报错信息：
com.mysql.cj.exceptions.DataConversionException: Cannot determine value type from string '山东'
at com.mysql.cj.result.AbstractNumericValueFactory.createFromBytes(AbstractNumericValueFactory.java:66) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.protocol.a.MysqlTextValueDecoder.decodeByteArray(MysqlTextValueDecoder.java:134) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.protocol.result.AbstractResultsetRow.decodeAndCreateReturnValue(AbstractResultsetRow.java:133) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.protocol.result.AbstractResultsetRow.getValueFromBytes(AbstractResultsetRow.java:241) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.protocol.a.result.ByteArrayRow.getValue(ByteArrayRow.java:91) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.jdbc.result.ResultSetImpl.getObject(ResultSetImpl.java:1296) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.jdbc.result.ResultSetImpl.getInt(ResultSetImpl.java:797) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.mysql.cj.jdbc.result.ResultSetImpl.getInt(ResultSetImpl.java:818) ~[mysql-connector-java-8.0.22.jar:8.0.22]
at com.zaxxer.hikari.pool.HikariProxyResultSet.getInt(HikariProxyResultSet.java) ~[HikariCP-3.4.5.jar:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
at org.apache.ibatis.logging.jdbc.ResultSetLogger.invoke(ResultSetLogger.java:69) ~[mybatis-3.5.3.jar:3.5.3]
at com.sun.proxy.$Proxy79.getInt(Unknown Source) ~[na:na]
at org.apache.ibatis.type.IntegerTypeHandler.getNullableResult(IntegerTypeHandler.java:37) ~[mybatis-3.5.3.jar:3.5.3]
at org.apache.ibatis.type.IntegerTypeHandler.getNullableResult(IntegerTypeHandler.java:26) ~[mybatis-3.5.3.jar:3.5.3]
at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:81) ~[mybatis-3.5.3.jar:3.5.3]
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyAutomaticMappings(DefaultResultSetHandler.java:521) ~[mybatis-3.5.3.jar:3.5.3]
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:402) ~[mybatis-3.5.3.jar:3.5.3]
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354) ~[mybatis-3.5.3.jar:3.5.3]
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:328) ~[mybatis-3.5.3.jar:3.5.3]
报错原因：是字段，或者属性没对上，又或者是缺少无参构造器，可能是外键name值类型写错了String 写成 Integer，所有当两表联查时就会报错
