lean into examples

examples/postgres/postgres.go

@@ -0,0 +1,79 @@
+package main
+
+import _ "github.com/bmizerany/pq"
+import "database/sql"
+import "time"
+import "fmt"
+
+func main() {
+    conf := "dbname=gobyexample sslmode=disable"
+    db, openErr := sql.Open("postgres", conf)
+    if openErr != nil {
+        panic(openErr)
+    }
+    defer db.Close()
+    fmt.Println(db)
+
+    createRep, createErr := db.Exec(
+        `CREATE TABLE items
+         (a int, b float, c boolean,
+          d text, e timestamp with time zone)`)
+    if createErr != nil {
+        panic(createErr)
+    }
+    fmt.Println(createRep)
+
+    insertRep, insertErr := db.Exec(
+        `INSERT INTO items VALUES
+         (1, 2.0, false,
+          'string', '2000-01-01T01:02:03Z')`)
+    if insertErr != nil {
+        panic(insertErr)
+    }
+    fmt.Println(insertRep)
+
+    timeFmt := time.RFC3339
+    t1, _ := time.Parse(timeFmt, "2000-04-08T03:02:01Z")
+    t2, _ := time.Parse(timeFmt, "2007-03-02T10:15:45Z")
+    minsertRep, minsertErr := db.Exec(
+        `Insert INTO items VALUES
+         ($1, $2, $3, $4, $5),
+         ($6, $7, $8, $9, $10)`,
+        3, 7.0, true, "more", t1,
+        5, 1.0, false, "less", t2)
+    if minsertErr != nil {
+        panic(minsertErr)
+    }
+    num, _ := minsertRep.RowsAffected()
+    fmt.Println(num)
+
+    rows, selectErr := db.Query("SELECT * FROM items")
+    if selectErr != nil {
+        panic(selectErr)
+    }
+    defer rows.Close()
+    for rows.Next() {
+        var r1 int
+        var r2 float64
+        var r3 bool
+        var r4 string
+        var r5 time.Time
+        rows.Scan(&r1, &r2, &r3, &r4, &r5)
+        fmt.Println(r1, r2, r3, r4, r5)
+    }
+    rowsErr := rows.Err()
+    if rowsErr != nil {
+        panic(rowsErr)
+    }
+
+    dropRep, dropErr := db.Exec("DROP TABLE items")
+    if dropErr != nil {
+        panic(dropErr)
+    }
+    fmt.Println(dropRep)
+}
+
+// todo: connection pooling & concurrency
+// todo: re-connection
+// todo: errors
+// todo: database_url

examples/postgres/postgres.sh

@@ -0,0 +1,10 @@
+# First, be sure that you've installed Postgres
+# and have a server running locally at port 5432.
+
+# Then create an example database.
+$ createdb gobyexample
+
+# Now install the dependencies for the postgres
+# example and try running it.
+$ go get github.com/bmizerany/pq
+$ go run postgres.go