最近使用mybatis-plus的 saveOrUpdateBath 和saveBath接口执行特别慢，数据量大时往往需要十几分钟，打开日志查看原来批量操作也是循环单条数据插入的，那有没有批量更新的办法呢？？
mybatis-plus 提供了一个自定义方法sql注入器DefaultSqlInjector我们可以通过继DefaultSqlInjector来加入自定义的方法达到批量插入的效果。
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import com.baomidou.mybatisplus.core.injector.AbstractMethod; import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector; import org.springframework.stereotype.Component;
import java.util.List;
/** * @Description: 自定义方法SQL注入器 * @Title: CustomizedSqlInjector * @Package com.highgo.edu.common.batchOperation * @Author: * @Copyright * @CreateTime: 2022/11/3 16:21 */ @Component public class CustomizedSqlInjector extends DefaultSqlInjector { /** * 如果只需增加方法，保留mybatis plus自带方法， * 可以先获取super.getMethodList()，再添加add */ @Override public List<AbstractMethod> getMethodList(Class<?> mapperClass) { List<AbstractMethod> methodList = super .getMethodList(mapperClass); methodList.add( new InsertBatchMethod()); // methodList.add(new UpdateBatchMethod()); methodList.add( new MysqlInsertOrUpdateBath()); methodList.add( new PGInsertOrUpdateBath()); return methodList; }
} |
同时我们需要继承BaseMapper<T> 定义
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import com.baomidou.mybatisplus.core.mapper.BaseMapper; import org.apache.ibatis.annotations.Param;
import java.util.List; /** * @description:自定义接口覆盖BaseMapper，解决mybatis-plus 批量操作慢的问题 * @author: * @date: 2022/11/3 15:14 * @param: null * @return: **/ public interface RootMapper<T> extends BaseMapper<T> { /** * @description:批量插入 * @author: * @date: 2022/11/3 15:13 * @param: [list] * @return: int **/ int insertBatch( @Param ( "list" ) List<T> list); /** * @description:批量插入更新 * @author: * @date: 2022/11/3 15:14 * @param: [list] * @return: int **/ int mysqlInsertOrUpdateBatch( @Param ( "list" ) List<T> list);
int pgInsertOrUpdateBatch( @Param ( "list" ) List<T> list); } |
在需要使用批量更新插入的mapper上使用自定义的RootMapper
如下图
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import com.XX.edu.common.batchOperation.RootMapper; import com.XX.edu.exam.model.TScore; import org.springframework.stereotype.Repository;
/** * @Entity com.XX.edu.exam.model.TScore */ @Repository public interface TScoreMapper extends RootMapper<TScore> {
} |
下面我们来定义批量插入的方法：
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package com.XX.edu.common.batchOperation;
import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.core.enums.SqlMethod; import com.baomidou.mybatisplus.core.injector.AbstractMethod; import com.baomidou.mybatisplus.core.metadata.TableInfo; import com.baomidou.mybatisplus.core.metadata.TableInfoHelper; import org.apache.commons.lang3.StringUtils; import org.apache.ibatis.executor.keygen.Jdbc3KeyGenerator; import org.apache.ibatis.executor.keygen.KeyGenerator; import org.apache.ibatis.executor.keygen.NoKeyGenerator; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.SqlSource; import org.slf4j.Logger; import org.slf4j.LoggerFactory;
/** * @Description: 批量插入的方法 * @Title: InsertBatchMethod * @Package com.XX.edu.common.batchOperation * @Author: * @CreateTime: 2022/11/3 15:16 */ public class InsertBatchMethod extends AbstractMethod { Logger logger = LoggerFactory.getLogger(getClass());
