Spring Boot + jpa + oracle 整合及遇到的坑
阿新 • • 發佈：2019-01-04
組裡大佬擼的程式碼，借鑑簡單的部分
一、maven依賴
只需要三個依賴：springboot , springboot jpa , ojdc。lombok是@slf4j用的，可以簡化日誌程式碼；其中ojdc 如果maven不能下載的話，可以到csdn下載：https://download.csdn.net/download/qq_38113432/10647749
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc6</artifactId> <version>11.2.0.4</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
二、配置檔案
#最簡配置 spring.datasource.driver-class-name=oracle.jdbc.OracleDriver spring.datasource.url=jdbc:oracle:thin:@192.168.1.21:1521:assistantdb spring.datasource.username=assistant spring.datasource.password=assistant123 spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.Oracle10gDialect spring.jpa.hibernate.ddl-auto = update spring.jpa.show-sql=true server.port=8081
不得不提，springboot的約定大於配置真的很強大，幾行程式碼就完成了我們的配置
三、實體類
實體類很簡單，主要就是表名列名別寫錯
import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table( name = "FILE_INFO" ) public class FileInfoBean { @Column( name = "FILE_NAME" ) private String fileName; @Column( name = "DATE_TIME" ) @Id private String dateTime; @Column( name = "MONTH" ) private String month; @Column( name = "FILE_TYPE" ) private String fileType; @Column( name = "FILE_SIZE" ) private long fileSize; public FileInfoBean() { } public FileInfoBean( String fileName, String month, String dateTime, String fileType, long fileSize ) { this.fileName = fileName; this.month = month; this.dateTime = dateTime; this.fileType = fileType; this.fileSize = fileSize; } public String getFileName() { return fileName; } public void setFileName( String fileName ) { this.fileName = fileName; } public String getMonth() { return month; } public void setMonth( String month ) { this.month = month; } public String getDateTime() { return dateTime; } public void setDateTime( String dateTime ) { this.dateTime = dateTime; } public String getFileType() { return fileType; } public void setFileType( String fileType ) { this.fileType = fileType; } public long getFileSize() { return fileSize; } public void setFileSize( long fileSize ) { this.fileSize = fileSize; } }
四、Repository介面
繼承JpaRepository，新增想要的方法；這裡就是按月份和檔案型別分頁查詢
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
public interface FileInfoRepository extends JpaRepository< FileInfoBean, String > {
Page< FileInfoBean > findAllByMonthAndFileType( String month, String fileType, Pageable pageable );
}
五、Controller類
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
/**
* 查詢檔案資訊
*/
@RestController
@Slf4j
public class FileInfoController {
private FileInfoRepository FileInfoRepository;
private ObjectMapper mapper;
public FileInfoController( FileInfoRepository FileInfoRepository, ObjectMapper mapper ) {
this.FileInfoRepository = FileInfoRepository;
this.mapper = mapper;
}
@RequestMapping( "/getFileInfoLog" )
@ResponseBody
public String getFileInfoLog( @RequestParam( value = "page_index", required = false, defaultValue = "1" ) Integer pageNum,
@RequestParam( value = "page_total", required = false, defaultValue = "20" ) Integer pageSize,
@RequestParam( value = "file_type", defaultValue = "log" ) String fileType,
@RequestParam( value = "log_date" ) String month ) {
log.info( "查詢{}週期歸檔日誌，檔案型別{}，分頁資訊：當前第{}頁 - 每頁{}條資料", month, fileType, pageNum, pageSize );
// 初始化返回值
String responseJson = "{}";
Map< String, Object > result = new HashMap<>( 3 );
result.put( "result", 500 );
result.put( "message", "資料轉換失敗！" );
result.put( "data", new ArrayList<>() );
// 準備分頁條件
Pageable pageable = PageRequest.of( pageNum, pageSize, Sort.Direction.DESC, "dateTime" );
// 查詢結果
log.info( "查詢歸檔資訊資料..." );
Page< FileInfoBean > page = FileInfoRepository.findAllByMonthAndAndFileType( month, fileType, pageable );
log.info( "查詢到{}條歸檔資訊資料", page.getTotalElements() );
// 組裝返回值
result.put( "result", 200 );
result.put( "message", "成功" );
result.put( "data", page.getContent() );
try {
responseJson = mapper.writeValueAsString( result );
} catch ( JsonProcessingException e ) {
log.error( "資料轉換失敗!", e );
}
log.info( "查詢結果準備完畢，返回結果資料！" );
return responseJson;
}
}
接下來就啟動程式訪問介面測試吧，其他的增刪改查是需要呼叫不同的repository就行了
六、遇到的坑
1. Pageable pageable = PageRequest.of( pageNum, pageSize, Sort.Direction.DESC, "dateTime" );
分頁中的排序欄位用的是bean類中的欄位，不是資料庫表中的欄位，我們用資料庫中的欄位"date_time"就報錯了
"no property name DATE found for ...";
2.jpa中預設用了sql server的方言，使用oracle 的方言需要在application檔案中加入配置
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.Oracle10gDialect