將數據插入數據庫-org.h2.jdbc.JdbcSQLException：列數不匹配； SQL語句：

Question

我一直試圖將值保存到名為“ CLIENT”的數據庫中。

通過以下代碼創建數據庫：

package Database;

//STEP 1. Import required packages
import java.sql.*;

public class JDBCExampleCreateTables {
    // JDBC driver name and database URL
    private static String JDBC_DRIVER = "org.h2.Driver";
    private static String DB_URL = "jdbc:h2:file:C:/WAKILI/WAKILIdb";

    //  Database credentials
    private static String USER = "sa";
    private static String PASS = "";

    public static void main (String[] args) {
        Connection conn = null;
        Statement stmt = null;

        try {
            //STEP 2: Register JDBC driver
            Class.forName(JDBC_DRIVER);

            //STEP 3: Open a connection
            System.out.println("Connecting to a selected database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            System.out.println("Connected database successfully...");

            //STEP 4: Execute a query
            System.out.println("Creating table in given database...");
            stmt = conn.createStatement();

            String sql = "CREATE TABLE CLIENT " +
                    "(ID INT UNSIGNED NOT NULL AUTO_INCREMENT, " + 
                    " fullNames VARCHAR(255), " + 
                    " iDNumber VARCHAR(255), " + 
                    " pINNumber VARCHAR(255), " + 
                    " passportNumber VARCHAR(255), " + 
                    " postOfficeBoxNumber VARCHAR(255), " + 
                    " postalCode VARCHAR(255), " + 
                    " telephoneNumberLandline VARCHAR(255), " + 
                    " telephoneNumberMobile VARCHAR(255), " + 
                    " CARD VARCHAR(255)) "; 

            stmt.executeUpdate(sql);
            System.out.println("Created table in given database...");

        } catch (SQLException se) {
            //Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            // Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            // finally block used to close resources
            try {
                if (stmt!=null)
                    conn.close();
            } catch(SQLException se) {
            } // do nothing
            try {
                if (conn!=null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            } // end finally try
        } // end try
        System.out.println("Goodbye!");
    } // end main
} // end

我試圖保存到數據庫中的類是：

package Database;

//STEP 1. Import required packages
import java.sql.*;

public class JDBCExampleInsertRecords {
    public final String values;
    public final String table;

    public JDBCExampleInsertRecords (String values, String table) 
    {
        this.values = values;
        this.table = table;
    }

    // JDBC driver name and database URL
    private static String JDBC_DRIVER = "org.h2.Driver";
    private static String DB_URL = "jdbc:h2:file:C:/WAKILI/WAKILIdb";

    //  Database credentials
    private static String USER = "sa";
    private static String PASS = "";

    public static void main () {
        Connection conn = null;
        Statement stmt = null;

        try {
            //STEP 2: Register JDBC driver
            Class.forName(getJDBC_DRIVER());

            //STEP 3: Open a connection
            System.out.println("Connecting to a selected database...");
            conn = DriverManager.getConnection(getDB_URL(), getUSER(), getPASS());
            System.out.println("Connected database successfully...");

            //STEP 4: Execute a query
            System.out.println("Inserting records into the table...");
            stmt = conn.createStatement();

            String sql = "INSERT INTO CLIENT " + "VALUES ((values))";
            stmt.executeUpdate(sql);

            System.out.println("Inserted records into the table...");

        } catch (SQLException se) {
            //Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            //Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            //finally block used to close resources
            try {
                if (stmt != null)
                    conn.close();
            } catch (SQLException se) {
            } // do nothing
            try {
                if (conn!=null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            } //end finally try
        } //end try

        System.out.println("Goodbye!");
    } //end main

    /**
     * @return the JDBC_DRIVER
     */
    public static String getJDBC_DRIVER() {
        return JDBC_DRIVER;
    }

    /**
     * @param aJDBC_DRIVER the JDBC_DRIVER to set
     */
    public static void setJDBC_DRIVER(String aJDBC_DRIVER) {
        JDBC_DRIVER = aJDBC_DRIVER;
    }

    /**
     * @return the DB_URL
     */
    public static String getDB_URL() {
        return DB_URL;
    }

    /**
     * @param aDB_URL the DB_URL to set
     */
    public static void setDB_URL(String aDB_URL) {
        DB_URL = aDB_URL;
    }

    /**
     * @return the USER
     */
    public static String getUSER() {
        return USER;
    }

    /**
     * @param aUSER the USER to set
     */
    public static void setUSER(String aUSER) {
        USER = aUSER;
    }

    /**
     * @return the PASS
     */
    public static String getPASS() {
        return PASS;
    }

    /**
     * @param aPASS the PASS to set
     */
    public static void setPASS(String aPASS) {
        PASS = aPASS;
    }
} //end

獲取值的代碼在名為“ AddNewClient”的類中，如下所示：

    public String getValues () {
    String fullNames = fullNamesJTextField.getText();
    String iDNumber = identificationNumberJTextField.getText();
    String pINNumber = pINNumberJTextField.getText();
    String passportNumber = passportNumberJTextField.getText();
    String postOfficeBoxNumber = postOfficeBoxNumberJTextField.getText();
    String postalCode = postalCodeJTextField.getText();
    String telephoneNumberLandline = telephoneNumberLandlineJTextField.getText();
    String telephoneNumberMobile = telephoneNumberMobileJTextField.getText();

    List<String> client = new ArrayList<String>();

    client.add(fullNames);
    client.add(iDNumber);
    client.add(pINNumber);
    client.add(passportNumber);
    client.add(postOfficeBoxNumber);
    client.add(postalCode);
    client.add(telephoneNumberLandline);
    client.add(telephoneNumberMobile);

    StringBuilder builder = new StringBuilder();
    String listStringClient = "";

    for (String s : client)
    {
        listStringClient += "NULL" + "'" + s + "'" + ",";
    }

    return listStringClient;
}

我收到一條錯誤消息：

run:
Connecting to a selected database...
Connected database successfully...
Inserting records into the table...
org.h2.jdbc.JdbcSQLException: Column count does not match; SQL statement:

在過去的兩天里，我一直在做這件事，但沒有成功。 對於任何會來救我的人，我將非常非常偉大。 謝謝。

Answer 1

這是一個問題所在：

String sql = "INSERT INTO CLIENT " + "VALUES ((values))";
stmt.executeUpdate(sql);

值應該是getValues（）方法，而不僅僅是字符串，因此

String sql = "INSERT INTO CLIENT VALUES (" + getValues() + ")";

此外，由於您未指定哪些列，因此假定所有列均已在值中輸入。 如果CARD在您的SQL數據庫中沒有默認值，並且它不能為NULL，那么您將遇到問題。

最后，這有點奇怪：

for (String s : client)
{
    listStringClient += "NULL" + "'" + s + "'" + ",";
}

您將需要這些值，而不是'NULL'，因此它應該是

for (String s : client)
{
    listStringClient += "'" + s + "'" + ",";
}

最后，您的操作方式將在結尾處加一個逗號（例如：“ value1”，“ value2”，“ value3”，）

剪輯最后一個逗號：

return listStringClient.substring(0, listStringClient.size() - 1);

當然，有一種更好的方法來執行for循環，而無需使用多余的逗號。

最后，sql字符串應如下所示：

"INSERT INTO CLIENT VALUES('value1','value2','value3','value4','value5','value6')"

執行System.out.println（sql）並查看您要執行的String語句是什么。 然后，您會看到錯誤。

這是一種構建值字符串的更好方法，而不會出現逗號問題：

Iterator<String> iter = client.iterator();
StringBuilder sb = new StringBuilder();

while (iter.hasNext()) {
    sb.append("'").append(iter.next()).append("'");
    if (iter.hasNext())
        sb.append(",");
}
return sb.toString();

Answer 2

您不會在語句中傳遞任何值。 以下代碼是靜態的，沒有參數：

INSERT INTO CLIENT " + "VALUES ((values))

這是胡說八道的SQL命令：INSERT INTO CLIENT VALUES（（values））。 你想表達

String sql = "INSERT INTO CLIENT VALUES " + getValues()";

我更喜歡使用PreparedStatement，因為它很安全，並且可以避開危險字符：

String sql = "INSERT INTO PRODUCT VALUES(?,?,?,?,?,?,?,?,?,?)";
PreparedStatement prest = con.prepareStatement(sql);
prest.setString(1, "asdf");
prest.setInt(2, 2009);
// etc
int count = prest.executeUpdate();

Answer 3

您忘記提及CARD列的值了。 如果您不想在此處設置任何值，只需傳遞' ' 。

您的for循環應如下所示

for (String s : client)
{
    listStringClient += "NULL" + "'" + s + "'" + ",";//GIVES YOU ERROR BECAUSE AT THE END OF
}                                               // FOR LOOP IT HAS , IN THE END OF STRING.
 listStringClient+="' '";//This is for CARD COLUMN.

Answer 4

我認為不是：

String sql = "INSERT INTO CLIENT " + "VALUES ((values))";

您想要類似的東西：

String sql = "INSERT INTO CLIENT " + "VALUES ("+getValues()+")";

另外getValues的實現有點奇怪：

for (String s : client)
{
    listStringClient += "NULL" + "'" + s + "'" + ",";
}

可能是：

for (String s : client)
{
    listStringClient += "'" + s + "',"
}
listStringClient += "NULL";

Answer 5

非常感謝您提供令人驚奇的答案。 我提出了各種想法，並提出了解決問題的方案。

我對上述問題的工作答案來自Leos Literak，abmitchell，Vimal Bera和Grisha的答案。

通過以下代碼創建數據庫：

package Database;

//STEP 1. Import required packages
import java.sql.*;

public class JDBCExampleCreateTables {
    // JDBC driver name and database URL
    private static String JDBC_DRIVER = "org.h2.Driver";
    private static String DB_URL = "jdbc:h2:file:C:/WAKILI/WAKILIdb";

    //  Database credentials
    private static String USER = "sa";
    private static String PASS = "";

    public static void main (String[] args) {
        Connection conn = null;
        Statement stmt = null;

        try {
            //STEP 2: Register JDBC driver
            Class.forName(JDBC_DRIVER);

            //STEP 3: Open a connection
            System.out.println("Connecting to a selected database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            System.out.println("Connected database successfully...");

            //STEP 4: Execute a query
            System.out.println("Creating table in given database...");
            stmt = conn.createStatement();

            String sql = "CREATE TABLE CLIENT " +
                    "(ID INT UNSIGNED NOT NULL AUTO_INCREMENT, " + 
                    " fullNames VARCHAR(255), " + 
                    " iDNumber VARCHAR(255), " + 
                    " pINNumber VARCHAR(255), " + 
                    " passportNumber VARCHAR(255), " + 
                    " postOfficeBoxNumber VARCHAR(255), " + 
                    " postalCode VARCHAR(255), " + 
                    " telephoneNumberLandline VARCHAR(255), " + 
                    " telephoneNumberMobile VARCHAR(255)) "; 

            stmt.executeUpdate(sql);
            System.out.println("Created table in given database...");

        } catch (SQLException se) {
            //Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            // Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            // finally block used to close resources
            try {
                if (stmt!=null)
                    conn.close();
            } catch(SQLException se) {
            } // do nothing
            try {
                if (conn!=null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            } // end finally try
        } // end try
        System.out.println("Goodbye!");
    } // end main
} // end

保存到數據庫中的類是：

package Database;

