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Diffstat (limited to 'src/third_party/wiredtiger/examples/java/com/wiredtiger/examples/ex_cursor.java')
-rw-r--r-- | src/third_party/wiredtiger/examples/java/com/wiredtiger/examples/ex_cursor.java | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/examples/java/com/wiredtiger/examples/ex_cursor.java b/src/third_party/wiredtiger/examples/java/com/wiredtiger/examples/ex_cursor.java new file mode 100644 index 00000000000..38af04d5849 --- /dev/null +++ b/src/third_party/wiredtiger/examples/java/com/wiredtiger/examples/ex_cursor.java @@ -0,0 +1,242 @@ +/*- + * Public Domain 2014-2015 MongoDB, Inc. + * Public Domain 2008-2014 WiredTiger, Inc. + * + * This is free and unencumbered software released into the public domain. + * + * Anyone is free to copy, modify, publish, use, compile, sell, or + * distribute this software, either in source code form or as a compiled + * binary, for any purpose, commercial or non-commercial, and by any + * means. + * + * In jurisdictions that recognize copyright laws, the author or authors + * of this software dedicate any and all copyright interest in the + * software to the public domain. We make this dedication for the benefit + * of the public at large and to the detriment of our heirs and + * successors. We intend this dedication to be an overt act of + * relinquishment in perpetuity of all present and future rights to this + * software under copyright law. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ex_cursor.java + * This is an example demonstrating some cursor types and operations. + */ + +package com.wiredtiger.examples; +import com.wiredtiger.db.*; +import java.io.*; +import java.util.*; + +public class ex_cursor { + + public static String home; + + /*! [cursor next] */ + public static int + cursor_forward_scan(Cursor cursor) + throws WiredTigerException + { + String key, value; + int ret; + + while ((ret = cursor.next()) == 0) { + key = cursor.getKeyString(); + value = cursor.getValueString(); + } + return (ret); + } + /*! [cursor next] */ + + /*! [cursor prev] */ + public static int + cursor_reverse_scan(Cursor cursor) + throws WiredTigerException + { + String key, value; + int ret; + + while ((ret = cursor.prev()) == 0) { + key = cursor.getKeyString(); + value = cursor.getValueString(); + } + return (ret); + } + /*! [cursor prev] */ + + /*! [cursor reset] */ + public static int + cursor_reset(Cursor cursor) + throws WiredTigerException + { + return (cursor.reset()); + } + /*! [cursor reset] */ + + /*! [cursor search] */ + public static int + cursor_search(Cursor cursor) + throws WiredTigerException + { + String value; + int ret; + + cursor.putKeyString("foo"); + + if ((ret = cursor.search()) != 0) + value = cursor.getValueString(); + + return (ret); + } + /*! [cursor search] */ + + /*! [cursor search near] */ + public static int + cursor_search_near(Cursor cursor) + throws WiredTigerException + { + String key, value; + SearchStatus exact; + + key = "foo"; + cursor.putKeyString(key); + + exact = cursor.search_near(); + if (exact == SearchStatus.SMALLER) + /* Returned key smaller than search key */ + key = cursor.getKeyString(); + else if (exact == SearchStatus.LARGER) + /* Returned key larger than search key */ + key = cursor.getKeyString(); + /* Else exact match found, and key already set */ + + value = cursor.getValueString(); + + return (0); + } + /*! [cursor search near] */ + + /*! [cursor insert] */ + public static int + cursor_insert(Cursor cursor) + throws WiredTigerException + { + cursor.putKeyString("foo"); + cursor.putValueString("bar"); + + return (cursor.insert()); + } + /*! [cursor insert] */ + + /*! [cursor update] */ + public static int + cursor_update(Cursor cursor) + throws WiredTigerException + { + cursor.putKeyString("foo"); + cursor.putValueString("newbar"); + + return (cursor.update()); + } + /*! [cursor update] */ + + /*! [cursor remove] */ + public static int + cursor_remove(Cursor cursor) + throws WiredTigerException + { + cursor.putKeyString("foo"); + return (cursor.remove()); + } + /*! [cursor remove] */ + + public static int + cursorExample() + throws WiredTigerException + { + Connection conn; + Cursor cursor; + Session session; + int ret; + + /* + * Create a clean test directory for this run of the test program if the + * environment variable isn't already set (as is done by make check). + */ + if (System.getenv("WIREDTIGER_HOME") == null) { + home = "WT_HOME"; + try { + Process proc = Runtime.getRuntime().exec("/bin/rm -rf WT_HOME"); + BufferedReader br = new BufferedReader( + new InputStreamReader(proc.getInputStream())); + while(br.ready()) + System.out.println(br.readLine()); + br.close(); + proc.waitFor(); + new File("WT_HOME").mkdir(); + } catch (Exception ex) { + System.err.println("Exception: " + ex); + return (1); + } + } else + home = null; + + conn = wiredtiger.open(home, "create,statistics=(fast)"); + session = conn.open_session(null); + + ret = session.create("table:world", + "key_format=r,value_format=5sii," + + "columns=(id,country,population,area)"); + + /*! [open cursor #1] */ + cursor = session.open_cursor("table:world", null, null); + /*! [open cursor #1] */ + + /*! [open cursor #2] */ + cursor = session.open_cursor("table:world(country,population)", null, null); + /*! [open cursor #2] */ + + /*! [open cursor #3] */ + cursor = session.open_cursor("statistics:", null, null); + /*! [open cursor #3] */ + + /* Create a simple string table to illustrate basic operations. */ + ret = session.create("table:map", "key_format=S,value_format=S"); + cursor = session.open_cursor("table:map", null, null); + ret = cursor_insert(cursor); + ret = cursor_reset(cursor); + ret = cursor_forward_scan(cursor); + ret = cursor_reset(cursor); + ret = cursor_reverse_scan(cursor); + ret = cursor_search_near(cursor); + ret = cursor_update(cursor); + ret = cursor_remove(cursor); + ret = cursor.close(); + + /* Note: closing the connection implicitly closes open session(s). */ + if ((ret = conn.close(null)) != 0) + System.err.println("Error connecting to " + home + ": " + + wiredtiger.wiredtiger_strerror(ret)); + + return (ret); + } + + public static void + main(String[] argv) + { + try { + System.exit(cursorExample()); + } + catch (WiredTigerException wte) { + System.err.println("Exception: " + wte); + wte.printStackTrace(); + System.exit(1); + } + } +} |