小编Use*_*123的帖子

我是QtDesigner的新手.我想知道如何使用QT Designer在GUI中插入图像.我正在尝试添加徽标.帮助将不胜感激.

我试图使用PostgreSQL截断模式中的所有表.它显示此错误:

ERROR:  relation "Building" does not exist
CONTEXT:  SQL statement "TRUNCATE TABLE "Building" CASCADE"
PL/pgSQL function truncate_schema(character varying) line 15 at EXECUTE statement

这是我使用的功能:

CREATE OR REPLACE FUNCTION truncate_schema(schema IN VARCHAR) RETURNS void AS $$
DECLARE
    statements CURSOR FOR
        SELECT table_name FROM information_schema.tables
WHERE table_type = 'BASE TABLE' AND table_schema = schema;
BEGIN
    FOR stmt IN statements LOOP
        EXECUTE 'TRUNCATE TABLE ' || quote_ident(stmt.table_name) || ' CASCADE';
    END LOOP;
END;
$$ LANGUAGE plpgsql;

怎么做得好？

我正在使用 ag 网格在我的应用程序之一中显示表格。在应用程序初始化期间加载数据时，我无法看到加载消息。下面是我的代码，

ngOnInit() {
    this.gridOptions =
{
    columnDefs: this.columnDefs,
    overlayLoadingTemplate:
'<span class="ag-overlay-loading-center">Please wait while your rows are loading</span>',
    rowData: [],
    enableCellChangeFlash: true,
    onGridReady: function (params)
    {
        params.api.setRowData(this.rowData);
        params.api.showLoadingOverlay();
        
    },
    onFirstDataRendered(params)
    {
        params.api.sizeColumnsToFit();
    },
    defaultColDef: {
        flex: 1,
        minWidth: 100,
        resizable: true,
        headerCheckboxSelection: this.isFirstColumn,
        checkboxSelection: this.isFirstColumn,
      },
      suppressRowClickSelection: true,
      rowSelection: 'multiple',
};


    //var user_from_date = this.fromDate
    
    
}