package org.nutz.dao.impl.jdbc.sqlserver2005;
import java.util.List;
import org.nutz.dao.DB;
import org.nutz.dao.Dao;
import org.nutz.dao.Sqls;
import org.nutz.dao.entity.Entity;
import org.nutz.dao.entity.MappingField;
import org.nutz.dao.entity.PkType;
import org.nutz.dao.impl.jdbc.AbstractJdbcExpert;
import org.nutz.dao.jdbc.JdbcExpertConfigFile;
import org.nutz.dao.pager.Pager;
import org.nutz.dao.sql.PItem;
import org.nutz.dao.sql.Pojo;
import org.nutz.dao.util.Pojos;
/**
*
* @author wendal
*/
public class Sqlserver2005JdbcExpert extends AbstractJdbcExpert {
public Sqlserver2005JdbcExpert(JdbcExpertConfigFile conf) {
super(conf);
}
public String getDatabaseType() {
return DB.SQLSERVER.name();
}
public boolean createEntity(Dao dao, Entity<?> en) {
StringBuilder sb = new StringBuilder("CREATE TABLE " + en.getTableName() + "(");
// 创建字段
for (MappingField mf : en.getMappingFields()) {
sb.append('\n').append(mf.getColumnName());
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.isUnsigned())
sb.append(" UNSIGNED");
if (mf.isNotNull())
sb.append(" NOT NULL");
if (mf.isAutoIncreasement())
sb.append(" IDENTITY");
if (mf.hasDefaultValue())
sb.append(" DEFAULT '").append(mf.getDefaultValue(null)).append('\'');
}
sb.append(',');
}
// 创建主键
List<MappingField> pks = en.getPks();
if (!pks.isEmpty()) {
sb.append('\n');
sb.append("PRIMARY KEY (");
for (MappingField pk : pks) {
sb.append(pk.getColumnName()).append(',');
}
sb.setCharAt(sb.length() - 1, ')');
sb.append("\n ");
}
// 创建索引
// TODO ...
// 结束表字段设置
sb.setCharAt(sb.length() - 1, ')');
// 执行创建语句
dao.execute(Sqls.create(sb.toString()));
// 创建关联表
createRelation(dao, en);
return true;
}
@Override
protected String evalFieldType(MappingField mf) {
switch (mf.getColumnType()) {
case BOOLEAN:
return "BIT";
case TIMESTAMP:
return "DATETIME";// TODO 值得讨论
case DATETIME:
case DATE:
case TIME:
return "DATETIME";
case INT:
// 用户自定义了宽度
if (mf.getWidth() > 0)
return "NUMERIC(" + mf.getWidth() + ")";
// 用数据库的默认宽度
return "INT";
case FLOAT:
// 用户自定义了精度
if (mf.getWidth() > 0 && mf.getPrecision() > 0) {
return "decimal(" + mf.getWidth() + "," + mf.getPrecision() + ")";
}
// 用默认精度
if (mf.getTypeMirror().isDouble())
return "decimal(15,10)";
return "float";
}
return super.evalFieldType(mf);
}
public void formatQuery(Pojo pojo) {
Pager pager = pojo.getContext().getPager();
if (pager == null)
return;
// -----------------------------------------------------
// TODO XXX 这个写法灰常暴力!!But , it works!!!! 期待更好的写法
PItem pi = pojo.getItem(0);
StringBuilder sb = new StringBuilder();
pi.joinSql(pojo.getEntity(), sb);
String str = sb.toString();
if (str.trim().toLowerCase().startsWith("select")) {
pojo.setItem(0, Pojos.Items.wrap(str.substring(6)));
} else
return;// 以免出错.
pojo.insertFirst(Pojos.Items.wrapf( "select * from(select row_number()over(order by __tc__)__rn__,* from(select top %d 0 __tc__, ",
pager.getOffset() + pager.getPageSize()));
pojo.append(Pojos.Items.wrapf(")t)tt where __rn__ > %d", pager.getOffset()));
}
@Override
protected String createResultSetMetaSql(Entity<?> en) {
return "SELECT top 1 * FROM " + en.getViewName();
}
}