//STEP 1. Import required packages
import java.sql.*;

public class JDBCExampleInsertRecords {
    public static String values;
    public final String table;

    public JDBCExampleInsertRecords (String values, String table) 
    {
        this.values = values;
        this.table = table;
    }

    // JDBC driver name and database URL
    private static String JDBC_DRIVER = "org.h2.Driver";
    private static String DB_URL = "jdbc:h2:file:C:/WAKILI/WAKILIdb";

    //  Database credentials
    private static String USER = "sa";
    private static String PASS = "";

    public static void main () {
        Connection conn = null;
        Statement stmt = null;

        try {
            //STEP 2: Register JDBC driver
            Class.forName(getJDBC_DRIVER());

            //STEP 3: Open a connection
            System.out.println("Connecting to a selected database...");
            conn = DriverManager.getConnection(getDB_URL(), getUSER(), getPASS());
            System.out.println("Connected database successfully...");

            //STEP 4: Execute a query
            System.out.println("Inserting records into the table...");
            stmt = conn.createStatement();

            String sql = "INSERT INTO CLIENT VALUES (NULL, " + (values) + ")";

            stmt.executeUpdate(sql);

            System.out.println("Inserted records into the table...");

        } catch (SQLException se) {
            //Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            //Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            //finally block used to close resources
            try {
                if (stmt != null)
                    conn.close();
            } catch (SQLException se) {
            } // do nothing
            try {
                if (conn!=null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            } //end finally try
        } //end try

        System.out.println("Goodbye!");
    } //end main

    /**
     * @return the JDBC_DRIVER
     */
    public static String getJDBC_DRIVER() {
        return JDBC_DRIVER;
    }

    /**
     * @param aJDBC_DRIVER the JDBC_DRIVER to set
     */
    public static void setJDBC_DRIVER(String aJDBC_DRIVER) {
        JDBC_DRIVER = aJDBC_DRIVER;
    }

    /**
     * @return the DB_URL
     */
    public static String getDB_URL() {
        return DB_URL;
    }

    /**
     * @param aDB_URL the DB_URL to set
     */
    public static void setDB_URL(String aDB_URL) {
        DB_URL = aDB_URL;
    }

    /**
     * @return the USER
     */
    public static String getUSER() {
        return USER;
    }

    /**
     * @param aUSER the USER to set
     */
    public static void setUSER(String aUSER) {
        USER = aUSER;
    }

    /**
     * @return the PASS
     */
    public static String getPASS() {
        return PASS;
    }

    /**
     * @param aPASS the PASS to set
     */
    public static void setPASS(String aPASS) {
        PASS = aPASS;
    }
} //end

獲取值的代碼在名為“ AddNewClient”的類中，如下所示：

    public String getValues () {
    String fullNames = fullNamesJTextField.getText();
    String iDNumber = identificationNumberJTextField.getText();
    String pINNumber = pINNumberJTextField.getText();
    String passportNumber = passportNumberJTextField.getText();
    String postOfficeBoxNumber = postOfficeBoxNumberJTextField.getText();
    String postalCode = postalCodeJTextField.getText();
    String telephoneNumberLandline = telephoneNumberLandlineJTextField.getText();
    String telephoneNumberMobile = telephoneNumberMobileJTextField.getText();

    List<String> client = new ArrayList<String>();

    client.add(fullNames);
    client.add(iDNumber);
    client.add(pINNumber);
    client.add(passportNumber);
    client.add(postOfficeBoxNumber);
    client.add(postalCode);
    client.add(telephoneNumberLandline);
    client.add(telephoneNumberMobile);

    Iterator<String> iter = client.iterator();
    StringBuilder sb = new StringBuilder();

    while (iter.hasNext()) {
        sb.append("'").append(iter.next()).append("'");
        if (iter.hasNext())
            sb.append(",");
    }

    return sb.toString();
    }