Add query history navigation shortcuts and functionality

README.md

@@ -15,6 +15,7 @@ DBee is a terminal-based TUI application written in Go, designed for connecting
 - List database tables and views 
 - View table structures and browse data 
 - Execute SQL queries 
+- SQL query history **(New!)**
 - Fixed columns in results table 
 
 [](https://github.com/murat-cileli/dbee/assets/6532000/d9d2cd86-e505-471d-91e4-d56cf8d34725) 
@@ -51,6 +52,8 @@ DBee is a terminal-based TUI application written in Go, designed for connecting
 **Main Page -> Query Pane** 
 <kbd>Alt</kbd> + <kbd>Q</kbd> : Focus query pane 
 <kbd>Alt</kbd> + <kbd>Enter</kbd> : Execute SQL query 
+<kbd>Alt</kbd> + <kbd>Up</kbd> : Go back in query history 
+<kbd>Alt</kbd> + <kbd>Down</kbd> : Go forward in query history 
 <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>V</kbd> : Paste 
 <kbd>Ctrl</kbd> + <kbd>Z</kbd> : Undo 
 

src/database.go

@@ -52,10 +52,13 @@ func (database *databaseType) Connect() error {
  return nil
 }
 
-func (database *databaseType) Query(query string) (*sql.Rows, error) {
+func (database *databaseType) Query(query string, addToHistory bool) (*sql.Rows, error) {
  rows, err := database.DB.Query(query)
  if err != nil {
  pageAlert.show(err.Error(), "error")
+ } else if addToHistory {
+ queryHistory.add(query)
+ queryHistory.resetIndex()
  }
 
  return rows, err
@@ -68,5 +71,5 @@ func (database *databaseType) getTables() (*sql.Rows, error) {
  } else if database.Driver == "postgres" {
  query = "SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname != 'pg_catalog' AND schemaname != 'information_schema'"
  }
- return database.Query(query)
+ return database.Query(query, false)
 }

src/page_main.go

@@ -65,10 +65,20 @@ func (pageMain *pageMainType) build() {
  textAreaQuery.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
  if event.Key() == tcell.KeyEnter && event.Modifiers() == tcell.ModAlt {
  event = nil
- results, err := database.Query(textAreaQuery.GetText())
+ results, err := database.Query(textAreaQuery.GetText(), true)
  if err == nil {
  pageMain.loadQueryResults(results)
  }
+ } else if event.Key() == tcell.KeyUp && event.Modifiers() == tcell.ModAlt {
+ queryHistory := queryHistory.back()
+ if queryHistory != "" {
+ textAreaQuery.SetText(queryHistory, true)
+ }
+ } else if event.Key() == tcell.KeyDown && event.Modifiers() == tcell.ModAlt {
+ queryHistory := queryHistory.forward()
+ if queryHistory != "" {
+ textAreaQuery.SetText(queryHistory, true)
+ }
  }
  return event
  })
@@ -102,15 +112,15 @@ func (pageMain *pageMainType) describeDatabaseObject() {
  } else if database.DriverName == "PostgreSQL" {
  query = "SELECT * FROM information_schema.columns WHERE table_name = '" + selectedObject + "'"
  }
- results, err := database.Query(query)
+ results, err := database.Query(query, false)
  if err == nil {
  pageMain.loadQueryResults(results)
  }
 }
 
 func (pageMain *pageMainType) browseDatabaseObject() {
  selectedObject, _ := listDatabaseObjects.GetItemText(listDatabaseObjects.GetCurrentItem())
- results, err := database.Query("SELECT * FROM " + selectedObject + " LIMIT 10")
+ results, err := database.Query("SELECT * FROM "+selectedObject+" LIMIT 10", false)
  if err == nil {
  pageMain.loadQueryResults(results)
  }

src/query_history.go

@@ -0,0 +1,38 @@
+package main
+
+type queryHistoryType struct {
+ history []string
+ index int
+}
+
+var queryHistory queryHistoryType
+
+func (queryHistory *queryHistoryType) back() string {
+ if queryHistory.getUpperIndex() > 0 && queryHistory.index > 0 {
+ queryHistory.index--
+ return queryHistory.history[queryHistory.index]
+ }
+ queryHistory.index = 0
+ return ""
+}
+
+func (queryHistory *queryHistoryType) forward() string {
+ if queryHistory.index < queryHistory.getUpperIndex() {
+ queryHistory.index++
+ return queryHistory.history[queryHistory.index]
+ }
+ queryHistory.resetIndex()
+ return ""
+}
+
+func (queryHistory *queryHistoryType) add(historyEntry string) {
+ queryHistory.history = append(queryHistory.history, historyEntry)
+}
+
+func (queryHistory *queryHistoryType) getUpperIndex() int {
+ return len(queryHistory.history) - 1
+}
+
+func (queryHistory *queryHistoryType) resetIndex() {
+ queryHistory.index = queryHistory.getUpperIndex()
+}