Documentation.

h2/src/docsrc/help/help.csv

@@ -1611,8 +1611,11 @@ LIKE 'Jo%'
     | referentialConstraint }
     | PRIMARY KEY [ HASH ] ( columnName [,...] )
 ","
-Defines a constraint. The check condition must evaluate to true or to NULL (to
-prevent NULL, use NOT NULL).
+Defines a constraint.
+The check condition must evaluate to TRUE, FALSE or NULL.
+TRUE and NULL mean the operation is to be permitted, 
+and FALSE means the operation is to be rejected.
+To prevent NULL in a column, use NOT NULL instead of a check constraint.
 ","
 PRIMARY KEY(ID, NAME)
 "

h2/src/docsrc/html/changelog.html

@@ -18,7 +18,10 @@ Change Log
 <h1>Change Log</h1>
 
 <h2>Next Version (unreleased)</h2>
-<ul><li>-
+<ul><li>When adding a comment to a column that has a check constraint, 
+    the database couldn't be re-opened.
+</li><li>New system property h2.lobClientMaxSizeMemory to set the maximum size 
+    of a LOB object to keep in memory on the client side when using the server mode.
 </li></ul>
 
 <h2>Version 1.2.142 (2010-08-31)</h2>

h2/src/main/org/h2/expression/Expression.java

@@ -224,9 +224,9 @@ public abstract class Expression {
     }
 
     /**
-     * Check whether this expression is a column and can store null values.
+     * Check whether this expression is a column and can store NULL.
      *
-     * @return whether null values are allowed
+     * @return whether NULL is allowed
      */
     public int getNullable() {
         return Column.NULLABLE_UNKNOWN;

h2/src/main/org/h2/index/TreeIndex.java

@@ -376,7 +376,7 @@ public class TreeIndex extends BaseIndex {
 
     public Cursor findFirstOrLast(Session session, boolean first) {
         if (first) {
-            // TODO optimization: this loops through NULL values
+            // TODO optimization: this loops through NULL
             Cursor cursor = find(session, null, null);
             while (cursor.next()) {
                 SearchRow row = cursor.getSearchRow();

h2/src/main/org/h2/jdbc/JdbcDatabaseMetaData.java

@@ -459,7 +459,7 @@ public class JdbcDatabaseMetaData extends TraceObject implements DatabaseMetaDat
     }
 
     /**
-     * Checks is NULL values are sorted high (bigger than any non-null values).
+     * Checks if NULL is sorted high (bigger than anything that is not null).
      *
      * @return false by default; true if the system property h2.sortNullsHigh is
      *         set to true
@@ -470,7 +470,7 @@ public class JdbcDatabaseMetaData extends TraceObject implements DatabaseMetaDat
     }
 
     /**
-     * Checks is NULL values are sorted low (smaller than any non-null values).
+     * Checks if NULL is sorted low (smaller than anything that is not null).
      *
      * @return true by default; false if the system property h2.sortNullsHigh is
      *         set to true
@@ -481,8 +481,8 @@ public class JdbcDatabaseMetaData extends TraceObject implements DatabaseMetaDat
     }
 
     /**
-     * Checks is NULL values are sorted at the beginning (no matter if ASC or
-     * DESC is used).
+     * Checks if NULL is sorted at the beginning (no matter if ASC or DESC is
+     * used).
      *
      * @return false
      */
@@ -492,8 +492,7 @@ public class JdbcDatabaseMetaData extends TraceObject implements DatabaseMetaDat
     }
 
     /**
-     * Checks is NULL values are sorted at the end (no matter if ASC or DESC is
-     * used).
+     * Checks if NULL is sorted at the end (no matter if ASC or DESC is used).
      *
      * @return false
      */

h2/src/main/org/h2/jdbc/JdbcResultSet.java

@@ -140,9 +140,9 @@ public class JdbcResultSet extends TraceObject implements ResultSet {
     }
 
     /**
-     * Returns whether the last column accessed was a null value.
+     * Returns whether the last column accessed was null.
      *
-     * @return true if the last column accessed was a null value
+     * @return true if the last column accessed was null
      */
     public boolean wasNull() throws SQLException {
         try {

h2/src/main/org/h2/store/FileLock.java

@@ -22,10 +22,10 @@ import org.h2.message.DbException;
 import org.h2.message.Trace;
 import org.h2.message.TraceSystem;
 import org.h2.store.fs.FileSystem;
-import org.h2.util.StringUtils;
 import org.h2.util.MathUtils;
 import org.h2.util.NetUtils;
 import org.h2.util.SortedProperties;
+import org.h2.util.StringUtils;
 import org.h2.value.Transfer;
 
 /**