@Override public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) { final String sql = "<script>insert into %s %s values %s</script>" ; final String fieldSql = prepareFieldSql(tableInfo); final String valueSql = prepareValuesSql(tableInfo); final String sqlResult = String.format(sql, tableInfo.getTableName(), fieldSql, valueSql); logger.debug( "sqlResult----->{}" , sqlResult); SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass); KeyGenerator keyGenerator = new NoKeyGenerator(); SqlMethod sqlMethod = SqlMethod.INSERT_ONE; String keyProperty = null ; String keyColumn = null ; // 表包含主键处理逻辑,如果不包含主键当普通字段处理 if (StringUtils.isNotEmpty(tableInfo.getKeyProperty())) { if (tableInfo.getIdType() == IdType.AUTO) { /* 自增主键 */ keyGenerator = new Jdbc3KeyGenerator(); keyProperty = tableInfo.getKeyProperty(); keyColumn = tableInfo.getKeyColumn(); } else { if ( null != tableInfo.getKeySequence()) { keyGenerator = TableInfoHelper.genKeyGenerator(sqlMethod.getMethod(),tableInfo, builderAssistant); keyProperty = tableInfo.getKeyProperty(); keyColumn = tableInfo.getKeyColumn(); } } } // 第三个参数必须和RootMapper的自定义方法名一致 return this .addInsertMappedStatement(mapperClass, modelClass, "insertBatch" , sqlSource, keyGenerator, keyProperty, keyColumn); }
/** * @description: 拼接字段值 * @author: * @date: 2022/11/3 15:20 * @param: [tableInfo] * @return: java.lang.String **/ private String prepareValuesSql(TableInfo tableInfo) { final StringBuilder valueSql = new StringBuilder(); valueSql.append( "<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">" ); //valueSql.append("#{item.").append(tableInfo.getKeyProperty()).append("},"); tableInfo.getFieldList().forEach(x -> valueSql.append( "#{item." ).append(x.getProperty()).append( "}," )); valueSql.delete(valueSql.length() - 1 , valueSql.length()); valueSql.append( "</foreach>" ); return valueSql.toString(); }
/** * @description:拼接字段 * @author: * @date: 2022/11/3 15:20 * @param: [tableInfo] * @return: java.lang.String **/ private String prepareFieldSql(TableInfo tableInfo) { StringBuilder fieldSql = new StringBuilder(); //fieldSql.append(tableInfo.getKeyColumn()).append(","); tableInfo.getFieldList().forEach(x -> { fieldSql.append(x.getColumn()).append( "," ); }); fieldSql.delete(fieldSql.length() - 1 , fieldSql.length()); fieldSql.insert( 0 , "(" ); fieldSql.append( ")" ); return fieldSql.toString(); } } |
继续定义批量插入更新的抽象方法
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package com.XX.edu.common.batchOperation;
import com.baomidou.mybatisplus.core.injector.AbstractMethod; import com.baomidou.mybatisplus.core.metadata.TableInfo; import org.apache.ibatis.executor.keygen.NoKeyGenerator; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.SqlSource;
/** * @Description: 批量插入更新 * @Title: InsertOrUpdateBath * @Package com.XX.edu.common.batchOperation * @Author: * @Copyright * @CreateTime: 2022/11/3 15:23 */ public abstract class InsertOrUpdateBathAbstract extends AbstractMethod { @Override public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) { final SqlSource sqlSource = prepareSqlSource(tableInfo, modelClass); // 第三个参数必须和RootMapper的自定义方法名一致 return this .addInsertMappedStatement(mapperClass, modelClass, prepareInsertOrUpdateBathName(), sqlSource, new NoKeyGenerator(), null , null );
}
protected abstract SqlSource prepareSqlSource(TableInfo tableInfo, Class<?> modelClass);
protected abstract String prepareInsertOrUpdateBathName();
} |
继承上面的抽象类----mysql版本（本版本未测试 根据自己需求修改）
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package com.XX.edu.common.batchOperation;
import com.baomidou.mybatisplus.core.metadata.TableInfo; import org.apache.ibatis.mapping.SqlSource; import org.springframework.util.StringUtils;
/** * @Description: 批量插入更新 * @Title: InsertOrUpdateBath * @Package com.XX.edu.common.batchOperation * @Author: * @Copyright * @CreateTime: 2022/11/3 15:23 */ public class MysqlInsertOrUpdateBath extends InsertOrUpdateBathAbstract {
@Override protected SqlSource prepareSqlSource(TableInfo tableInfo, Class<?> modelClass) { final String sql = "<script>insert into %s %s values %s ON DUPLICATE KEY UPDATE %s</script>" ; final String tableName = tableInfo.getTableName(); final String filedSql = prepareFieldSql(tableInfo); final String modelValuesSql = prepareModelValuesSql(tableInfo); final String duplicateKeySql = prepareDuplicateKeySql(tableInfo); final String sqlResult = String.format(sql, tableName, filedSql, modelValuesSql, filedSql, duplicateKeySql); //String.format(sql, tableName, filedSql, modelValuesSql, duplicateKeySql); //System.out.println("savaorupdatesqlsql="+sqlResult); return languageDriver.createSqlSource(configuration, sqlResult, modelClass); }
@Override protected String prepareInsertOrUpdateBathName() { return "mysqlInsertOrUpdateBath" ; }
String prepareDuplicateKeySql(TableInfo tableInfo) { final StringBuilder duplicateKeySql = new StringBuilder(); if (!StringUtils.isEmpty(tableInfo.getKeyColumn())) { duplicateKeySql.append(tableInfo.getKeyColumn()).append( "=values(" ).append(tableInfo.getKeyColumn()).append( ")," ); }
tableInfo.getFieldList().forEach(x -> { duplicateKeySql.append(x.getColumn()) .append( "=values(" ) .append(x.getColumn()) .append( ")," ); }); duplicateKeySql.delete(duplicateKeySql.length() - 1 , duplicateKeySql.length()); return duplicateKeySql.toString(); }
String prepareModelValuesSql(TableInfo tableInfo) { final StringBuilder valueSql = new StringBuilder(); valueSql.append( "<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">" ); if (!StringUtils.isEmpty(tableInfo.getKeyProperty())) { valueSql.append( "#{item." ).append(tableInfo.getKeyProperty()).append( "}," ); } tableInfo.getFieldList().forEach(x -> valueSql.append( "#{item." ).append(x.getProperty()).append( "}," )); valueSql.delete(valueSql.length() - 1 , valueSql.length()); valueSql.append( "</foreach>" ); return valueSql.toString(); }
/** * @description:准备属性名 * @author: * @date: 2022/11/3 15:25 * @param: [tableInfo] * @return: java.lang.String **/ String prepareFieldSql(TableInfo tableInfo) { StringBuilder fieldSql = new StringBuilder(); fieldSql.append(tableInfo.getKeyColumn()).append( "," ); tableInfo.getFieldList().forEach(x -> { fieldSql.append(x.getColumn()).append( "," ); }); fieldSql.delete(fieldSql.length() - 1 , fieldSql.length()); fieldSql.insert( 0 , "(" ); fieldSql.append( ")" ); return fieldSql.toString(); } } |
继承上面的抽象类----postgresql版本（已测试完成，其中id使用序列自增）
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package com.XX.edu.common.batchOperation;
import com.baomidou.mybatisplus.core.metadata.TableInfo; import org.apache.ibatis.mapping.SqlSource; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.util.StringUtils;
/** * @Description: 批量插入更新 * @Title: InsertOrUpdateBath * @Package com.XX.edu.common.batchOperation * @Author: * @Copyright * @CreateTime: 2022/11/3 15:23 */ public class PGInsertOrUpdateBath extends InsertOrUpdateBathAbstract { Logger logger = LoggerFactory.getLogger(getClass()); @Override protected SqlSource prepareSqlSource(TableInfo tableInfo, Class<?> modelClass) { final String sql = "<script>insert into %s %s values %s on conflict (id) do update set %s </script>" ; final String tableName = tableInfo.getTableName(); final String filedSql = prepareFieldSql(tableInfo); final String modelValuesSql = prepareModelValuesSql(tableInfo); final String duplicateKeySql = prepareDuplicateKeySql(tableInfo); final String sqlResult = String.format(sql, tableName, filedSql, modelValuesSql, duplicateKeySql); logger.info( "sql=={}" ,sqlResult); return languageDriver.createSqlSource(configuration, sqlResult, modelClass); }
@Override protected String prepareInsertOrUpdateBathName() { return "pgInsertOrUpdateBatch" ; }
