使用shardingsphere对SQLServer坑的解决

        <!--sharding-->
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.8</version>
        </dependency>

package cn.preserve.config.mybatis;
 
 
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedJdbcTypes;
import org.apache.ibatis.type.TypeException;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
 
/**
 *  将 nvarchar 转成 varchar  sharingJDBC不支持nvarchar
 *  主要是NStringTypeHandler中，没有setNString()
 */
@MappedJdbcTypes(JdbcType.NVARCHAR)
public class NVarcharTypeHandler extends BaseTypeHandler<String> {
 
    @Override
    public void setParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType) throws SQLException {
        if(parameter == null) {
            if(jdbcType == null) {
                throw new TypeException("JDBC requires that the JdbcType must be specified for all nullable parameters.");
            }
 
            try {
                ps.setNull(i, jdbcType.TYPE_CODE);
            } catch (SQLException var7) {
                throw new TypeException("Error setting null for parameter #" + i + " with JdbcType " + jdbcType + " . " + "Try setting a different JdbcType for this parameter or a different jdbcTypeForNull configuration property. " + "Cause: " + var7, var7);
            }
        } else {
            try {
                this.setNonNullParameter(ps, i, parameter, jdbcType);
            } catch (Exception var6) {
                throw new TypeException("Error setting non null for parameter #" + i + " with JdbcType " + jdbcType + " . " + "Try setting a different JdbcType for this parameter or a different configuration property. " + "Cause: " + var6, var6);
            }
        }
    }
 
    /**
     * 这里使用setNString而不是setString
     * @param ps
     * @param i
     * @param parameter
     * @param jdbcType
     * @throws SQLException
     */
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType) throws SQLException {
        ps.setString(i, parameter);
    }
    
    @Override
    public String getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return rs.getString(columnName);
    }
 
    @Override
    public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return rs.getString(columnIndex);
    }
 
    @Override
    public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return cs.getString(columnIndex);
    }
 
 
}

@Configuration
public class DataSourceConfig {
 
    @Bean(name = "sqlSessionFactory")
    @Primary
    public SqlSessionFactory memberDb1SqlSessionFactory(DataSource dataSource)
            throws Exception {
        SqlSessionFactoryBean bean = getSqlSessionFactoryBean(dataSource);
        bean.setTypeHandlers(new TypeHandler[] {new NVarcharTypeHandler()});
        return bean.getObject();
    }
 
   // ******* 其他实现
}

<typeHandlers>
	<typeHandler handler="cn.preserve.config.mybatis.NVarcharTypeHandler"/>
</typeHandlers>