最近项目当中使用到MyBatis 动态语句生成的功能，我使用的是sqlBuilder，话不多说，直接上代码，StockMarketProvider.java：
public String selectByStockIdSql(){ BEGIN(); SELECT("*"); FROM(TABLE_NAME); WHERE("stock_id = #{0}"); return SQL(); } public String updateByStockIdSql(){ BEGIN(); UPDATE(TABLE_NAME); SET("jkp=#{jkp}"); SET("zsp=#{zsp}"); SET("zgj=#{zgj}"); SET("zdj=#{zdj}"); SET("ztj=#{ztj}"); SET("dtj=#{dtj}"); SET("hsl=#{hsl}"); SET("zf=#{zf}"); SET("syl=#{syl}"); SET("sjl=#{sjl}"); SET("cjl=#{cjl}"); SET("cje=#{cje}"); SET("zsz=#{zsz}"); SET("ltsz=#{ltsz}"); SET("mr1=#{mr1}"); SET("mr2=#{mr2}"); SET("mr3=#{mr3}"); SET("mr4=#{mr4}"); SET("mr5=#{mr5}"); SET("mc1=#{mc1}"); SET("mc2=#{mc2}"); SET("mc3=#{mc3}"); SET("mc4=#{mc4}"); SET("mc5=#{mc5}"); SET("mr1_num=#{mr1Num}"); SET("mr2_num=#{mr2Num}"); SET("mr3_num=#{mr3Num}"); SET("mr4_num=#{mr4Num}"); SET("mr5_num=#{mr5Num}"); SET("mc1_num=#{mc1Num}"); SET("mc2_num=#{mc2Num}"); SET("mc3_num=#{mc3Num}"); SET("mc4_num=#{mc4Num}"); SET("mc5_num=#{mc5Num}"); SET("status=#{status}"); SET("dqj=#{dqj}"); SET("bhz=#{bhz}"); SET("bhl=#{bhl}"); WHERE("stock_id=#{stockId}"); return SQL(); } //SELECT * FROM market AS a WHERE a.stock_id IN (SELECT id FROM stock AS b WHERE b.`type`=1) //AND a.`status`=0 ORDER BY bhl DESC LIMIT 10; public String selectByOrderAtLimitSql(Map<String,Object> params){ String orderby = (String)params.get("orderby");//使用Params注解，当中的名称作为key BEGIN(); SELECT("*"); FROM(TABLE_NAME+" AS a"); WHERE("a.stock_id IN (SELECT id FROM stock AS b WHERE b.type=1) and a.status=0"); String order="DESC"; if("bhl".equals(orderby)){ order="DESC"; ORDER_BY("bhl"); }else if("hsl".equals(orderby)){ order="ASC"; ORDER_BY("hsl"); }else if("zf".equals(orderby)){ order="DESC"; ORDER_BY("zf"); } return SQL()+" "+order+" limit #{limit}"; } public String selectDiefuListSql(){ BEGIN(); SELECT("*"); FROM(TABLE_NAME+" AS a"); WHERE("a.stock_id IN (SELECT id FROM stock AS b WHERE b.type=1) AND a.status=0 AND a.bhl<0 "); ORDER_BY("a.bhl"); return SQL()+" limit #{0}";//我还没有查到怎样使用limit所以干脆直接加到后面了 }
对应的StockMarketMapper.java 文件：
package com.oliver.mapper.inter; import java.util.List; import org.apache.ibatis.annotations.InsertProvider; import org.apache.ibatis.annotations.Param; import org.apache.ibatis.annotations.Results; import org.apache.ibatis.annotations.Result; import org.apache.ibatis.annotations.SelectKey; import org.apache.ibatis.annotations.SelectProvider; import org.apache.ibatis.annotations.UpdateProvider; import com.oliver.db.sql.StockMarketProvider; import com.oliver.models.StockMarket; public interface IStockMarketMapper { @InsertProvider(type=StockMarketProvider.class,method="insertStockMarketSql") @SelectKey(keyProperty="id",keyColumn="id", before = false, resultType = int.class, statement = { "SELECT LAST_INSERT_ID() AS ID" }) public void insertStockMarket(StockMarket stockMarket); @SelectProvider(type=StockMarketProvider.class,method="selectByStockIdSql") @Results(value={ @Result(id=true,property="id",column="id"), @Result(property="dqj",column="dqj"), @Result(property="bhz",column="bhz"), @Result(property="bhl",column="bhl"), @Result(property="jkp",column="jkp"), @Result(property="zsp",column="zsp"), @Result(property="zgj",column="zgj"), @Result(property="zdj",column="zdj"), @Result(property="ztj",column="ztj"), @Result(property="dtj",column="dtj"), @Result(property="hsl",column="hsl"), @Result(property="zf",column="zf"), @Result(property="syl",column="syl"), @Result(property="sjl",column="sjl"), @Result(property="cjl",column="cjl"), @Result(property="cje",column="cje"), @Result(property="zsz",column="zsz"), @Result(property="ltsz",column="ltsz"), @Result(property="mr1",column="mr1"), @Result(property="mr2",column="mr2"), @Result(property="mr3",column="mr3"), @Result(property="mr4",column="mr4"), @Result(property="mr5",column="mr5"), @Result(property="mc1",column="mc1"), @Result(property="mc2",column="mc2"), @Result(property="mc3",column="mc3"), @Result(property="mc4",column="mc4"), @Result(property="mc5",column="mc5"), @Result(property="mr1Num",column="mr1_num"), @Result(property="mr2Num",column="mr2_num"), @Result(property="mr3Num",column="mr3_num"), @Result(property="mr4Num",column="mr4_num"), @Result(property="mr5Num",column="mr5_num"), @Result(property="mc1Num",column="mc1_num"), @Result(property="mc2Num",column="mc2_num"), @Result(property="mc3Num",column="mc3_num"), @Result(property="mc4Num",column="mc4_num"), @Result(property="mc5Num",column="mc5_num"), @Result(property="status",column="status"), @Result(property="stockId",column="stock_id") }) public