Database (moe.ios.core API)

java.lang.Object
- SQLite.Database

```
public class Database
extends Object
```
Main class wrapping an SQLite database.

Field Summary

Fields
Modifier and Type Field and Description

protected int error_code
Internal last error code for exec() methods.

protected long handle
Internal handle for the native SQLite API.

Fields
Modifier and Type	Field and Description
`protected int`	`error_code` Internal last error code for exec() methods.
`protected long`	`handle` Internal handle for the native SQLite API.

Constructor Summary

Constructors
Constructor and Description

Database()

Constructors
Constructor and Description
`Database()`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected static boolean`	`_enable_shared_cache(boolean onoff)` Enable/disable shared cache mode (SQLite 3.x only).
`Backup`	`backup(Database dest, String destName, String srcName)` Initiate a database backup, SQLite 3.x only.
`void`	`busy_handler(BusyHandler bh)` Establish a busy callback method which gets called when an SQLite table is locked.
`void`	`busy_timeout(int ms)` Set the timeout for waiting for an SQLite table to become unlocked.
`long`	`changes()` Return the number of changed rows for the last statement.
`void`	`close()` Close the underlying SQLite database file.
`Vm`	`compile(String sql)` Compile and return SQLite VM for SQL statement.
`Vm`	`compile(String sql, String[] args)` Compile and return SQLite VM for SQL statement.
`static boolean`	`complete(String sql)` See if an SQL statement is complete.
`void`	`create_aggregate(String name, int nargs, Function f)` Create aggregate function.
`void`	`create_function(String name, int nargs, Function f)` Create regular function.
`int`	`db_status(int op, int[] info, boolean flag)` Return information on SQLite connection status.
`String`	`dbversion()` Return SQLite version number as string.
`String`	`error_message()` Return last error message of SQLite3 engine.
`static String`	`error_string(int error_code)` Return error string given SQLite error code (SQLite2).
`void`	`exec(String sql, Callback cb)` Execute an SQL statement and invoke callback methods for each row of the result set.
`void`	`exec(String sql, Callback cb, String[] args)` Execute an SQL statement and invoke callback methods for each row of the result set.
`protected void`	`finalize()` Destructor for object.
`void`	`function_type(String name, int type)` Set function return type.
`TableResult`	`get_table(String sql)` Convenience method to retrieve an entire result set into memory.
`TableResult`	`get_table(String sql, int maxrows)` Convenience method to retrieve an entire result set into memory.
`TableResult`	`get_table(String sql, int maxrows, String[] args)` Convenience method to retrieve an entire result set into memory.
`TableResult`	`get_table(String sql, String[] args)` Convenience method to retrieve an entire result set into memory.
`void`	`get_table(String sql, String[] args, TableResult tbl)` Convenience method to retrieve an entire result set into memory.
`void`	`interrupt()` Abort the current SQLite operation.
`boolean`	`is3()` Check type of open database.
`static double`	`julian_from_long(long ms)` Make julian date value from java.lang.Date
`void`	`key(byte[] ekey)` Specify key for encrypted database.
`void`	`key(String skey)` Specify key for encrypted database.
`int`	`last_error()` Return the code of the last error occured in any of the exec() methods.
`long`	`last_insert_rowid()` Return the row identifier of the last inserted row.
`static long`	`long_from_julian(double d)` Make long value from julian date for java.lang.Date
`static long`	`long_from_julian(String s)` Make long value from julian date for java.lang.Date
`void`	`open_aux_file(String filename)` Open SQLite auxiliary database file for temporary tables.
`Blob`	`open_blob(String db, String table, String column, long row, boolean rw)` Open an SQLite3 blob.
`void`	`open(String filename, int mode)` Open an SQLite database file.
`void`	`open(String filename, int mode, String vfs)` Open an SQLite database file.
`void`	`open(String filename, int mode, String vfs, boolean ver2)` Open an SQLite database file.
`Stmt`	`prepare(String sql)` Prepare and return SQLite3 statement for SQL.
`void`	`profile(Profile pr)` Set profile function.
`void`	`progress_handler(int n, ProgressHandler p)` Establish a progress callback method which gets called after N SQLite VM opcodes.
`void`	`rekey(byte[] ekey)` Change the key of a encrypted database.
`void`	`rekey(String skey)` Change the key of a encrypted database.
`void`	`set_authorizer(Authorizer auth)` Set authorizer function.
`void`	`set_encoding(String enc)` Set character encoding.
`protected void`	`set_last_error(int error_code)` Internal: set error code.
`static int`	`status(int op, int[] info, boolean flag)` Return information on SQLite runtime status.
`void`	`trace(Trace tr)` Set trace function.
`static String`	`version()` Return SQLite version number as string.

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - handle
```
protected long handle
```
    Internal handle for the native SQLite API.
  - error_code
```
protected int error_code
```
    Internal last error code for exec() methods.
- Constructor Detail
  - Database
```
public Database()
```
- Method Detail
  - open
```
public void open(String filename,
                 int mode)
          throws Exception
```
    Open an SQLite database file.
    
    Parameters:
    
    filename - the name of the database file
    
    mode - open mode (e.g. SQLITE_OPEN_READONLY)
    
    Throws:
    
    Exception
  - open
```
public void open(String filename,
                 int mode,
                 String vfs)
          throws Exception
```
    Open an SQLite database file.
    
    Parameters:
    
    filename - the name of the database file
    
    mode - open mode (e.g. SQLITE_OPEN_READONLY)
    
    vfs - VFS name (for SQLite >= 3.5)
    
    Throws:
    
    Exception
  - open
```
public void open(String filename,
                 int mode,
                 String vfs,
                 boolean ver2)
          throws Exception
```
    Open an SQLite database file.
    
    Parameters:
    
    filename - the name of the database file
    
    mode - open mode (e.g. SQLITE_OPEN_READONLY)
    
    vfs - VFS name (for SQLite >= 3.5)
    
    ver2 - flag to force version on create (false = SQLite3, true = SQLite2)
    
    Throws:
    
    Exception
  - open_aux_file
```
public void open_aux_file(String filename)
                   throws Exception
```
    Open SQLite auxiliary database file for temporary tables.
    
    Parameters:
    
    filename - the name of the auxiliary file or null
    
    Throws:
    
    Exception
  - finalize
```
protected void finalize()
```
    Destructor for object.
    
    Overrides:
    
    finalize in class Object
  - close
```
public void close()
           throws Exception
```
    Close the underlying SQLite database file.
    
    Throws:
    
    Exception
  - exec
```
public void exec(String sql,
                 Callback cb)
          throws Exception
```
    Execute an SQL statement and invoke callback methods for each row of the result set.
    It the method fails, an SQLite.Exception is thrown and an error code is set, which later can be retrieved by the last_error() method.
    
    Parameters:
    
    sql - the SQL statement to be executed
    
    cb - the object implementing the callback methods
    
    Throws:
    
    Exception
  - exec
```
public void exec(String sql,
                 Callback cb,
                 String[] args)
          throws Exception
```
    Execute an SQL statement and invoke callback methods for each row of the result set. Each '%q' or %Q in the statement string is substituted by its corresponding element in the argument vector.
    
    Example:
```
   String args[] = new String[1];
   args[0] = "tab%";
   db.exec("select * from sqlite_master where type like '%q'",
           null, args);
 
```
    It the method fails, an SQLite.Exception is thrown and an error code is set, which later can be retrieved by the last_error() method.
    Parameters:
    
    sql - the SQL statement to be executed
    
    cb - the object implementing the callback methods
    
    args - arguments for the SQL statement, '%q' substitution
    
    Throws:
    
    Exception
  - last_insert_rowid
```
public long last_insert_rowid()
```
    Return the row identifier of the last inserted row.
  - interrupt
```
public void interrupt()
```
    Abort the current SQLite operation.
  - changes
```
public long changes()
```
    Return the number of changed rows for the last statement.
  - busy_handler
```
public void busy_handler(BusyHandler bh)
```
    Establish a busy callback method which gets called when an SQLite table is locked.
    
    Parameters:
    
    bh - the object implementing the busy callback method
  - busy_timeout
```
public void busy_timeout(int ms)
```
    Set the timeout for waiting for an SQLite table to become unlocked.
    
    Parameters:
    
    ms - number of millisecond to wait
  - get_table
```
public TableResult get_table(String sql,
                             int maxrows)
                      throws Exception
```
    Convenience method to retrieve an entire result set into memory.
    
    Parameters:
    
    sql - the SQL statement to be executed
    
    maxrows - the max. number of rows to retrieve
    
    Returns:
    
    result set
    
    Throws:
    
    Exception
  - get_table
```
public TableResult get_table(String sql)
                      throws Exception
```
    Convenience method to retrieve an entire result set into memory.
    
    Parameters:
    
    sql - the SQL statement to be executed
    
    Returns:
    
    result set
    
    Throws:
    
    Exception
  - get_table
```
public TableResult get_table(String sql,
                             int maxrows,
                             String[] args)
                      throws Exception
```
    Convenience method to retrieve an entire result set into memory.
    
