如何获取android sqlite数据库中的所有表名？

Question

I have tried this code

Cursor c=db.rawQuery("SELECT name FROM sqlite_master WHERE type = 'table'",null);
c.moveToFirst();
while(!c.isAfterLast()){
    Toast.makeText(activityName.this, "Table Name=> "+c.getString(0), 
        Toast.LENGTH_LONG).show();
}

But it throws the error:

"android.database.sqlite.SQLiteException: no such table: sqlite_master(code 1):, while 
compiling: SELECT name FROM sqlite_master WHERE type='table'"

How to fetch all the table names?

Answer 1

Checked, tested and functioning. Try this code:

Cursor c = db.rawQuery("SELECT name FROM sqlite_master WHERE type='table'", null);

if (c.moveToFirst()) {
    while ( !c.isAfterLast() ) {
        Toast.makeText(activityName.this, "Table Name=> "+c.getString(0), Toast.LENGTH_LONG).show();
        c.moveToNext();
    }
}

I am assuming, at some point down the line, you will to grab a list of the table names to display in perhaps a ListView or something. Not just show a Toast.

Untested code. Just what came at the top of my mind. Do test before using it in a production app. ;-)

In that event, consider the following changes to the code posted above:

ArrayList<String> arrTblNames = new ArrayList<String>();
Cursor c = db.rawQuery("SELECT name FROM sqlite_master WHERE type='table'", null);

    if (c.moveToFirst()) {
        while ( !c.isAfterLast() ) {
            arrTblNames.add( c.getString( c.getColumnIndex("name")) );
            c.moveToNext();
        }
    }

Answer 2

将您的 sql 字符串更改为：

"SELECT name FROM sqlite_master WHERE type='table' AND name!='android_metadata' order by name"

Answer 3

To get table name with list of all column of that table

    public void getDatabaseStructure(SQLiteDatabase db) {

            Cursor c = db.rawQuery(
                    "SELECT name FROM sqlite_master WHERE type='table'", null);
            ArrayList<String[]> result = new ArrayList<String[]>();
            int i = 0;
            result.add(c.getColumnNames());
            for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
                String[] temp = new String[c.getColumnCount()];
                for (i = 0; i < temp.length; i++) {
                    temp[i] = c.getString(i);
                    System.out.println("TABLE - "+temp[i]);


                    Cursor c1 = db.rawQuery(
                            "SELECT * FROM "+temp[i], null);
                    c1.moveToFirst();
                    String[] COLUMNS = c1.getColumnNames();
                    for(int j=0;j<COLUMNS.length;j++){
                        c1.move(j);
                        System.out.println("    COLUMN - "+COLUMNS[j]);
                    }
                }
                result.add(temp);
            }
}

Answer 4

Try adding the schema before the table

schema.sqlite_master

From SQL FAQ

If you are running the sqlite3 command-line access program you can type ".tables" to get a list of all tables. Or you can type ".schema" to see the complete database schema including all tables and indices. Either of these commands can be followed by a LIKE pattern that will restrict the tables that are displayed.

From within a C/C++ program (or a script using Tcl/Ruby/Perl/Python bindings) you can get access to table and index names by doing a SELECT on a special table named "SQLITE_MASTER". Every SQLite database has an SQLITE_MASTER table that defines the schema for the database . The SQLITE_MASTER table looks like this:

CREATE TABLE sqlite_master ( type TEXT, name TEXT, tbl_name TEXT, rootpage INTEGER, sql TEXT );

Answer 5

试试这个：

SELECT name FROM sqlite_master WHERE type = "table";

Answer 6

I tested Siddharth Lele answer with Kotlin and Room, and it works as well.

The same code but using Kotlin and Room is something like that:

val cursor = roomDatabaseInstance.query(SimpleSQLiteQuery("SELECT name FROM sqlite_master WHERE type='table' AND name NOT IN ('android_metadata', 'sqlite_sequence', 'room_master_table')"))
val tableNames = arrayListOf<String>()
if(cursor.moveToFirst()) {
   while (!cursor.isAfterLast) {
      tableNames.add(cursor.getString(0))
      cursor.moveToNext()
   }
}