StockMarket selectByStockId(int stockId); @UpdateProvider(type=StockMarketProvider.class,method="updateByStockIdSql") public void update(StockMarket stockMarket); @SelectProvider(type=StockMarketProvider.class,method="selectByOrderAtLimitSql") @Results(value={ @Result(id=true,property="id",column="id"), @Result(property="dqj",column="dqj"), @Result(property="bhz",column="bhz"), @Result(property="bhl",column="bhl"), @Result(property="jkp",column="jkp"), @Result(property="zsp",column="zsp"), @Result(property="zgj",column="zgj"), @Result(property="zdj",column="zdj"), @Result(property="ztj",column="ztj"), @Result(property="dtj",column="dtj"), @Result(property="hsl",column="hsl"), @Result(property="zf",column="zf"), @Result(property="syl",column="syl"), @Result(property="sjl",column="sjl"), @Result(property="cjl",column="cjl"), @Result(property="cje",column="cje"), @Result(property="zsz",column="zsz"), @Result(property="ltsz",column="ltsz"), @Result(property="mr1",column="mr1"), @Result(property="mr2",column="mr2"), @Result(property="mr3",column="mr3"), @Result(property="mr4",column="mr4"), @Result(property="mr5",column="mr5"), @Result(property="mc1",column="mc1"), @Result(property="mc2",column="mc2"), @Result(property="mc3",column="mc3"), @Result(property="mc4",column="mc4"), @Result(property="mc5",column="mc5"), @Result(property="mr1Num",column="mr1_num"), @Result(property="mr2Num",column="mr2_num"), @Result(property="mr3Num",column="mr3_num"), @Result(property="mr4Num",column="mr4_num"), @Result(property="mr5Num",column="mr5_num"), @Result(property="mc1Num",column="mc1_num"), @Result(property="mc2Num",column="mc2_num"), @Result(property="mc3Num",column="mc3_num"), @Result(property="mc4Num",column="mc4_num"), @Result(property="mc5Num",column="mc5_num"), @Result(property="status",column="status"), @Result(property="stockId",column="stock_id") }) public List<StockMarket> selectByOrderAtLimit(@Param("orderby")String orderBy, @Param("limit")int limit); @SelectProvider(type=StockMarketProvider.class,method="selectDiefuListSql") @Results(value={ @Result(id=true,property="id",column="id"), @Result(property="dqj",column="dqj"), @Result(property="bhz",column="bhz"), @Result(property="bhl",column="bhl"), @Result(property="jkp",column="jkp"), @Result(property="zsp",column="zsp"), @Result(property="zgj",column="zgj"), @Result(property="zdj",column="zdj"), @Result(property="ztj",column="ztj"), @Result(property="dtj",column="dtj"), @Result(property="hsl",column="hsl"), @Result(property="zf",column="zf"), @Result(property="syl",column="syl"), @Result(property="sjl",column="sjl"), @Result(property="cjl",column="cjl"), @Result(property="cje",column="cje"), @Result(property="zsz",column="zsz"), @Result(property="ltsz",column="ltsz"), @Result(property="mr1",column="mr1"), @Result(property="mr2",column="mr2"), @Result(property="mr3",column="mr3"), @Result(property="mr4",column="mr4"), @Result(property="mr5",column="mr5"), @Result(property="mc1",column="mc1"), @Result(property="mc2",column="mc2"), @Result(property="mc3",column="mc3"), @Result(property="mc4",column="mc4"), @Result(property="mc5",column="mc5"), @Result(property="mr1Num",column="mr1_num"), @Result(property="mr2Num",column="mr2_num"), @Result(property="mr3Num",column="mr3_num"), @Result(property="mr4Num",column="mr4_num"), @Result(property="mr5Num",column="mr5_num"), @Result(property="mc1Num",column="mc1_num"), @Result(property="mc2Num",column="mc2_num"), @Result(property="mc3Num",column="mc3_num"), @Result(property="mc4Num",column="mc4_num"), @Result(property="mc5Num",column="mc5_num"), @Result(property="status",column="status"), @Result(property="stockId",column="stock_id") }) public List<StockMarket> selectDiefuList(int limit); }