working on re-arranging

076-postgres/076-postgres.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	_ "github.com/bmizerany/pq"
+	"database/sql"
+	"fmt"
+	"time"
+)
+
+func main() {
+	db, openErr := sql.Open("postgres", "dbname=gobyexample sslmode=disable")
+	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)
+
+	t1, _ := time.Parse(time.RFC3339, "2000-04-08T03:02:01Z")
+	t2, _ := time.Parse(time.RFC3339, "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)
+}
+
+// == running
+// # start postgres
+// $ createdb gobyexample
+// $ cd xx-postgres
+// $ go get
+// $ ./xx-postgres
+
+// == todo
+// connection pooling
+// concurrency
+// re-connection
+// errors
+// explain