jpa整合sqlLite

jpa整合sqlLite

新建标准springboot项目

导入依赖

            org.xerial
            sqlite-jdbc
        

配置yml文件

spring:
  application:
    name: demo
  datasource:
    driver-class-name: org.sqlite.JDBC
    username:
    password:
    url: jdbc:sqlite:E:\project\java_simple\db\##.db  #这里写数据库生成的路径，文件夹路径要存在
  jpa:
    database-platform: ####     #这里写SQLiteDialect的引用路径
    hibernate:
      ddl-auto: update
    show-sql: true
    open-in-view: false

sqLite的配置类

/**
 * @author zzs
 * @date 2021/9/15 15:23
 */
public class SQLiteDialect extends Dialect {
	private final UniqueDelegate uniqueDelegate;
	public SQLiteDialect() {
		registerColumnType(Types.BIT, "boolean");
		//registerColumnType(Types.FLOAT, "float");
		//registerColumnType(Types.DOUBLE, "double");
		registerColumnType(Types.DECIMAL, "decimal");
		registerColumnType(Types.CHAR, "char");
		registerColumnType(Types.LONGVARCHAR, "longvarchar");
		registerColumnType(Types.TIMESTAMP, "datetime");
		registerColumnType(Types.BINARY, "blob");
		registerColumnType(Types.VARBINARY, "blob");
		registerColumnType(Types.LONGVARBINARY, "blob");

		registerFunction("concat", new VarArgsSQLFunction(StandardBasicTypes.STRING, "", "||", ""));
		registerFunction("mod", new SQLFunctionTemplate(StandardBasicTypes.INTEGER, "?1 % ?2"));
		registerFunction("quote", new StandardSQLFunction("quote", StandardBasicTypes.STRING));
		registerFunction("random", new NoArgSQLFunction("random", StandardBasicTypes.INTEGER));
		registerFunction("round", new StandardSQLFunction("round"));
		registerFunction("substr", new StandardSQLFunction("substr", StandardBasicTypes.STRING));
		registerFunction("trim", new AbstractAnsiTrimEmulationFunction() {
			@Override
			protected SQLFunction resolveBothSpaceTrimFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "trim(?1)");
			}

			@Override
			protected SQLFunction resolveBothSpaceTrimFromFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "trim(?2)");
			}

			@Override
			protected SQLFunction resolveLeadingSpaceTrimFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "ltrim(?1)");
			}

			@Override
			protected SQLFunction resolveTrailingSpaceTrimFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "rtrim(?1)");
			}

			@Override
			protected SQLFunction resolveBothTrimFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "trim(?1, ?2)");
			}

			@Override
			protected SQLFunction resolveLeadingTrimFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "ltrim(?1, ?2)");
			}

			@Override
			protected SQLFunction resolveTrailingTrimFunction() {
				return new SQLFunctionTemplate(StandardBasicTypes.STRING, "rtrim(?1, ?2)");
			}
		});
		uniqueDelegate = new SQLiteUniqueDelegate(this);
	}
	private static final SQLiteDialectIdentityColumnSupport IDENTITY_COLUMN_SUPPORT = new
			SQLiteDialectIdentityColumnSupport();


	@Override
	public IdentityColumnSupport getIdentityColumnSupport() {
		return IDENTITY_COLUMN_SUPPORT;
	}

	private static final AbstractLimitHandler LIMIT_HANDLER = new AbstractLimitHandler() {
		//limit/offset support
		@Override
		public String processSql(String sql, RowSelection selection) {
			final boolean hasOffset = LimitHelper.hasFirstRow(selection);
			return sql + (hasOffset ? " limit ? offset ?" : " limit ?");
		}

		@Override
		public boolean supportsLimit() {
			return true;
		}

		@Override
		public boolean bindLimitParametersInReverseOrder() {
			return true;
		}
	};

	@Override
	public LimitHandler getLimitHandler() {
		return LIMIT_HANDLER;
	}

	@Override
	public boolean supportsLockTimeouts() {
		// lock acquisition support
		return false;
	}

	@Override
	public String getForUpdateString() {
		return "";
	}

	@Override
	public boolean supportsOuterJoinForUpdate() {
		return false;
	}


	@Override
	public boolean supportsCurrentTimestampSelection() {
		return true;
	}

	@Override
	public boolean isCurrentTimestampSelectStringCallable() {
		return false;
	}

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


	private static final int SQLITE_BUSY = 5;
	private static final int SQLITE_LOCKED = 6;
	private static final int SQLITE_IOERR = 10;
	private static final int SQLITE_CORRUPT = 11;
	private static final int SQLITE_NOTFOUND = 12;
	private static final int SQLITE_FULL = 13;
	private static final int SQLITE_CANTOPEN = 14;
	private static final int SQLITE_PROTOCOL = 15;
	private static final int SQLITE_TOOBIG = 18;
	private static final int SQLITE_CONSTRAINT = 19;
	private static final int SQLITE_MISMATCH = 20;
	private static final int SQLITE_NOTADB = 26;