    Parameters:
    
    sql - the SQL statement to be executed
    
    maxrows - the max. number of rows to retrieve
    
    args - arguments for the SQL statement, '%q' substitution
    
    Returns:
    
    result set
    
    Throws:
    
    Exception
  - get_table
```
public TableResult get_table(String sql,
                             String[] args)
                      throws Exception
```
    Convenience method to retrieve an entire result set into memory.
    
    Parameters:
    
    sql - the SQL statement to be executed
    
    args - arguments for the SQL statement, '%q' substitution
    
    Returns:
    
    result set
    
    Throws:
    
    Exception
  - get_table
```
public void get_table(String sql,
                      String[] args,
                      TableResult tbl)
               throws Exception
```
    Convenience method to retrieve an entire result set into memory.
    
    Parameters:
    
    sql - the SQL statement to be executed
    
    args - arguments for the SQL statement, '%q' substitution
    
    tbl - TableResult to receive result set
    
    Throws:
    
    Exception
  - complete
```
public static boolean complete(String sql)
```
    See if an SQL statement is complete. Returns true if the input string comprises one or more complete SQL statements.
    
    Parameters:
    
    sql - the SQL statement to be checked
  - version
```
public static String version()
```
    Return SQLite version number as string. Don't rely on this when both SQLite 2 and 3 are compiled into the native part. Use the class method in this case.
  - dbversion
```
public String dbversion()
```
    Return SQLite version number as string. If the database is not open, unknown is returned.
  - create_function
```
public void create_function(String name,
                            int nargs,
                            Function f)
```
    Create regular function.
    
    Parameters:
    
    name - the name of the new function
    
    nargs - number of arguments to function
    
    f - interface of function
  - create_aggregate
```
public void create_aggregate(String name,
                             int nargs,
                             Function f)
```
    Create aggregate function.
    
    Parameters:
    
    name - the name of the new function
    
    nargs - number of arguments to function
    
    f - interface of function
  - function_type
```
public void function_type(String name,
                          int type)
```
    Set function return type. Only available in SQLite 2.6.0 and above, otherwise a no-op.
    
    Parameters:
    
    name - the name of the function whose return type is to be set
    
    type - return type code, e.g. SQLite.Constants.SQLITE_NUMERIC
  - last_error
```
public int last_error()
```
    Return the code of the last error occured in any of the exec() methods. The value is valid after an Exception has been reported by one of these methods. See the Constants class for possible values.
    
    Returns:
    
    SQLite error code
  - set_last_error
```
protected void set_last_error(int error_code)
```
    Internal: set error code.
    
    Parameters:
    
    error_code - new error code
  - error_message
```
public String error_message()
```
    Return last error message of SQLite3 engine.
    
    Returns:
    
    error string or null
  - error_string
```
public static String error_string(int error_code)
```
    Return error string given SQLite error code (SQLite2).
    
    Parameters:
    
    error_code - the error code
    
    Returns:
    
    error string
  - set_encoding
```
public void set_encoding(String enc)
                  throws Exception
```
    Set character encoding.
    
    Parameters:
    
    enc - name of encoding
    
    Throws:
    
    Exception
  - set_authorizer
```
public void set_authorizer(Authorizer auth)
```
    Set authorizer function. Only available in SQLite 2.7.6 and above, otherwise a no-op.
    
    Parameters:
    
    auth - the authorizer function
  - trace
```
public void trace(Trace tr)
```
    Set trace function. Only available in SQLite 2.7.6 and above, otherwise a no-op.
    
    Parameters:
    
    tr - the trace function
  - backup
```
public Backup backup(Database dest,
                     String destName,
                     String srcName)
              throws Exception
```
    Initiate a database backup, SQLite 3.x only.
    
    Parameters:
    
    dest - destination database
    
    destName - schema of destination database to be backed up
    
    srcName - schema of source database
    
    Returns:
    
    Backup object to perform the backup operation
    
    Throws:
    
    Exception
  - profile
```
public void profile(Profile pr)
```
    Set profile function. Only available in SQLite 3.6 and above, otherwise a no-op.
    
    Parameters:
    
    pr - the trace function
  - status
```
public static int status(int op,
                         int[] info,
                         boolean flag)
```
    Return information on SQLite runtime status. Only available in SQLite 3.6 and above, otherwise a no-op.
    
    Parameters:
    
    op - operation code
    
    info - output buffer, must be able to hold two values (current/highwater)
    
    flag - reset flag
    
    Returns:
    
    SQLite error code
  - db_status
```
public int db_status(int op,
                     int[] info,
                     boolean flag)
```
    Return information on SQLite connection status. Only available in SQLite 3.6 and above, otherwise a no-op.
    
    Parameters:
    
    op - operation code
    
    info - output buffer, must be able to hold two values (current/highwater)
    
    flag - reset flag
    
    Returns:
    
    SQLite error code
  - compile
```
public Vm compile(String sql)
           throws Exception
```
    Compile and return SQLite VM for SQL statement. Only available in SQLite 2.8.0 and above, otherwise a no-op.
    
    Parameters:
    
    sql - SQL statement to be compiled
    
    Returns:
    
    a Vm object
    
    Throws:
    
    Exception
  - compile
```
public Vm compile(String sql,
                  String[] args)
           throws Exception
```
    Compile and return SQLite VM for SQL statement. Only available in SQLite 3.0 and above, otherwise a no-op.
    
    Parameters:
    
    sql - SQL statement to be compiled
    
    args - arguments for the SQL statement, '%q' substitution
    
    Returns:
    
    a Vm object
    
    Throws:
    
    Exception
  - prepare
```
public Stmt prepare(String sql)
             throws Exception
```
    Prepare and return SQLite3 statement for SQL. Only available in SQLite 3.0 and above, otherwise a no-op.
    
    Parameters:
    
    sql - SQL statement to be prepared
    
    Returns:
    
    a Stmt object
    
    Throws:
    
    Exception
  - open_blob
```
public Blob open_blob(String db,
                      String table,
                      String column,
                      long row,
                      boolean rw)
               throws Exception
```
    Open an SQLite3 blob. Only available in SQLite 3.4.0 and above.
    
    Parameters:
    
    db - database name
    
    table - table name
    
    column - column name
    
    row - row identifier
    
    rw - if true, open for read-write, else read-only
    
    Returns:
    
    a Blob object
    
    Throws:
    
    Exception
  - is3
```
public boolean is3()
```
    Check type of open database.
    
    Returns:
    
    true if SQLite3 database
  - progress_handler
```
public void progress_handler(int n,
                             ProgressHandler p)
```
    Establish a progress callback method which gets called after N SQLite VM opcodes.
    
    Parameters:
    
    n - number of SQLite VM opcodes until callback is invoked
    
    p - the object implementing the progress callback method
  - key
```
public void key(byte[] ekey)
         throws Exception
```
    Specify key for encrypted database. To be called right after open() on SQLite3 databases. Not available in public releases of SQLite.
    
    Parameters:
    
    ekey - the key as byte array
    
    Throws:
    
    Exception
  - key
```
public void key(String skey)
         throws Exception
```
    Specify key for encrypted database. To be called right after open() on SQLite3 databases. Not available in public releases of SQLite.
    
    Parameters:
    
    skey - the key as String
    
    Throws:
    
    Exception
  - rekey
```
public void rekey(byte[] ekey)
           throws Exception
```
    Change the key of a encrypted database. The SQLite3 database must have been open()ed. Not available in public releases of SQLite.
    
    Parameters:
    
    ekey - the key as byte array
    
    Throws:
    
    Exception
  - rekey
```
public void rekey(String skey)
           throws Exception
```
    Change the key of a encrypted database. The SQLite3 database must have been open()ed. Not available in public releases of SQLite.
    
    Parameters:
    
    skey - the key as String
    
    Throws:
    
    Exception
  - _enable_shared_cache
```
protected static boolean _enable_shared_cache(boolean onoff)
```
    Enable/disable shared cache mode (SQLite 3.x only).
    
    Parameters:
    
    onoff - boolean to enable or disable shared cache
    
    Returns:
    
    boolean when true, function supported/succeeded
  - long_from_julian
```
public static long long_from_julian(double d)
```
    Make long value from julian date for java.lang.Date
    
    Parameters:
    
    d - double value (julian date in SQLite3 format)
    
    Returns:
    
    long
  - long_from_julian
```
public static long long_from_julian(String s)
                             throws Exception
```
    Make long value from julian date for java.lang.Date
    
    Parameters:
    
    s - string (double value) (julian date in SQLite3 format)
    
    Returns:
    
    long
    
    Throws:
    
    Exception
  - julian_from_long
```
public static double julian_from_long(long ms)
```
    Make julian date value from java.lang.Date
    
    Parameters:
    
    ms - millisecond value of java.lang.Date
    
    Returns:
    
    double

Class Database

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

handle

error_code

Constructor Detail

Database

Method Detail

open

open

open

open_aux_file

finalize

close

exec

exec

last_insert_rowid

interrupt

changes

busy_handler

busy_timeout

get_table

get_table

get_table

get_table

get_table

complete

version

dbversion

create_function

create_aggregate

function_type

last_error

set_last_error

error_message

error_string

set_encoding

set_authorizer

trace

backup

profile

status

db_status

compile

compile

prepare

open_blob

is3

progress_handler

key

key

rekey

rekey

_enable_shared_cache

long_from_julian

long_from_julian

julian_from_long