fastDB Csharp实例

package jnicli; import java.lang.reflect.*; import java.util.*; /** * Interface to database using Java native interface. * This class should be used by applications accessing database locally */ public class DatabaseJNI implements Database { public void open(int accessType, String databaseName, String databasePath, long initSize, int transactionCommitDelay) { db = jniOpen(accessType, databaseName, databasePath, initSize, transactionCommitDelay); String table; classes = new Hashtable(); while ((table = jniNextTable(db)) != null) { try { Class c = Class.forName(table); ClassDescriptor desc = new ClassDescriptor(c); classes.put(c, desc); desc.td = jniUpdateTable(db, table, getTableDescriptor(desc)); } catch (ClassNotFoundException x) { new CliException("Class '" + table + "' not found"); } catch (Exception x) { new CliException(x.getMessage()); } } } public void close() { jniClose(db); classes = null; } public Cursor select(Class table, String condition, int flags) { ClassDescriptor desc = (ClassDescriptor)classes.get(table); if (desc == null) { throw new CliException("Table not found: " + table); } long result = jniSelect(db, desc.td, condition); Cursor cursor; if (remote || (flags & AUTOCOMMIT) != 0) { cursor = new PrefetchedCursor(this, result, desc); if ((flags & AUTOCOMMIT) != 0) { jniCommit(db); } } else { cursor = (flags & FOR_UPDATE) != 0 ? (Cursor)new IncrementalCursorForUpdate(this, result, desc) : (Cursor)new IncrementalCursor(this, result, desc); } return cursor; } Object unswizzleObject(long cursor, ClassDescriptor desc) { int[] types = desc.types; Field[] fields = desc.fields; try { Object obj = desc.newInstance(); for (int i = 0; i < types.length; i++) { Field f = fields[i]; switch (types[i]) { case TP_BOOL: f.setBoolean(obj, jniGetByte(cursor) != 0); continue; case TP_CHAR: f.setChar(obj, (char)jniGetShort(cursor)); continue; case TP_INT1: f.setByte(obj, jniGetByte(cursor)); continue; case TP_INT2: f.setShort(obj, jniGetShort(cursor)); continue; case TP_INT4: f.setInt(obj, jniGetInt(cursor)); continue; case TP_INT8: f.setLong(obj, jniGetLong(cursor)); continue; case TP_REAL4: f.setFloat(obj, Float.intBitsToFloat(jniGetInt(cursor))); continue; case TP_REAL8: f.setDouble(obj, Double.longBitsToDouble(jniGetLong(cursor))); continue; case TP_STRING: f.set(obj, jniGetString(cursor)); continue; case TP_DATE: { long timestamp = jniGetLong(cursor); f.set(obj, timestamp < 0 ? null : new Date(timestamp)); continue; } case TP_BOOL_ARRAY: f.set(obj, jniGetBoolArray(cursor)); continue; case TP_CHAR_ARRAY: f.set(obj, jniGetCharArray(cursor)); continue; case TP_INT1_ARRAY: f.set(obj, jniGetByteArray(cursor)); continue; case TP_INT2_ARRAY: f.set(obj, jniGetShortArray(cursor)); continue; case TP_INT4_ARRAY: f.set(obj, jniGetIntArray(cursor)); continue; case TP_INT8_ARRAY: f.set(obj, jniGetLongArray(cursor)); continue; case TP_REAL4_ARRAY: f.set(obj, jniGetFloatArray(cursor)); continue; case TP_REAL8_ARRAY: f.set(obj, jniGetDoubleArray(cursor)); continue; case TP_STRING_ARRAY: f.set(obj, jniGetStringArray(cursor)); continue; default: throw new CliException("Invalid field type: " + types[i]); } } return obj; } catch (Exception x) { throw new CliException(x.getMessage()); } } private long swizzleObject(ClassDescriptor desc, Object obj) { long buf = jniCreateBuffer(); int[] types = desc.types; Field[] fields = desc.fields; try { for (int i = 0; i < types.length; i++) { Field f = fields[i]; switch (types[i]) { case TP_BOOL: jniSetByte(buf, (byte)(f.getBoolean(obj) ? 1 : 0)); continue; case TP_CHAR: jniSetShort(buf, (short)f.getChar(obj)); continue; case TP_INT1: jniSetByte(buf, f.getByte(obj)); continue; case TP_INT2: jniSetShort(buf, f.getShort(obj)); continue; case TP_INT4: jniSetInt(buf, f.getInt(obj)); continue; case TP_INT8: jniSetLong(buf, f.getLong(obj)); continue; case TP_REAL4: jniSetInt(buf, Float.floatToIntBits(f.getFloat(obj))); continue; case TP_REAL8: jniSetLong(buf, Double.doubleToLongBits(f.getDouble(obj))); continue; case TP_STRING: jniSetString(buf, (String)f.get(obj)); continue; case TP_DATE: { Date d = (Date)f.get(obj); jniSetLong(buf, d != null ? d.getTime() : -1); continue; } case TP_BOOL_ARRAY: jniSetBoolArray(buf, (boolean[])f.get(obj)); continue; case TP_CHAR_ARRAY: jniSetCharArray(buf, (char[])f.get(obj)); continue; case TP_INT1_ARRAY: jniSetByteArray(buf, (byte[])f.get(obj)); continue; case TP_INT2_ARRAY: jniSetShortArray(buf, (short[])f.get(obj)); continue; case TP_INT4_ARRAY: jniSetIntArray(buf, (int[])f.get(obj)); continue; case TP_INT8_ARRAY: jniSetLongArray(buf, (long[])f.get(obj)); continue; case TP_REAL4_ARRAY: jniSetFloatArray(buf, (float[])f.get(obj)); continue; case TP_REAL8_ARRAY: jniSetDoubleArray(buf, (double[])f.get(obj)); continue; case TP_STRING_ARRAY: jniSetStringArray(buf, (String[])f.get(obj)); continue; default: throw new CliException("Invalid field type: " + types[i]); } } } catch (Exception x)