vendor dependencies with dep

vendor/github.com/go-pg/pg/example_placeholders_test.go

@@ -0,0 +1,80 @@
+package pg_test
+
+import (
+	"fmt"
+
+	"github.com/go-pg/pg"
+)
+
+type Params struct {
+	X int
+	Y int
+}
+
+func (p *Params) Sum() int {
+	return p.X + p.Y
+}
+
+// go-pg recognizes `?` in queries as placeholders and replaces them
+// with parameters when queries are executed. `?` can be escaped with backslash.
+// Parameters are escaped before replacing according to PostgreSQL rules.
+// Specifically:
+//   - all parameters are properly quoted against SQL injections;
+//   - null byte is removed;
+//   - JSON/JSONB gets `\u0000` escaped as `\\u0000`.
+func Example_placeholders() {
+	var num int
+
+	// Simple params.
+	_, err := db.Query(pg.Scan(&num), "SELECT ?", 42)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("simple:", num)
+
+	// Indexed params.
+	_, err = db.Query(pg.Scan(&num), "SELECT ?0 + ?0", 1)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("indexed:", num)
+
+	// Named params.
+	params := &Params{
+		X: 1,
+		Y: 1,
+	}
+	_, err = db.Query(pg.Scan(&num), "SELECT ?x + ?y + ?Sum", params)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("named:", num)
+
+	// Global params.
+	_, err = db.WithParam("z", 1).Query(pg.Scan(&num), "SELECT ?x + ?y + ?z", params)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("global:", num)
+
+	// Model params.
+	var tableName, tableAlias, columns string
+	_, err = db.Model(&Params{}).Query(
+		pg.Scan(&tableName, &tableAlias, &columns),
+		"SELECT '?TableName', '?TableAlias', '?Columns'",
+	)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("table name:", tableName)
+	fmt.Println("table alias:", tableAlias)
+	fmt.Println("columns:", columns)
+
+	// Output: simple: 42
+	// indexed: 2
+	// named: 4
+	// global: 3
+	// table name: "params"
+	// table alias: "params"
+	// columns: "x", "y"
+}