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|
use eframe::egui;
use egui_extras::{Column, TableBuilder};
use postgres::{Client, NoTls};
struct MyApp {
client: Option<Client>,
tables: Vec<String>,
selected_table: Option<String>,
loaded_table: Option<String>,
columns: Vec<String>,
rows: Vec<Vec<String>>,
error: Option<String>,
}
impl Default for MyApp {
fn default() -> Self {
let mut app = Self {
client: None,
tables: Vec::new(),
selected_table: None,
loaded_table: None,
columns: Vec::new(),
rows: Vec::new(),
error: None,
};
app.connect_and_load_tables();
app
}
}
impl MyApp {
fn connect_and_load_tables(&mut self) {
let result = Client::connect(
"host=localhost user=postgres password=test dbname=testdb",
NoTls,
);
match result {
Ok(mut client) => {
let rows = client.query(
"SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'",
&[],
);
match rows {
Ok(rows) => {
self.tables = rows.iter().map(|r| r.get(0)).collect();
}
Err(e) => self.error = Some(format!("Query-Fehler: {e}")),
}
self.client = Some(client);
}
Err(e) => self.error = Some(format!("Verbindungsfehler: {e}")),
}
}
fn load_table_data(&mut self, table: &str) {
if let Some(client) = &mut self.client {
let query = format!("SELECT * FROM \"{table}\" LIMIT 100");
match client.query(&query, &[]) {
Ok(rows) => {
self.columns = rows
.first()
.map(|r| r.columns().iter().map(|c| c.name().to_string()).collect())
.unwrap_or_default();
self.rows = rows
.iter()
.map(|r| (0..r.len()).map(|i| value_to_string(r, i)).collect())
.collect();
}
Err(e) => self.error = Some(format!("Ladefehler: {e}")),
}
}
}
}
impl eframe::App for MyApp {
fn ui(&mut self, ui: &mut egui::Ui, _frame: &mut eframe::Frame) {
egui::CentralPanel::default().show(ui, |ui| {
ui.heading("Postgres Tabellen-Browser");
if let Some(err) = &self.error {
ui.colored_label(egui::Color32::RED, err);
return;
}
egui::ComboBox::from_label("Tabelle")
.selected_text(self.selected_table.clone().unwrap_or_default())
.show_ui(ui, |ui| {
for table in &self.tables {
ui.selectable_value(&mut self.selected_table, Some(table.clone()), table);
}
});
if self.selected_table != self.loaded_table {
if let Some(table) = self.selected_table.clone() {
self.load_table_data(&table);
self.loaded_table = Some(table);
}
}
ui.separator();
TableBuilder::new(ui)
.columns(Column::auto(), self.columns.len())
.header(20.0, |mut header| {
for col in &self.columns {
header.col(|ui| {
ui.strong(col);
});
}
})
.body(|mut body| {
for row in &self.rows {
body.row(18.0, |mut table_row| {
for cell in row {
table_row.col(|ui| {
ui.label(cell);
});
}
});
}
});
});
}
}
use postgres::Row;
fn value_to_string(row: &Row, idx: usize) -> String {
if let Ok(v) = row.try_get::<_, Option<String>>(idx) {
return v.unwrap_or_else(|| "NULL".into());
}
if let Ok(v) = row.try_get::<_, Option<i32>>(idx) {
return v.map(|x| x.to_string()).unwrap_or_else(|| "NULL".into());
}
if let Ok(v) = row.try_get::<_, Option<i64>>(idx) {
return v.map(|x| x.to_string()).unwrap_or_else(|| "NULL".into());
}
if let Ok(v) = row.try_get::<_, Option<bool>>(idx) {
return v.map(|x| x.to_string()).unwrap_or_else(|| "NULL".into());
}
"?".to_string()
}
fn main() -> eframe::Result<()> {
eframe::run_native(
"Postgres Browser",
eframe::NativeOptions::default(),
Box::new(|_cc| Ok(Box::new(MyApp::default()))),
)
}
|