	@Override
	public SQLExceptionConversionDelegate buildSQLExceptionConversionDelegate() {
		return (sqlException, message, sql) -> {
			final int errorCode = JdbcExceptionHelper.extractErrorCode(sqlException) & 0xFF;
			if (errorCode == SQLITE_TOOBIG || errorCode == SQLITE_MISMATCH) {
				return new DataException(message, sqlException, sql);
			} else if (errorCode == SQLITE_BUSY || errorCode == SQLITE_LOCKED) {
				return new LockAcquisitionException(message, sqlException, sql);
			} else if ((errorCode >= SQLITE_IOERR && errorCode <= SQLITE_PROTOCOL) || errorCode == SQLITE_NOTADB) {
				return new JDBCConnectionException(message, sqlException, sql);
			}
			// returning null allows other delegates to operate
			return null;
		};
	}

	@Override
	public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() {
		return EXTRACTER;
	}

	private static final ViolatedConstraintNameExtracter EXTRACTER = new TemplatedViolatedConstraintNameExtracter() {
		@Override
		protected String doExtractConstraintName(SQLException sqle) throws NumberFormatException {
			final int errorCode = JdbcExceptionHelper.extractErrorCode(sqle) & 0xFF;
			if (errorCode == SQLITE_CONSTRAINT) {
				return extractUsingTemplate("constraint ", " failed", sqle.getMessage());
			}
			return null;
		}
	};


	@Override
	public boolean supportsUnionAll() {
		return true;
	}

	@Override
	public boolean canCreateSchema() {
		return false;
	}

	@Override
	public boolean hasAlterTable() {
		// As specified in NHibernate dialect
		return false;
	}

	@Override
	public boolean dropConstraints() {
		return false;
	}

	@Override
	public boolean qualifyIndexName() {
		return false;
	}

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

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

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

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

	@Override
	public boolean supportsCommentOn() {
		return true;
	}

	@Override
	public boolean supportsIfExistsBeforeTableName() {
		return true;
	}

	@Override
	public boolean doesReadCommittedCauseWritersToBlockReaders() {
		// TODO Validate (WAL mode...)
		return true;
	}

	@Override
	public boolean doesRepeatableReadCauseReadersToBlockWriters() {
		return true;
	}

	@Override
	public boolean supportsTupleDistinctCounts() {
		return false;
	}

	@Override
	public int getInExpressionCountLimit() {
		// Compile/runtime time option: http://sqlite.org/limits.html#max_variable_number
		return 1000;
	}

	@Override
	public UniqueDelegate getUniqueDelegate() {
		return uniqueDelegate;
	}

	private static class SQLiteUniqueDelegate extends DefaultUniqueDelegate {
		public SQLiteUniqueDelegate(Dialect dialect) {
			super(dialect);
		}

		@Override
		public String getColumnDefinitionUniquenessFragment(Column column) {
			return " unique";
		}
	}

	@Override
	public String getSelectGUIDString() {
		return "select hex(randomblob(16))";
	}

	@Override
	public ScrollMode defaultScrollMode() {
		return ScrollMode.FORWARD_ONLY;
	}
}

//我是分界线
/**
 * @author zzs
 * @date 2021/9/15 15:30
 */
public class SQLiteDialectIdentityColumnSupport extends IdentityColumnSupportImpl {

    @Override
    public boolean supportsIdentityColumns() {
        return true;
    }

    @Override
    public boolean hasDataTypeInIdentityColumn() {
        return false;
    }

    @Override
    public String getIdentitySelectString(String table, String column, int type) throws MappingException {
        return "select last_insert_rowid()";
    }

    @Override
    public String getIdentityColumnString(int type) throws MappingException {
        return "integer";
    }
}

//我是分界线
/**
 * @author zzs
 * @date 2021/9/15 16:30
 */
@Slf4j
public class SQLiteMetadataBuilderInitializer implements MetadataBuilderInitializer {

    @Override
    public void contribute(MetadataBuilder metadataBuilder, StandardServiceRegistry serviceRegistry) {
        DialectResolver dialectResolver = serviceRegistry.getService(DialectResolver.class);

        if (!(dialectResolver instanceof DialectResolverSet)) {
            log.error("DialectResolver '{}' is not an instance of DialectResolverSet, not registering SQLiteDialect",
                    dialectResolver);
            return;
        }
        ((DialectResolverSet) dialectResolver).addResolver(resolver);
    }
    static private final SQLiteDialect dialect = new SQLiteDialect();
    static private final DialectResolver resolver = info -> {
       if("SQLite".equals(info.getDatabaseName())) {
           return dialect;
       }
       return null;
    };
}

写到这里SqLite就基本能使用了，记得配置数据库路径与类引用路径，然后导入其他依赖。直接利用Jpa就能结合使用了。不过SQLite的时区与本地时区不同。我这边是差8小时，可以手动建表的时候进行设置或代码里面减8小时。