src/org/nutz/dao/impl/jdbc/db2/Db2JdbcExpert.java
public boolean createEntity(Dao dao, Entity<?> en) {
        StringBuilder sb = new StringBuilder("CREATE TABLE " + en.getTableName() + "(");
        // 创建字段
        for (MappingField mf : en.getMappingFields()) {
            if (mf.isReadonly())
                continue;
            sb.append('\n').append(mf.getColumnNameInSql());
            sb.append(' ').append(evalFieldType(mf));
            // 非主键的 @Name，应该加入唯一性约束
            if (mf.isName() && en.getPkType() != PkType.NAME) {
                sb.append(" UNIQUE NOT NULL");
            }
            // 普通字段
            else {
                if (mf.isNotNull() || mf.isPk())
                    sb.append(" NOT NULL");
                if (mf.hasDefaultValue()) {
                    addDefaultValue(sb, mf);
                }
                if (mf.isAutoIncreasement())
                    sb.append(" generated by default as identity ");
                if (mf.isPk() && en.getPks().size() == 1) {
                    sb.append(" primary key ");
                }
            }
            sb.append(',');
        }
        // 结束表字段设置
        sb.setCharAt(sb.length() - 1, ')');

        //指定表空间
        if(en.hasMeta(META_TABLESPACE)){
            sb.append(String.format(" IN %s", en.getMeta(META_TABLESPACE)) );
        }

        // 执行创建语句
        dao.execute(Sqls.create(sb.toString()));

        // 创建联合主键
        if (en.getPks().size() > 1) {
            sb = new StringBuilder();
            sb.append("ALTER TABLE ").append(en.getTableName()).append(" ADD CONSTRAINT PK_");
            sb.append(makePksName(en));
            sb.append(" PRIMARY KEY (");
            for (MappingField mf : en.getPks()) {
                sb.append(mf.getColumnNameInSql()).append(",");
            }
            sb.setCharAt(sb.length() - 1, ')');
            dao.execute(Sqls.create(sb.toString()));
        }

        // 创建关联表
        createRelation(dao, en);
        // 创建索引
        dao.execute(createIndexs(en).toArray(new Sql[0]));
        // 添加注释(表注释与字段注释)
        addComment(dao, en);

        return true;
    }
public boolean createEntity(Dao dao, Entity<?> en) {
        StringBuilder sb = new StringBuilder("CREATE TABLE " + en.getTableName() + "(");
        // 创建字段
        for (MappingField mf : en.getMappingFields()) {
            if (mf.isReadonly())
                continue;
            sb.append('\n').append(mf.getColumnNameInSql());
            sb.append(' ').append(evalFieldType(mf));
            // 非主键的 @Name，应该加入唯一性约束
            if (mf.isName() && en.getPkType() != PkType.NAME) {
                sb.append(" UNIQUE NOT NULL");
            }
            // 普通字段
            else {
                if (mf.isNotNull() || mf.isPk())
                    sb.append(" NOT NULL");
                if (mf.hasDefaultValue()) {
                    addDefaultValue(sb, mf);
                }
                if (mf.isAutoIncreasement())
                    sb.append(" generated by default as identity ");
                if (mf.isPk() && en.getPks().size() == 1) {
                    sb.append(" primary key ");
                }
            }
            sb.append(',');
        }
        // 结束表字段设置
        sb.setCharAt(sb.length() - 1, ')');

        //指定表空间
        if(en.hasMeta(META_TABLESPACE)){
            sb.append(String.format(" IN %s", en.getMeta(META_TABLESPACE)) );
        }

        // 执行创建语句
        dao.execute(Sqls.create(sb.toString()));

        // 创建联合主键
        if (en.getPks().size() > 1) {
            sb = new StringBuilder();
            sb.append("ALTER TABLE ").append(en.getTableName()).append(" ADD CONSTRAINT PK_");
            sb.append(makePksName(en));
            sb.append(" PRIMARY KEY (");
            for (MappingField mf : en.getPks()) {
                sb.append(mf.getColumnNameInSql()).append(",");
            }
            sb.setCharAt(sb.length() - 1, ')');
            dao.execute(Sqls.create(sb.toString()));
        }

        // 创建关联表
        createRelation(dao, en);
        // 创建索引
        dao.execute(createIndexs(en).toArray(new Sql[0]));
        // 添加注释(表注释与字段注释)
        addComment(dao, en);

        return true;
    }
TODO not tested!!