Android SQLite調試

調試SQLite的神器，再也不用自己去打Log了，只需簡單的幾個命令。   adb shell setprop log.tag.SQLiteLog V adb shell setprop log.tag.SQLiteStatements V adb shell stop adb shell start 結果如下所示   V/SQLiteStatements( 4405): /data/data/[package]/databases/[db_name].db: "UPDATE [table_name] SET state=-1 WHERE note_id='7556'" 想關閉Log也很簡單，把上面代碼中的V改為""就行了   說明在源碼SQLiteDebug.java中    /**      * Controls the printing of informational SQL log messages.      *      * Enable using "adb shell setprop log.tag.SQLiteLog VERBOSE".      */     public static final boolean DEBUG_SQL_LOG =             Log.isLoggable("SQLiteLog", Log.VERBOSE);       /**      * Controls the printing of SQL statements as they are executed.      *      * Enable using "adb shell setprop log.tag.SQLiteStatements VERBOSE".      */     public static final boolean DEBUG_SQL_STATEMENTS =             Log.isLoggable("SQLiteStatements", Log.VERBOSE);       /**      * Controls the printing of wall-clock time taken to execute SQL statements      * as they are executed.      *      * Enable using "adb shell setprop log.tag.SQLiteTime VERBOSE".      */     public static final boolean DEBUG_SQL_TIME =             Log.isLoggable("SQLiteTime", Log.VERBOSE); 源碼中說要用VERBOSE，而我們使用V確也能起作用，看下isLoggable的實現就知道了，isLoggable是native方法，實際執行的是frameworks/base/core/jni/android_util_Log.cpp的android_util_Log_isLoggable方法，android_util_Log_isLoggable調用同一文件內的isLoggable   static jboolean isLoggable(const char* tag, jint level) {     String8 key;     key.append(LOG_NAMESPACE);     key.append(tag);       char buf[PROPERTY_VALUE_MAX];     if (property_get(key.string(), buf, "") <= 0) {         buf[0] = '\0';     }       int logLevel = toLevel(buf);     return logLevel >= 0 && level >= logLevel; } isLoggable中通過propery_get獲取我們之前設定的值，然後對獲取到的結果調用toLevel   static int toLevel(const char* value) {     switch (value[0]) {         case 'V': return levels.verbose;         case 'D': return levels.debug;         case 'I': return levels.info;         case 'W': return levels.warn;         case 'E': return levels.error;         case 'A': return levels.assert;         case 'S': return -1; // SUPPRESS     }     return levels.info; } toLevel只判斷了值的第一個字符，所以我們之前只設置V也可以，其實只要是V開頭的，後接任何字符都無所謂。