#514 - ENH: Add ebean.ddl.createOnly=true ... such that all the drop table statements are skipped (for running tests against H2 usually)

src/main/java/com/avaje/ebean/config/ServerConfig.java

@@ -212,6 +212,8 @@ public class ServerConfig {
 
   private boolean ddlRun;
 
+  private boolean ddlCreateOnly;
+
   private boolean useJtaTransactionManager;
 
   /**
@@ -1529,19 +1531,45 @@ public class ServerConfig {
   }
 
   /**
-   * Set to true to run the DDL generation on startup.
+   * Set to true to generate the "create all" DDL on startup.
+   *
+   * Typically we want this on when we are running tests locally (and often using H2)
+   * and we want to create the full DB schema from scratch to run tests.
    */
   public void setDdlGenerate(boolean ddlGenerate) {
     this.ddlGenerate = ddlGenerate;
   }
 
   /**
-   * Set to true to run the generated DDL on startup.
+   * Set to true to run the generated "create all DDL" on startup.
+   *
+   * Typically we want this on when we are running tests locally (and often using H2)
+   * and we want to create the full DB schema from scratch to run tests.
    */
   public void setDdlRun(boolean ddlRun) {
     this.ddlRun = ddlRun;
   }
 
+  /**
+   * Return true if the "drop all ddl" should be skipped.
+   *
+   * Typically we want to do this when using H2 (in memory) as our test database and the drop statements
+   * are not required so skipping the drop table statements etc makes it faster with less noise in the logs.
+   */
+  public boolean isDdlCreateOnly() {
+    return ddlCreateOnly;
+  }
+
+  /**
+   * Set to true if the "drop all ddl" should be skipped.
+   *
+   * Typically we want to do this when using H2 (in memory) as our test database and the drop statements
+   * are not required so skipping the drop table statements etc makes it faster with less noise in the logs.
+   */
+  public void setDdlCreateOnly(boolean ddlCreateOnly) {
+    this.ddlCreateOnly = ddlCreateOnly;
+  }
+
   /**
    * Return true if the DDL should be generated.
    */
@@ -2232,6 +2260,7 @@ public class ServerConfig {
 
     ddlGenerate = p.getBoolean("ddl.generate", ddlGenerate);
     ddlRun = p.getBoolean("ddl.run", ddlRun);
+    ddlCreateOnly = p.getBoolean("ddl.createOnly", ddlCreateOnly);
 
     classes = getClasses(p);
   }

src/main/java/com/avaje/ebean/dbmigration/DdlGenerator.java

@@ -33,6 +33,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
 
   private boolean generateDdl;
   private boolean runDdl;
+  private boolean createOnly;
 
   private CurrentModel currentModel;
   private String dropContent;
@@ -42,6 +43,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
     this.server = server;
     this.generateDdl = serverConfig.isDdlGenerate();
     this.runDdl = serverConfig.isDdlRun();
+    this.createOnly = serverConfig.isDdlCreateOnly();
   }
 
   /**
@@ -60,7 +62,9 @@ public class DdlGenerator implements SpiEbeanPlugin {
    */
   public void generateDdl() {
     if (generateDdl) {
-      writeDrop(getDropFileName());
+      if (!createOnly) {
+        writeDrop(getDropFileName());
+      }
       writeCreate(getCreateFileName());
     }
   }
@@ -78,7 +82,9 @@ public class DdlGenerator implements SpiEbeanPlugin {
         if (createContent == null) {
           createContent = readFile(getCreateFileName());
         }
-        runScript(true, dropContent);
+        if (!createOnly) {
+          runScript(true, dropContent);
+        }
         runScript(false, createContent);
 
       } catch (IOException e) {