Question

在我的java应用程序中，我使用SQLite。我有62列的表。这里的代码试图在此表中插入文档。

@Override
protected int insertToDB(Connection connection, String tableName, int pkDocsID, Map < Integer, String > fieldMap) throws SQLException {
    PreparedStatement ps = null;
    try {
        String parametersAsQMarks = DBManager.getInsertParametersAsQMarks(fieldMap.size() + COUNT_RESERVED_FIELDS);
        ps = connection.prepareStatement("INSERT INTO " + tableName + " VALUES (" + parametersAsQMarks + ")");
        ps.setInt(COUNT_RESERVED_FIELDS, pkDocsID); // reserved field
        int step = COUNT_RESERVED_FIELDS + 1;
        for (int index = 0; index < fieldMap.size(); index++) {
            String fieldValue = fieldMap.get(index + 1);
            ps.setString(index + step, fieldValue);
        }
        return ps.executeUpdate();
    } finally {
        if (ps != null) {
            ps.close();
        }
    }
}

但我得到错误：

 [java] [23.01.2018 20:57:28.312] 

md.deeplace.ca.db.SQLiteStrategy.insertM2Document(SQLiteStrategy.java:125) ERROR:
     [java]     table OUTDocsBS has 62 columns but 37 values were supplied
     [java] java.sql.SQLException: table OUTDocsBS has 62 columns but 37 values were supplied
     [java]     at org.sqlite.DB.throwex(DB.java:288)
     [java]     at org.sqlite.NestedDB.prepare(NestedDB.java:115)
     [java]     at org.sqlite.DB.prepare(DB.java:114)
     [java]     at org.sqlite.PrepStmt.<init>(PrepStmt.java:37)
     [java]     at org.sqlite.Conn.prepareStatement(Conn.java:231)
     [java]     at org.sqlite.Conn.prepareStatement(Conn.java:224)
     [java]     at org.sqlite.Conn.prepareStatement(Conn.java:213)
     [java]     at com.myproject.ca.db.SQLiteStrategy.insertToDB(SQLiteStrategy.java:64)

我想在填充不是所有列时插入文档。在这种情况下 - 37列。我怎么能这样做？

Answer 1

您需要为列命名。而不是：

..."INSERT INTO " + tableName + " VALUES (" + parametersAsQMarks + ")");

试

..."INSERT INTO " + tableName + "(columnName1, columnName2, ... columnName37) VALUES (" + parametersAsQMarks + ")");

其中每个命名列与要插入的相应fieldMap值匹配。根据代码，将fieldMap更改为Map<String, String>可能很有用，其中键是列名（而不是列号）。

当然，其他剩余列必须允许为空。

SQLite：如何插入文档而不是整个填充列？

1 个答案: