我有一瓢酒，可以慰风尘。——韦应物
以mysql语法INSERT INTO user_info (name,age,email) VALUES ( ?,?,? ),( ?,?,? )举例：
首先注入自定义策略
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| package io.github.vampireachao.stream.plugin.mybatisplus.injector;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
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;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.List;
@Configuration
public class SqlInjectorConfig {
@Bean
public DefaultSqlInjector defaultSqlInjector() {
return new DefaultSqlInjector() {
@Override
public List<AbstractMethod> getMethodList(Class<?> mapperClass, TableInfo tableInfo) {
List<AbstractMethod> methodList = super.getMethodList(mapperClass, tableInfo);
methodList.add(new AbstractMethod(SqlMethodEnum.INSERT_BATCH.getMethod()) {
@Override
public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
final String sql = SqlMethodEnum.INSERT_BATCH.getSql();
final String fieldSql = prepareFieldSql(tableInfo);
final String valueSql = prepareValuesSqlForMysqlBatch(tableInfo);
final String sqlResult = String.format(sql, tableInfo.getTableName(), fieldSql, valueSql);
SqlSource sqlSource = languageDriver.createSqlSource(configuration, sqlResult, modelClass);
return this.addInsertMappedStatement(mapperClass, modelClass, sqlSource, new NoKeyGenerator(), null, null);
}
private String prepareFieldSql(TableInfo tableInfo) {
StringBuilder fieldSql = new StringBuilder();
if (!IdType.AUTO.equals(tableInfo.getIdType())) {
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();
}
private String prepareValuesSqlForMysqlBatch(TableInfo tableInfo) {
final StringBuilder valueSql = new StringBuilder();
valueSql.append("<foreach collection=\"list\" item=\"item\" index=\"index\" open=\"(\" separator=\"),(\" close=\")\">");
if (!IdType.AUTO.equals(tableInfo.getIdType())) {
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();
}
});
return methodList;
}
};
}
}
|
这里用到的枚举：
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| package io.github.vampireachao.stream.plugin.mybatisplus.injector;
public enum SqlMethodEnum {
INSERT_BATCH("insertBatch", "插入多条数据（mysql语法批量）", "<script>\nINSERT INTO %s %s VALUES %s\n</script>"),
;
private final String method;
private final String desc;
private final String sql;
SqlMethodEnum(String method, String desc, String sql) {
this.method = method;
this.desc = desc;
this.sql = sql;
}
public String getMethod() {
return method;
}
public String getDesc() {
return desc;
}
public String getSql() {
return sql;
}
}
|
然后编写自定义公共Mapper
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| package io.github.vampireachao.stream.plugin.mybatisplus.injector;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Param;
import java.util.Collection;
public interface IMapper<T> extends BaseMapper<T> {
int insertBatch(@Param("list") Collection<T> list);
}
|
使用：
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| package io.github.vampireachao.stream.plugin.mybatisplus.mapper;
import io.github.vampireachao.stream.plugin.mybatisplus.injector.IMapper;
import io.github.vampireachao.stream.plugin.mybatisplus.pojo.po.UserInfo;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserInfoMapper extends IMapper<UserInfo> {
}
|
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| @Test
void insertBatchTest() {
UserInfo entity = new UserInfo();
entity.setName("cat");
entity.setAge(20);
entity.setEmail("achao1441470436@gmail.com");
UserInfo userInfo = new UserInfo();
userInfo.setName("ruben");
List<UserInfo> list = Arrays.asList(userInfo, entity);
int i = userInfoMapper.insertBatch(list);
Assertions.assertEquals(2, i);
Assertions.assertEquals(7, QueryHelper.count(UserInfo.class));
}
|
生成sql
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| 2022-07-26 12:50:12.237 DEBUG 34136 --- [ main] o.s.jdbc.datasource.init.ScriptUtils : 5 returned as update count for SQL: INSERT INTO user_info (name, age, email) VALUES ('Jone', 18, 'test1@baomidou.com'), ('Jack', 18, 'test2@baomidou.com'), ('Tom', 28, 'test3@baomidou.com'), ('Sandy', 21, 'test4@baomidou.com'), ('Billie', 24, 'test5@baomidou.com')
|