => void): void {
    this.onTouched = fn;
  }

  setDisabledState(isDisabled: boolean): void {
    this._renderer.setProperty(this._elementRef.nativeElement, "disabled", isDisabled);
  }

  @HostListener("input", ["$event.target.value"])
  handleInput(inputValue: any): void {
    let valueToProcess = inputValue;
    if (this.isTrimEnabled) {
      valueToProcess = inputValue.trim();
    }

    this.onChange(valueToProcess);
    // set the value that is trimmed in the view
    this._renderer.setProperty(this._elementRef.nativeElement, "value", valueToProcess);
  }

}

如何运行while循环以在SQL中运行动态查询？

1 个答案: