方法超出编译器指令限制
Method exceeds compiler instruction limit
在我写这个问题之前，我搜索了所有建议的答案，“Whosebug”向我展示了但没有适合我的情况。
我的问题：
我编写了 Room migration 以从 table 复制旧数据并将其添加到另一个 table，我需要指定查询中的所有列。我有大约 130 列。
database.execSQL("INSERT INTO newTable(col1, ..n) SELECT col1, .... coln FROM oldTable")
当我执行迁移时，出现此错误：
method exceeds compiler instruction limit: 16602 in androidx.room.RoomOpenHelper$ValidationResult
谢谢你的帮助。
运行 使用 150 列（151 包括 id 列）的测试，因此 :-
2022-05-11 06:29:50.050 16308-16308/a.a.so72188145javaroommaxcolumns D/INSERTSQL: INSERT INTO newtable (id,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23,col24,col25,col26,col27,col28,col29,col30,col31,col32,col33,col34,col35,col36,col37,col38,col39,col40,col41,col42,col43,col44,col45,col46,col47,col48,col49,col50,col51,col52,col53,col54,col55,col56,col57,col58,col59,col60,col61,col62,col63,col64,col65,col66,col67,col68,col69,col70,col71,col72,col73,col74,col75,col76,col77,col78,col79,col80,col81,col82,col83,col84,col85,col86,col87,col88,col89,col90,col91,col92,col93,col94,col95,col96,col97,col98,col99,col100,col101,col102,col103,col104,col105,col106,col107,col108,col109,col110,col111,col112,col113,col114,col115,col116,col117,col118,col119,col120,col121,col122,col123,col124,col125,col126,col127,col128,col129,col130,col131,col132,col133,col134,col135,col136,col137,col138,col139,col140,col141,col142,col143,col144,col145,col146,col147,col148,col149,col150) SELECT id,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23,col24,col25,col26,col27,col28,col29,col30,col31,col32,col33,col34,col35,col36,col37,col38,col39,col40,col41,col42,col43,col44,col45,col46,col47,col48,col49,col50,col51,col52,col53,col54,col55,col56,col57,col58,col59,col60,col61,col62,col63,col64,col65,col66,col67,col68,col69,col70,col71,col72,col73,col74,col75,col76,col77,col78,col79,col80,col81,col82,col83,col84,col85,col86,col87,col88,col89,col90,col91,col92,col93,col94,col95,col96,col97,col98,col99,col100,col101,col102,col103,col104,col105,col106,col107,col108,col109,col110,col111,col112,col113,col114,col115,col116,col117,col118,col119,col120,col121,col122,col123,col124,col125,col126,col127,col128,col129,col130,col131,col132,col133,col134,col135,col136,col137,col138,col139,col140,col141,col142,col143,col144,col145,col146,col147,col148,col149,col150 FROM oldtable;
工作正常（Room 2.5.0-aplha01 和 Android 30 模拟器）。我怀疑问题可能不是列数而是 SQL.
中的其他地方
- 上面的SQL是从日志中提取出来的，完全按照当时使用的方式输出到日志中（见下面的测试代码）。
A work-around 如果您有可以为空的列并且它们的数量足以规避此问题。有一个 INSERT 插入可管理数量的列，允许其他列默认为空值，然后进行 1 个或多个更新以应用后续值来覆盖空值。
另一个 work-around 可能是将所有列 SELECT * .... 提取到 Cursor 中，然后从 Cursor 构建一个 ContentValues（基于每行）并使用 SupportSQliteDatabase的insert方法。大致如下：-
Cursor csr = database.query("SELECT * FROM oldtable");
database.beginTransaction();
ContentValues cv = new ContentValues();
while (csr.moveToNext()) {
cv.clear();
for (int i=0; i < csr.getColumnCount(); i++) {
if (!csr.getColumnName(i).equals("col133")) { //<<<<< skip col133 as an example
cv.put(csr.getColumnName(i),csr.getString(i));
}
}
database.insert("newTable", SQLiteDatabase.CONFLICT_IGNORE,cv);
}
database.setTransactionSuccessful();
database.endTransaction();
用于测试的完整代码
- 请注意，两者之间的唯一变化是版本号。所以最初代码是 运行（卸载应用程序后）版本 1（因此没有迁移）。要测试它只是一个问题，然后将版本更改为 2.
@Entity注解classOldTable:-
@Entity
class OldTable {
@PrimaryKey
Long id=null;
String col1;
String col2;
String col3;
.... (i.e. all missing numbers)
String col147;
String col148;
String col149;
String col150;
}
@Dao注解接口（实际没有用到）AllDao
@Dao
interface AllDao {
@Insert(onConflict = OnConflictStrategy.IGNORE)
long insert(OldTable oldTable);
}
@Database 注解 class TheDatabase :-
@Database(entities = {OldTable.class},version = MainActivity.DATABASE_VERSION,exportSchema = false)
abstract class TheDatabase extends RoomDatabase {
abstract AllDao getAllDao();
private static volatile TheDatabase INSTANCE = null;
static TheDatabase getINSTANCE(Context context) {
if (INSTANCE == null) {
INSTANCE = Room.databaseBuilder(context,TheDatabase.class,MainActivity.DATABASE_NAME)
.allowMainThreadQueries()
.addMigrations(MIGRATION_1_2)
.build();
}
return INSTANCE;
}
static Migration MIGRATION_1_2 = new Migration(1,2) {
@Override
public void migrate(@NonNull SupportSQLiteDatabase database) {
StringBuilder sb = new StringBuilder();
StringBuilder sb2 = new StringBuilder();
ArrayList<String> columns = new ArrayList<>();
for (int i=0; i < MainActivity.column_count;i++) {
columns.add("col" + (i+1));
if (i>0) {
sb.append(",");
sb2.append(",");
}
sb.append(columns.get(i));
sb2.append(columns.get(i)).append(" TEXT");
}
String columnsAsCSV = sb.toString();
String columnDefs = sb2.toString();
database.execSQL("DROP TABLE IF EXISTS newtable");
database.execSQL("CREATE TABLE IF NOT EXISTS newtable (id INTEGER PRIMARY KEY," + columnDefs + ");");
String insertSQL = "INSERT INTO newtable (id,"+columnsAsCSV+") SELECT id,"+columnsAsCSV+" FROM oldtable;";
Log.d("INSERTSQL",insertSQL);
database.execSQL(insertSQL);
}
};
}
最后把它们放在一起 MainActivity :-
public class MainActivity extends AppCompatActivity {
public static final String DATABASE_NAME = "the_database.db";
public static final int DATABASE_VERSION = 2;
public static final int column_count = 150;
private ArrayList<String> column_names = new ArrayList<>();
private String allColumnsAsCSV = "";
TheDatabase db;
AllDao dao;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BuildColumns();
db = TheDatabase.getINSTANCE(this);
dao = db.getAllDao();
SupportSQLiteDatabase supdb = db.getOpenHelper().getWritableDatabase();
StringBuilder sb = new StringBuilder();
for (int i=0;i < 100; i++) {
sb = new StringBuilder();
sb.append("INSERT INTO oldtable (").append(allColumnsAsCSV).append(") VALUES(");
for(int ii=0;ii<column_count;ii++) {
if (ii > 0) {
sb.append(",");
}
sb.append("'").append(column_names.get(ii)).append(i).append(ii).append("'");
}
sb.append(")");
supdb.execSQL(sb.toString());
}
}
void BuildColumns() {
column_names.clear();
allColumnsAsCSV = "";
StringBuilder sb = new StringBuilder();
for (int i=0; i < column_count; i++) {
column_names.add("col" + (i+1));
if (i>0) {
sb.append(",");
}
sb.append(column_names.get(i));
}
allColumnsAsCSV = sb.toString();
}
}
在我写这个问题之前，我搜索了所有建议的答案，“Whosebug”向我展示了但没有适合我的情况。
我的问题： 我编写了 Room migration 以从 table 复制旧数据并将其添加到另一个 table，我需要指定查询中的所有列。我有大约 130 列。
database.execSQL("INSERT INTO newTable(col1, ..n) SELECT col1, .... coln FROM oldTable")
当我执行迁移时，出现此错误：
method exceeds compiler instruction limit: 16602 in androidx.room.RoomOpenHelper$ValidationResult
谢谢你的帮助。
运行 使用 150 列（151 包括 id 列）的测试，因此 :-
2022-05-11 06:29:50.050 16308-16308/a.a.so72188145javaroommaxcolumns D/INSERTSQL: INSERT INTO newtable (id,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23,col24,col25,col26,col27,col28,col29,col30,col31,col32,col33,col34,col35,col36,col37,col38,col39,col40,col41,col42,col43,col44,col45,col46,col47,col48,col49,col50,col51,col52,col53,col54,col55,col56,col57,col58,col59,col60,col61,col62,col63,col64,col65,col66,col67,col68,col69,col70,col71,col72,col73,col74,col75,col76,col77,col78,col79,col80,col81,col82,col83,col84,col85,col86,col87,col88,col89,col90,col91,col92,col93,col94,col95,col96,col97,col98,col99,col100,col101,col102,col103,col104,col105,col106,col107,col108,col109,col110,col111,col112,col113,col114,col115,col116,col117,col118,col119,col120,col121,col122,col123,col124,col125,col126,col127,col128,col129,col130,col131,col132,col133,col134,col135,col136,col137,col138,col139,col140,col141,col142,col143,col144,col145,col146,col147,col148,col149,col150) SELECT id,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,col16,col17,col18,col19,col20,col21,col22,col23,col24,col25,col26,col27,col28,col29,col30,col31,col32,col33,col34,col35,col36,col37,col38,col39,col40,col41,col42,col43,col44,col45,col46,col47,col48,col49,col50,col51,col52,col53,col54,col55,col56,col57,col58,col59,col60,col61,col62,col63,col64,col65,col66,col67,col68,col69,col70,col71,col72,col73,col74,col75,col76,col77,col78,col79,col80,col81,col82,col83,col84,col85,col86,col87,col88,col89,col90,col91,col92,col93,col94,col95,col96,col97,col98,col99,col100,col101,col102,col103,col104,col105,col106,col107,col108,col109,col110,col111,col112,col113,col114,col115,col116,col117,col118,col119,col120,col121,col122,col123,col124,col125,col126,col127,col128,col129,col130,col131,col132,col133,col134,col135,col136,col137,col138,col139,col140,col141,col142,col143,col144,col145,col146,col147,col148,col149,col150 FROM oldtable;
工作正常（Room 2.5.0-aplha01 和 Android 30 模拟器）。我怀疑问题可能不是列数而是 SQL.
中的其他地方- 上面的SQL是从日志中提取出来的，完全按照当时使用的方式输出到日志中（见下面的测试代码）。
A work-around 如果您有可以为空的列并且它们的数量足以规避此问题。有一个 INSERT 插入可管理数量的列，允许其他列默认为空值，然后进行 1 个或多个更新以应用后续值来覆盖空值。
另一个 work-around 可能是将所有列 SELECT * .... 提取到 Cursor 中，然后从 Cursor 构建一个 ContentValues（基于每行）并使用 SupportSQliteDatabase的insert方法。大致如下：-
Cursor csr = database.query("SELECT * FROM oldtable");
database.beginTransaction();
ContentValues cv = new ContentValues();
while (csr.moveToNext()) {
cv.clear();
for (int i=0; i < csr.getColumnCount(); i++) {
if (!csr.getColumnName(i).equals("col133")) { //<<<<< skip col133 as an example
cv.put(csr.getColumnName(i),csr.getString(i));
}
}
database.insert("newTable", SQLiteDatabase.CONFLICT_IGNORE,cv);
}
database.setTransactionSuccessful();
database.endTransaction();
用于测试的完整代码
- 请注意，两者之间的唯一变化是版本号。所以最初代码是 运行（卸载应用程序后）版本 1（因此没有迁移）。要测试它只是一个问题，然后将版本更改为 2.
@Entity注解classOldTable:-
@Entity
class OldTable {
@PrimaryKey
Long id=null;
String col1;
String col2;
String col3;
.... (i.e. all missing numbers)
String col147;
String col148;
String col149;
String col150;
}
@Dao注解接口（实际没有用到）AllDao
@Dao
interface AllDao {
@Insert(onConflict = OnConflictStrategy.IGNORE)
long insert(OldTable oldTable);
}
@Database 注解 class TheDatabase :-
@Database(entities = {OldTable.class},version = MainActivity.DATABASE_VERSION,exportSchema = false)
abstract class TheDatabase extends RoomDatabase {
abstract AllDao getAllDao();
private static volatile TheDatabase INSTANCE = null;
static TheDatabase getINSTANCE(Context context) {
if (INSTANCE == null) {
INSTANCE = Room.databaseBuilder(context,TheDatabase.class,MainActivity.DATABASE_NAME)
.allowMainThreadQueries()
.addMigrations(MIGRATION_1_2)
.build();
}
return INSTANCE;
}
static Migration MIGRATION_1_2 = new Migration(1,2) {
@Override
public void migrate(@NonNull SupportSQLiteDatabase database) {
StringBuilder sb = new StringBuilder();
StringBuilder sb2 = new StringBuilder();
ArrayList<String> columns = new ArrayList<>();
for (int i=0; i < MainActivity.column_count;i++) {
columns.add("col" + (i+1));
if (i>0) {
sb.append(",");
sb2.append(",");
}
sb.append(columns.get(i));
sb2.append(columns.get(i)).append(" TEXT");
}
String columnsAsCSV = sb.toString();
String columnDefs = sb2.toString();
database.execSQL("DROP TABLE IF EXISTS newtable");
database.execSQL("CREATE TABLE IF NOT EXISTS newtable (id INTEGER PRIMARY KEY," + columnDefs + ");");
String insertSQL = "INSERT INTO newtable (id,"+columnsAsCSV+") SELECT id,"+columnsAsCSV+" FROM oldtable;";
Log.d("INSERTSQL",insertSQL);
database.execSQL(insertSQL);
}
};
}
最后把它们放在一起 MainActivity :-
public class MainActivity extends AppCompatActivity {
public static final String DATABASE_NAME = "the_database.db";
public static final int DATABASE_VERSION = 2;
public static final int column_count = 150;
private ArrayList<String> column_names = new ArrayList<>();
private String allColumnsAsCSV = "";
TheDatabase db;
AllDao dao;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BuildColumns();
db = TheDatabase.getINSTANCE(this);
dao = db.getAllDao();
SupportSQLiteDatabase supdb = db.getOpenHelper().getWritableDatabase();
StringBuilder sb = new StringBuilder();
for (int i=0;i < 100; i++) {
sb = new StringBuilder();
sb.append("INSERT INTO oldtable (").append(allColumnsAsCSV).append(") VALUES(");
for(int ii=0;ii<column_count;ii++) {
if (ii > 0) {
sb.append(",");
}
sb.append("'").append(column_names.get(ii)).append(i).append(ii).append("'");
}
sb.append(")");
supdb.execSQL(sb.toString());
}
}
void BuildColumns() {
column_names.clear();
allColumnsAsCSV = "";
StringBuilder sb = new StringBuilder();
for (int i=0; i < column_count; i++) {
column_names.add("col" + (i+1));
if (i>0) {
sb.append(",");
}
sb.append(column_names.get(i));
}
allColumnsAsCSV = sb.toString();
}
}