在运行 Spring Batch 项目的时候，提示上面的错误信息：
java.sql.SQLSyntaxErrorException: (conn=12433) Table 'usrealestate.BATCH_JOB_INSTANCE' doesn't exist
问题和解决
这个问题如果是使用 Hibernate 的会话，没有使用 Spring JPA 的话，通常是不会提示的。
如果你在 application.properties 文件中配置了数据库连接的话，通常会提示上面的错误。
这是因为，如果你没有使用 Spring JPA 的话，Spring Batch 会启用一个 H2 数据库，在这个数据库中，Sping 会对 Batch 需要的配置进行配置。
如果你使用 Spring JPA 的话，你需要 Spring Batch 帮你初始化表。
解决办法就是在项目配置文件中，设置：
spring.batch.initialize-schema=ALWAYS
但是上面的内容会显示为被丢弃了。
在 2.7 的 Spring Boot 版本中，应该使用的配置为：
spring.batch.jdbc.initialize-schema=ALWAYS
如果使用的是 IDEA 的话，上面的内容会自动提示。
当你第一运行你的项目的时候，数据库会创建下面一堆表。
18:46:43.516 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_JOB_EXECUTION ( JOB_EXECUTION_ID BIGINT NOT NULL PRIMARY KEY , VERSION BIGINT , JOB_INSTANCE_ID BIGINT NOT NULL, CREATE_TIME DATETIME(6) NOT NULL, START_TIME DATETIME(6) DEFAULT NULL , END_TIME DATETIME(6) DEFAULT NULL , STATUS VARCHAR(10) , EXIT_CODE VARCHAR(2500) , EXIT_MESSAGE VARCHAR(2500) , LAST_UPDATED DATETIME(6), JOB_CONFIGURATION_LOCATION VARCHAR(2500) NULL, constraint JOB_INST_EXEC_FK foreign key (JOB_INSTANCE_ID) references BATCH_JOB_INSTANCE(JOB_INSTANCE_ID) ) ENGINE=InnoDB
18:46:45.087 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_JOB_EXECUTION_PARAMS ( JOB_EXECUTION_ID BIGINT NOT NULL , TYPE_CD VARCHAR(6) NOT NULL , KEY_NAME VARCHAR(100) NOT NULL , STRING_VAL VARCHAR(250) , DATE_VAL DATETIME(6) DEFAULT NULL , LONG_VAL BIGINT , DOUBLE_VAL DOUBLE PRECISION , IDENTIFYING CHAR(1) NOT NULL , constraint JOB_EXEC_PARAMS_FK foreign key (JOB_EXECUTION_ID) references BATCH_JOB_EXECUTION(JOB_EXECUTION_ID) ) ENGINE=InnoDB
18:46:46.209 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_STEP_EXECUTION ( STEP_EXECUTION_ID BIGINT NOT NULL PRIMARY KEY , VERSION BIGINT NOT NULL, STEP_NAME VARCHAR(100) NOT NULL, JOB_EXECUTION_ID BIGINT NOT NULL, START_TIME DATETIME(6) NOT NULL , END_TIME DATETIME(6) DEFAULT NULL , STATUS VARCHAR(10) , COMMIT_COUNT BIGINT , READ_COUNT BIGINT , FILTER_COUNT BIGINT , WRITE_COUNT BIGINT , READ_SKIP_COUNT BIGINT , WRITE_SKIP_COUNT BIGINT , PROCESS_SKIP_COUNT BIGINT , ROLLBACK_COUNT BIGINT , EXIT_CODE VARCHAR(2500) , EXIT_MESSAGE VARCHAR(2500) , LAST_UPDATED DATETIME(6), constraint JOB_EXEC_STEP_FK foreign key (JOB_EXECUTION_ID) references BATCH_JOB_EXECUTION(JOB_EXECUTION_ID) ) ENGINE=InnoDB
18:46:47.172 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_STEP_EXECUTION_CONTEXT ( STEP_EXECUTION_ID BIGINT NOT NULL PRIMARY KEY, SHORT_CONTEXT VARCHAR(2500) NOT NULL, SERIALIZED_CONTEXT TEXT , constraint STEP_EXEC_CTX_FK foreign key (STEP_EXECUTION_ID) references BATCH_STEP_EXECUTION(STEP_EXECUTION_ID) ) ENGINE=InnoDB
18:46:48.295 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_JOB_EXECUTION_CONTEXT ( JOB_EXECUTION_ID BIGINT NOT NULL PRIMARY KEY, SHORT_CONTEXT VARCHAR(2500) NOT NULL, SERIALIZED_CONTEXT TEXT , constraint JOB_EXEC_CTX_FK foreign key (JOB_EXECUTION_ID) references BATCH_JOB_EXECUTION(JOB_EXECUTION_ID) ) ENGINE=InnoDB
18:46:49.106 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_STEP_EXECUTION_SEQ ( ID BIGINT NOT NULL, UNIQUE_KEY CHAR(1) NOT NULL, constraint UNIQUE_KEY_UN unique (UNIQUE_KEY) ) ENGINE=InnoDB
18:46:50.080 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: INSERT INTO BATCH_STEP_EXECUTION_SEQ (ID, UNIQUE_KEY) select * from (select 0 as ID, '0' as UNIQUE_KEY) as tmp where not exists(select * from BATCH_STEP_EXECUTION_SEQ)
18:46:50.350 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_JOB_EXECUTION_SEQ ( ID BIGINT NOT NULL, UNIQUE_KEY CHAR(1) NOT NULL, constraint UNIQUE_KEY_UN unique (UNIQUE_KEY) ) ENGINE=InnoDB
18:46:51.088 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: INSERT INTO BATCH_JOB_EXECUTION_SEQ (ID, UNIQUE_KEY) select * from (select 0 as ID, '0' as UNIQUE_KEY) as tmp where not exists(select * from BATCH_JOB_EXECUTION_SEQ)
18:46:51.316 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: CREATE TABLE BATCH_JOB_SEQ ( ID BIGINT NOT NULL, UNIQUE_KEY CHAR(1) NOT NULL, constraint UNIQUE_KEY_UN unique (UNIQUE_KEY) ) ENGINE=InnoDB
18:46:52.151 [main] DEBUG o.m.jdbc.client.impl.StandardClient - execute query: INSERT INTO BATCH_JOB_SEQ (ID, UNIQUE_KEY) select * from (select 0 as ID, '0' as UNIQUE_KEY) as tmp where not exists(select * from BATCH_JOB_SEQ)
上面的表是根据你当前你数据库配置参数进行创建的。
如果查看数据库的话，将会看到下面表被创建了。
Spring Batch 使用数据库作为中间存储介质来存储需要的参数。