performance - fix passing concatenation to StringBuilder append

h2/src/main/org/h2/command/Parser.java

@@ -1206,8 +1206,7 @@ public class Parser {
         StringBuilder targetMatchQuerySQL = new StringBuilder(
                 "SELECT _ROWID_ FROM " + command.getTargetTable().getName());
         if (command.getTargetTableFilter().getTableAlias() != null) {
-            targetMatchQuerySQL.append(
-                    " AS " + command.getTargetTableFilter().getTableAlias());
+            targetMatchQuerySQL.append(" AS ").append(command.getTargetTableFilter().getTableAlias());
         }
         targetMatchQuerySQL
                 .append(" WHERE ").append(command.getOnCondition().getSQL());

h2/src/main/org/h2/server/web/WebApp.java

@@ -1268,9 +1268,8 @@ public class WebApp {
                     sqlUpper.contains("ALTER") ||
                     sqlUpper.contains("RUNSCRIPT")) {
                 String sessionId = attributes.getProperty("jsessionid");
-                buff.append("<script type=\"text/javascript\">" +
-                        "parent['h2menu'].location='tables.do?jsessionid="
-                        + sessionId + "';</script>");
+                buff.append("<script type=\"text/javascript\">parent['h2menu'].location='tables.do?jsessionid=")
+                        .append(sessionId).append("';</script>");
             }
             Statement stat;
             DbContents contents = session.getContents();

h2/src/main/org/h2/util/AbbaLockingDetector.java

@@ -219,7 +219,7 @@ public class AbbaLockingDetector implements Runnable {
                         dumpStackTraceElement(info, sb, i, e);
                         startDumping = true;
                     }
-                    sb.append("\t-  locked " + mi);
+                    sb.append("\t-  locked ").append(mi);
                     sb.append('\n');
                 }
             }

h2/src/main/org/h2/util/ThreadDeadlockDetector.java

@@ -153,7 +153,7 @@ public class ThreadDeadlockDetector {
         print.print("\"" + ti.getThreadName() + "\"" + " Id="
                 + ti.getThreadId() + " in " + ti.getThreadState());
         if (ti.getLockName() != null) {
-            print.append(" on lock=" + ti.getLockName());
+            print.append(" on lock=").append(ti.getLockName());
         }
         if (ti.isSuspended()) {
             print.append(" (suspended)");