spring-data-jpa 我是否必须在Spring Boot 时手动创建SQLite表

hwamh0ep  于 2022-11-10  发布在  Spring
关注(0)|答案(2)|浏览(200)

我试图从mariaDb切换到SQLite数据库在Spring Boot 。我一直在遵循一些教程,经过一段时间后,我终于得到了它的工作,但当我运行应用程序时,我得到了以下错误:

[SQLITE_ERROR] SQL error or missing database (no such table: user)

我的application.properties

spring.datasource.url=jdbc:sqlite:IperfDataBase
spring.datasource.driver-class-name=org.sqlite.JDBC;
spring.jpa.database-platform=my.packages.database.SQLiteDialect

我的数据源@Bean

@Bean
public DataSource dataSource() {
   DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create();
   dataSourceBuilder.driverClassName("org.sqlite.JDBC");
   dataSourceBuilder.url("jdbc:sqlite:IperfDataBase");
   return dataSourceBuilder.build();
}

我的SQLite方言

package my.packages.database;

import java.sql.Types;

import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.type.StringType;

public class SQLiteDialect extends Dialect {
    public SQLiteDialect() {
        registerColumnType(Types.BIT, "integer");
        registerColumnType(Types.TINYINT, "tinyint");
        registerColumnType(Types.SMALLINT, "smallint");
        registerColumnType(Types.INTEGER, "integer");
        registerColumnType(Types.BIGINT, "bigint");
        registerColumnType(Types.FLOAT, "float");
        registerColumnType(Types.REAL, "real");
        registerColumnType(Types.DOUBLE, "double");
        registerColumnType(Types.NUMERIC, "numeric");
        registerColumnType(Types.DECIMAL, "decimal");
        registerColumnType(Types.CHAR, "char");
        registerColumnType(Types.VARCHAR, "varchar");
        registerColumnType(Types.LONGVARCHAR, "longvarchar");
        registerColumnType(Types.DATE, "date");
        registerColumnType(Types.TIME, "time");
        registerColumnType(Types.TIMESTAMP, "timestamp");
        registerColumnType(Types.BINARY, "blob");
        registerColumnType(Types.VARBINARY, "blob");
        registerColumnType(Types.LONGVARBINARY, "blob");
        // registerColumnType(Types.NULL, "null");
        registerColumnType(Types.BLOB, "blob");
        registerColumnType(Types.CLOB, "clob");
        registerColumnType(Types.BOOLEAN, "integer");

        registerFunction( "concat", new VarArgsSQLFunction(StringType.INSTANCE, "", "||", "") );
        registerFunction( "mod", new SQLFunctionTemplate( StringType.INSTANCE, "?1 % ?2" ) );
        registerFunction( "substr", new StandardSQLFunction("substr", StringType.INSTANCE) );
        registerFunction( "substring", new StandardSQLFunction( "substr", StringType.INSTANCE) );
    }

    public boolean supportsIdentityColumns() {
        return true;
    }

    public boolean hasDataTypeInIdentityColumn() {
        return false;
    }
    public String getIdentityColumnString() {
        return "integer";
    }

    public String getIdentitySelectString() {
        return "select last_insert_rowid()";
    }

    public boolean supportsLimit() {
        return true;
    }

    protected String getLimitString(String query, boolean hasOffset) {
        return new StringBuffer(query.length()+20).
                append(query).
                append(hasOffset ? " limit ? offset ?" : " limit ?").
                toString();
    }

    public boolean supportsTemporaryTables() {
        return true;
    }

    public String getCreateTemporaryTableString() {
        return "create temporary table if not exists";
    }

    public boolean dropTemporaryTableAfterUse() {
        return false;
    }

    public boolean supportsCurrentTimestampSelection() {
        return true;
    }

    public boolean isCurrentTimestampSelectStringCallable() {
        return false;
    }

    public String getCurrentTimestampSelectString() {
        return "select current_timestamp";
    }

    public boolean supportsUnionAll() {
        return true;
    }

    public boolean hasAlterTable() {
        return false;
    }

    public boolean dropConstraints() {
        return false;
    }

    public String getAddColumnString() {
        return "add column";
    }

    public String getForUpdateString() {
        return "";
    }

    public boolean supportsOuterJoinForUpdate() {
        return false;
    }

    public String getDropForeignKeyString() {
        throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect");
    }

    public String getAddForeignKeyConstraintString(String constraintName,
                                                   String[] foreignKey, String referencedTable, String[] primaryKey,
                                                   boolean referencesPrimaryKey) {
        throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect");
    }

    public String getAddPrimaryKeyConstraintString(String constraintName) {
        throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect");
    }

    public boolean supportsIfExistsBeforeTableName() {
        return true;
    }

    public boolean supportsCascadeDelete() {
        return false;
    }
}

用户@实体:

import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import java.util.*;

import static javax.persistence.FetchType.*;
import static javax.persistence.GenerationType.*;

@Entity
@NoArgsConstructor
@AllArgsConstructor
public class User {
    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;
    @JsonIgnore
    private String username;
    @JsonIgnore
    private String password;
    @JsonIgnore
    @OneToOne(mappedBy = "user")
    private Port port;
    @JsonIgnore
    @ManyToMany(fetch = EAGER)
    private Collection<Role> roles = new ArrayList<>();
    @JsonIgnore
    @OneToMany(mappedBy = "user")
    private Set<Log> logs=new HashSet<>();
}

我的回购协议是:

import UPCPolska.Iperf.data.archetypes.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepo extends JpaRepository<User, Long> {
    User findByUsername(String username);
}

当然我有更多的表与关系,但它是太多,显示在这里。也许我的数据库是创建不正确的,我只是创建了一个空文件没有扩展名,我必须初始化它吗?还有,我需要做一些特殊的使用伪造密钥?什么可能是问题?

nbysray5

nbysray51#

您可以通过将此配置添加到您的application.propertis中来自动创建表:

spring.jpa.hibernate.ddl-auto=create-drop

它有update、create-drop和其他可以从documentation读取的选项。
在您启动springboot应用程序时,它将创建您的表。

r8uurelv

r8uurelv2#

您可以通过将以下属性添加到www.example.com中来自动创建表application.properties:
jpa.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.jp.j

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