mybatis的参数一直出错，该怎么解决

Question

<delete id="deleteCar" parameterType="com.myMall.model.Car">
        DELETE FROM car WHERE car_id=#{car_id};
    </delete>

Error updating database.  Cause: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='car_id', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).
### The error may exist in sqlmap/Car.xml
### The error may involve car.deleteCar-Inline
### The error occurred while setting parameters
### SQL: DELETE FROM car WHERE car_id='?';
### Cause: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='car_id', mode=IN, javaType=class java.lang.String, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).] with root cause
java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0).

该怎么解决

Answer 1

参数类型不对，把

parameterType="com.myMall.model.Car"

改成

parameterType="java.lang.String"