storage/sql: add a SQL storage implementation

This change adds support for SQLite3, and Postgres.

storage/sql/sql_test.go

@@ -0,0 +1,55 @@
+package sql
+
+import "testing"
+
+func TestTranslate(t *testing.T) {
+	tests := []struct {
+		testCase string
+		flavor   flavor
+		query    string
+		exp      string
+	}{
+		{
+			"sqlite3 query bind replacement",
+			flavorSQLite3,
+			`select foo from bar where foo.zam = $1;`,
+			`select foo from bar where foo.zam = ?;`,
+		},
+		{
+			"sqlite3 query bind replacement at newline",
+			flavorSQLite3,
+			`select foo from bar where foo.zam = $1`,
+			`select foo from bar where foo.zam = ?`,
+		},
+		{
+			"sqlite3 query true",
+			flavorSQLite3,
+			`select foo from bar where foo.zam = true`,
+			`select foo from bar where foo.zam = 1`,
+		},
+		{
+			"sqlite3 query false",
+			flavorSQLite3,
+			`select foo from bar where foo.zam = false`,
+			`select foo from bar where foo.zam = 0`,
+		},
+		{
+			"sqlite3 bytea",
+			flavorSQLite3,
+			`"connector_data" bytea not null,`,
+			`"connector_data" blob not null,`,
+		},
+		{
+			"sqlite3 now",
+			flavorSQLite3,
+			`now(),`,
+			`date('now'),`,
+		},
+	}
+
+	for _, tc := range tests {
+		if got := tc.flavor.translate(tc.query); got != tc.exp {
+			t.Errorf("%s: want=%q, got=%q", tc.testCase, tc.exp, got)
+		}
+	}
+}