form view infrastructure, loading row from DB

packages/datalib/src/TableFormViewDisplay.ts

@@ -0,0 +1,62 @@
+import { FormViewDisplay } from './FormViewDisplay';
+import _ from 'lodash';
+import { GridDisplay, ChangeCacheFunc, DisplayColumn, DisplayedColumnInfo, ChangeConfigFunc } from './GridDisplay';
+import { TableInfo, EngineDriver, ViewInfo, ColumnInfo, NamedObjectInfo, DatabaseInfo } from 'dbgate-types';
+import { GridConfig, GridCache, createGridCache } from './GridConfig';
+import { Expression, Select, treeToSql, dumpSqlSelect, mergeConditions, Condition } from 'dbgate-sqltree';
+import { filterName } from './filterName';
+import { TableGridDisplay } from './TableGridDisplay';
+
+export class TableFormViewDisplay extends FormViewDisplay {
+  public table: TableInfo;
+  // use utility functions from GridDisplay and publish result in FromViewDisplat interface
+  private gridDisplay: TableGridDisplay;
+
+  constructor(
+    public tableName: NamedObjectInfo,
+    driver: EngineDriver,
+    config: GridConfig,
+    setConfig: ChangeConfigFunc,
+    cache: GridCache,
+    setCache: ChangeCacheFunc,
+    dbinfo: DatabaseInfo
+  ) {
+    super(config, setConfig, cache, setCache, driver, dbinfo);
+    this.gridDisplay = new TableGridDisplay(tableName, driver, config, setConfig, cache, setCache, dbinfo);
+
+    this.isLoadedCorrectly = this.gridDisplay.isLoadedCorrectly;
+    this.columns = this.gridDisplay.columns;
+  }
+
+  getPrimaryKeyCondition(): Condition {
+    if (!this.config.formViewKey) return null;
+    return {
+      conditionType: 'and',
+      conditions: _.keys(this.config.formViewKey).map((columnName) => ({
+        conditionType: 'binary',
+        operator: '=',
+        left: {
+          exprType: 'column',
+          columnName,
+          source: {
+            alias: 'basetbl',
+          },
+        },
+        right: {
+          exprType: 'value',
+          value: this.config.formViewKey[columnName],
+        },
+      })),
+    };
+  }
+
+  getCurrentRowQuery() {
+    if (!this.driver) return null;
+    const select = this.gridDisplay.createSelect();
+    if (!select) return null;
+    select.topRecords = 1;
+    select.where = mergeConditions(select.where, this.getPrimaryKeyCondition());
+    const sql = treeToSql(this.driver, select, dumpSqlSelect);
+    return sql;
+  }
+}