private String prepareDuplicateKeySql(TableInfo tableInfo) { final StringBuilder duplicateKeySql = new StringBuilder(); if (!StringUtils.isEmpty(tableInfo.getKeyColumn())) { duplicateKeySql.append(tableInfo.getKeyColumn()).append( "=excluded." ).append(tableInfo.getKeyColumn()).append( "," ); }
tableInfo.getFieldList().forEach(x -> { duplicateKeySql.append(x.getColumn()) .append( "=excluded." ) .append(x.getColumn()) .append( "," ); }); duplicateKeySql.delete(duplicateKeySql.length() - 1 , duplicateKeySql.length()); return duplicateKeySql.toString(); }
private String prepareModelValuesSql(TableInfo tableInfo) { final StringBuilder valueSql = new StringBuilder(); valueSql.append( "<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">" ); if (!StringUtils.isEmpty(tableInfo.getKeyProperty())) { valueSql.append( "#{item." ).append(tableInfo.getKeyProperty()).append( "}," ); } tableInfo.getFieldList().forEach(x -> valueSql.append( "#{item." ).append(x.getProperty()).append( "}," )); valueSql.delete(valueSql.length() - 1 , valueSql.length()); valueSql.append( "</foreach>" ); return valueSql.toString(); }
/** * @description:准备属性名 * @author: * @date: 2022/11/3 15:25 * @param: [tableInfo] * @return: java.lang.String **/ private String prepareFieldSql(TableInfo tableInfo) { StringBuilder fieldSql = new StringBuilder(); if (!StringUtils.isEmpty(tableInfo.getKeyProperty())) { fieldSql.append(tableInfo.getKeyColumn()).append( "," ); }
tableInfo.getFieldList().forEach(x -> { fieldSql.append(x.getColumn()).append( "," ); }); fieldSql.delete(fieldSql.length() - 1 , fieldSql.length()); fieldSql.insert( 0 , "(" ); fieldSql.append( ")" ); return fieldSql.toString(); } } |
到此定义结束，下面开始使用
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@Service public class TNewExerciseServiceImpl extends ServiceImpl<TNewExerciseMapper, TNewExercise> implements TNewExerciseService { Logger logger = LoggerFactory.getLogger(getClass()); //引入mapper @Autowired TScoreMapper scoreMapper; //这样就可以批量新增更新操作了 public void test(List<TScore> collect){ scoreMapper.pgInsertOrUpdateBatch(collect); }
} |
但是如果collect数据量太大会出现异常
[Tried to send an out-of-range integer as a 2-byte value: 87923]
是因为pg对于sql语句的参数数量是有限制的，最大为32767。
看pg源码
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public void sendInteger2( int val) throws IOException { if (val >= - 32768 && val <= 32767 ) { this .int2Buf[ 0 ] = ( byte )(val >>> 8 ); this .int2Buf[ 1 ] = ( byte )val; this .pgOutput.write( this .int2Buf); } else { throw new IOException( "Tried to send an out-of-range integer as a 2-byte value: " + val); } } |
从源代码中可以看到pgsql使用2个字节的integer，故其取值范围为[-32768, 32767]。
这意味着sql语句的参数数量，即行数*列数之积必须小于等于32767.
比如，总共有17个字段，因为最大是32767，这样最多允许32767/ 17 大约是1 927个，所以要分批操作，或有能力的童鞋可以自己修改pg的驱动呦
分批插入代码如下：
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/** * @description: * @author: * @date: 2022/11/4 14:57 * @param: [list, fieldCount:列数] * @return: void **/ public void detachSaveOrUpdate_score(List<TScore> list, int fieldCount) { int numberBatch = 32767 ; //每一次插入的最大数 //每一次插入的最大行数 ， 向下取整 int v = ((Double) Math.floor(numberBatch / (fieldCount * 1.0 ))).intValue(); double number = list.size() * 1.0 / v; int n = ((Double) Math.ceil(number)).intValue(); //向上取整 for ( int i = 0 ; i < n; i++) { int end = v * (i + 1 ); if (end > list.size()) { end = list.size(); //如果end不能超过最大索引值 } scoreMapper.pgInsertOrUpdateBatch(list.subList(v * i, end)); //插入数据库 logger.info( "更新一次~~~{}-{}" , v * i, end); } } |
完成收工~~~
总结
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原文链接：https://blog.csdn.net/feixiangdexiaozhidan/article/details/127685532
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