Question

我正在尝试在Spring Boot 1.5.7版本中编写以下代码。

@Bean
        public JdbcBatchItemWriter<WriterSO> writer(DataSource dataSource, ItemPreparedStatementSetter<WriterSO> setter) {
            return new JdbcBatchItemWriterBuilder<WriterSO>()
                    .itemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>())
                    .itemPreparedStatementSetter(setter)
                    .sql("insert into writer (id, fullName, randomNum) values (?,?,?)").dataSource(dataSource).build();
        }

但无法使用或导入属于JdbcBatchItemWriterBuilder的软件包。这个软件包在springboot 1.5.7中不可用？

下面是我在项目中使用的pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.batch</groupId>
    <artifactId>Batchwithpostgres</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Batchwithpostgres</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project

>

任何建议在Springboot 1.5.7中工作时编写备用代码的建议

Answer 1

根据JdbcBatchItemWriterBuilder javadoc，它是在版本4中添加的，而Spring Boot 1.5.7使用的是Spring Batch的版本3，因此对您不可用。

您可以使用构造函数并设置所有必填字段：

@Bean
public JdbcBatchItemWriter<WriterSO> writer(DataSource dataSource, ItemPreparedStatementSetter<WriterSO> setter) {
    JdbcBatchItemWriter<WriterSO> jdbcBatchItemWriter = new JdbcBatchItemWriter<>();
    jdbcBatchItemWriter.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<WriterSO>());
    jdbcBatchItemWriter.setItemPreparedStatementSetter(setter);
    jdbcBatchItemWriter.setSql("insert into writer (id, fullName, randomNum) values (?,?,?)");
    jdbcBatchItemWriter.setDataSource(dataSource);
    return jdbcBatchItemWriter;
}

Answer 2

Spring Boot 1.5.7带来了Spring Batch 3.0.8，它不为项目读取器和写入器提供构建器。

这些构建器是introduced in Spring Batch 4，可以使用Spring Boot 2.x来使用。

在春季启动1.5.7版中无法导入JdbcBatchItemWriterBuilder

2 个答案: