Java中使用Mybatis批量插入数据时Mapper.xml中的sql如下：
<insert id="batchSave">
into t_emp(emp_name,emp_email,dept_id) VALUES
<foreach collection="list" item="emp" separator=",">
(#{emp.empName}, #{emp.empEmail}, #{emp.deptId})
</foreach>
</insert>
DAO层方法:
/**
*
* @Title: batchSave
* @Description: 批量保存
* @param List
* @throws Exception
*/
public void batchSave(List<Emp> empList);
修改MyBatis测试类，增加测试方法testBatchSave
@Test
public void testBatchSave() throws IOException {
SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
SqlSession openSession = sqlSessionFactory.openSession();
try {
EmpMapper mapper = openSession.getMapper(EmpMapper.class);
List<Emp> empList = new ArrayList<Emp>();
empList.add(new Emp(null,"Lucy","[email protected]",1));
empList.add(new Emp(null,"Lily","[email protected]",2));
empList.add(new Emp(null,"Lizy","[email protected]",3));
//一定要先检查empList不为空再插入
if(empList!=null){
mapper.batchSave(empList);
}
//别忘了事务最后要提交
openSession.commit();
} finally {
openSession.close();
}
}
出现错误如下：
Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1......
解决办法：
1.检查SQL语句是不是出现SQL固定的关键字(不论大小写，都不能出现)；
2.不确定的话将表名，字段名用`[ESC下面的按钮]引用起来；
3.检查Java代码中批量的插入的List是不是为空，一定要判断不为空再调用批量插入函数；
4.连接mysql的url后面加上&allowMultiQueries=true;
5.使用mybtis的Batch类型的Executor使用是否正确；
SqlSession sqlSession = sqlSessionTemplate.getSqlSessionFactory().openSession(ExecutorType.BATCH, false);
下面列出MySQL所有关键字，希望给使用MySQL的朋友提供一些参考帮助。
ADD ALL ALTER
ANALYZE AND AS
ASC ASENSITIVE BEFORE
BETWEEN BIGINT BINARY
BLOB BOTH BY
CALL CASCADE CASE
CHANGE CHAR CHARACTER
CHECK COLLATE COLUMN
CONDITION CONNECTION CONSTRAINT
CONTINUE CONVERT CREATE
CROSS CURRENT_DATE CURRENT_TIME
CURRENT_TIMESTAMP CURRENT_USER CURSOR
DATABASE DATABASES DAY_HOUR
DAY_MICROSECOND DAY_MINUTE DAY_SECOND
DEC DECIMAL DECLARE
DEFAULT DELAYED DELETE
DESC DESCRIBE DETERMINISTIC
DISTINCT DISTINCTROW DIV
DOUBLE DROP DUAL
EACH ELSE ELSEIF
ENCLOSED ESCAPED EXISTS
EXIT EXPLAIN FALSE
FETCH FLOAT FLOAT4
FLOAT8 FOR FORCE
FOREIGN FROM FULLTEXT
GOTO GRANT GROUP
HAVING HIGH_PRIORITY HOUR_MICROSECOND
HOUR_MINUTE HOUR_SECOND IF
IGNORE IN INDEX
INFILE INNER INOUT
INSENSITIVE INSERT INT
INT1 INT2 INT3
INT4 INT8 INTEGER
INTERVAL INTO IS
ITERATE JOIN KEY
KEYS KILL LABEL
LEADING LEAVE LEFT
LIKE LIMIT LINEAR
LINES LOAD LOCALTIME
LOCALTIMESTAMP LOCK LONG
LONGBLOB LONGTEXT LOOP
LOW_PRIORITY MATCH MEDIUMBLOB
MEDIUMINT MEDIUMTEXT MIDDLEINT
MINUTE_MICROSECOND MINUTE_SECOND MOD
MODIFIES NATURAL NOT
NO_WRITE_TO_BINLOG NULL NUMERIC
ON OPTIMIZE OPTION
OPTIONALLY OR ORDER
OUT OUTER OUTFILE
PRECISION PRIMARY PROCEDURE
PURGE RAID0 RANGE
READ READS REAL
REFERENCES REGEXP RELEASE
RENAME REPEAT REPLACE
REQUIRE RESTRICT RETURN
REVOKE RIGHT RLIKE
SCHEMA SCHEMAS SECOND_MICROSECOND
SELECT SENSITIVE SEPARATOR
SET SHOW SMALLINT
SPATIAL SPECIFIC SQL
SQLEXCEPTION SQLSTATE SQLWARNING
SQL_BIG_RESULT SQL_CALC_FOUND_ROWS SQL_SMALL_RESULT
SSL STARTING STRAIGHT_JOIN
TABLE TERMINATED THEN
TINYBLOB TINYINT TINYTEXT
TO TRAILING TRIGGER
TRUE UNDO UNION
UNIQUE UNLOCK UNSIGNED
UPDATE USAGE USE
USING UTC_DATE UTC_TIME
UTC_TIMESTAMP VALUES VARBINARY
VARCHAR VARCHARACTER VARYING
WHEN WHERE WHILE
WITH WRITE X509
XOR YEAR_MONTH ZEROFILL