我无法从pg gem中获取输入的结果。
require 'pg'
require_relative 'spec/fixtures/database'
client = PG.connect( DB[:pg] )
client.type_map_for_queries = PG::BasicTypeMapForQueries.new(client)
client.type_map_for_results = PG::BasicTypeMapForResults.new(client)
client.exec( %|select * from testme;| ) do |query|
query.each {|r| puts r.inspect }
end
该程序提供输出：
Warning: no type cast defined for type "money" with oid 790. Please cast this type explicitly to TEXT to be safe for future changes.
Warning: no type cast defined for type "numeric" with oid 1700. Please cast this type explicitly to TEXT to be safe for future changes.
{"string"=>"thing", "logical"=>true, "cash"=>"£1.23", "reel"=>"2.34", "day"=>#<Date: 2015-12-31 ((2457388j,0s,0n),+0s,2299161j)>, "float"=>3.45}
所以：布尔值和浮点数和日期（和整数）被转换，但不是数字或金钱类型。
任何人都可以告诉我如何“明确地转换类型”，假设我不想为每个表硬编码解决方案吗？
答案 0 :(得分：3)
对于那些默认情况下想要转换字符串的人来说，这是一个陷阱：
client = PG.connect( DB[:pg] )
map = PG::BasicTypeMapForResults.new(conn)
map.default_type_map = PG::TypeMapAllStrings.new
client.type_map_for_results = map
答案 1 :(得分：2)
与text-ish字段有同样的问题。通过复制编码器并编辑其OID来解决。
text_coder = client.type_map_for_results.coders.find { |c| c.name == 'text' }
new_coder = text_coder.dup.tap { |c| c.oid = 19 } # oid from the warning
conn.type_map_for_results.add_coder(new_coder)
我如何到达那里：如果问题相似但不完全相同，下一个人可能会感兴趣。
我在线阅读其他人谈论type_map_for_results，但他们怎么不知道如何定义编码器。由于在我的案例中它是一个文本字段，我决定尝试克隆现有的字段。我知道我可以在Rails应用程序中找到文本预设，所以我打开了rails console并搜索了：
adapter = ActiveRecord::Base.connection
connection = adapter.instance_variable_get("@connection")
mapping = connection.type_map_for_results
cd mapping # my console of choice is `pry`
ls # spotted a likely getter named `coders`
cd coders # again
ls # spotted getter `name` and setter `oid=`
所以我把代码放在解决方案中。试一试，它有效。
找到并不是那么简单，所以我决定退出潜伏者模式并在SO上分享。因此：感谢@Andreyy带我进入：）
答案 2 :(得分：-1)
public class Xposed implements IXposedHookZygoteInit, IXposedHookLoadPackage {
private static int index, indexMax;
private static boolean first = true;
private static String[] valuesX = {"bla1", "bla2", "bla3", "bla4"};
private Context mCon;
private EditText et;
@Override
public void initZygote(StartupParam startupParam) throws Throwable {
findAndHookMethod(TextView.class, "onFocusChanged", boolean.class, int.class, Rect.class, new XC_MethodHook() {
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
if (param.thisObject instanceof EditText) {
et = (EditText) param.thisObject;
if ((boolean) param.args[0]) {
et.setText("I have focus!!! (1)");
XposedBridge.log("starting quickinsert after focus");
mCon = et.getContext().getApplicationContext();
View.OnKeyListener okl = new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN || keyCode == KeyEvent.KEYCODE_VOLUME_UP)) {
keyPressed(keyCode);
return true;
}
}
return false;
}
};;
et.setOnKeyListener(okl);
}
}
}
});
}
private void keyPressed(int keyCode) {
if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)) {
if (first) {
first = false;
} else {
if (index < indexMax) {
index++;
} else {
index = 0;
}
}
et.setText(valuesX[index]);
XposedBridge.log("keycode down consumed (index " + index + ")");
} else if ((keyCode == KeyEvent.KEYCODE_VOLUME_UP)) {
if (first) {
first = false;
} else {
if (index > 0) {
index--;
} else {
index = indexMax;
}
}
et.setText(valuesX[index]);
XposedBridge.log("keycode up consumed (index " + index + ")");
}
}
}
register_type 0, 'text', PG::TextEncoder::String alias_type 0, 'varchar', 'text'的类方法，我只会玩它们，看看是否有任何变化：
PG::BasicTypeRegistry::CoderMap PG::BasicTypeRegistry::CoderMap.alias_type 0, 'money', 'text' 阅读课堂上的评论似乎没有实现这些和其他一些领域的编码/解码。
您可以考虑使用更高级别的ORM库，例如AvtiveRecord，它可以实现更多类型（money）。