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plsqljdbc:如何获取最后一行ID?

plsql jdbc oracle java

Haoest · 技术社区 · 14 年前

PLSQL(Oracle)与这个sqlserver片段的等价物是什么?

BEGIN TRAN
INSERT INTO mytable(content) VALUES ("test") -- assume there's an ID column that is autoincrement
SELECT @@IDENTITY
COMMIT TRAN

如何在Oracle中插入新行,并让JDBC获得新id的副本?

编辑: 巴鲁斯克提供了一个非常好的起点。由于某些原因,JDBC不喜欢命名参数绑定。这会导致“参数设置或注册不正确”SQLException。为什么会这样?

        OracleConnection conn = getAppConnection();
        String q = "BEGIN INSERT INTO tb (id) values (claim_seq.nextval) returning id into :newId; end;" ;
        CallableStatement cs = (OracleCallableStatement) conn.prepareCall(q);
        cs.registerOutParameter("newId", OracleTypes.NUMBER);
        cs.execute();
        int newId = cs.getInt("newId");

3 回复 | 直到 14 年前

Community CDub 8 年前

正常情况下 你会用 Statement#getGeneratedKeys() 为此(另请参见 this answer 但是到目前为止(仍然)oraclejdbc驱动程序不支持这一点。

你最好的办法就是利用 CallableStatement RETURNING 条款:

String sql = "BEGIN INSERT INTO mytable(id, content) VALUES (seq_mytable.NEXTVAL(), ?) RETURNING id INTO ?; END;";

Connection connection = null;
CallableStatement statement = null;

try {
    connection = database.getConnection();
    statement = connection.prepareCall(sql);
    statement.setString(1, "test");
    statement.registerOutParameter(2, Types.NUMERIC);
    statement.execute();
    int id = statement.getInt(2);
    // ...

或者 SELECT sequencename.CURRVAL INSERT 在同一交易中:

String sql_insert = "INSERT INTO mytable(content) VALUES (?)";
String sql_currval = "SELECT seq_mytable.CURRVAL FROM dual";

Connection connection = null;
PreparedStatement statement = null;
Statement currvalStatement = null;
ResultSet currvalResultSet = null;

try {
    connection = database.getConnection();
    connection.setAutoCommit(false);
    statement = connection.prepareStatement(sql_insert);
    statement.setString(1, "test");
    statement.executeUpdate();
    currvalStatement = connection.createStatement();
    currvalResultSet = currvalStatement.executeQuery(sql_currval);
    if (currvalResultSet.next()) {
        int id = currvalResultSet.getInt(1);
    }
    connection.commit();
    // ...

Pablo Santa Cruz 14 年前

你可以用甲骨文的 returning 条款。

insert into mytable(content) values ('test') returning your_id into :var;

this link 对于代码示例。您需要oracle10g或更高版本,以及新版本的JDBC驱动程序。

finejustice 11 年前

下面是一个片段:

    // change the string to your connection string
    Connection connection = DriverManager.getConnection("connection string");

    // assume that the field "id" is PK, and PK-trigger exists 
    String sql = "insert into my_table(id) values (default)";
    // you can select key field by field index
    int[] colIdxes = { 1 };
    // or by field name
    String[] colNames = { "id" };

    // Java 1.7 syntax; try-finally for older versions
    try (PreparedStatement preparedStatement = connection.prepareStatement(sql, colNames))
    {
        // note: oracle JDBC driver do not support auto-generated key feature with batch update
        //          // insert 5 rows
        //          for (int i = 0; i < 5; i++)
        //          {
        //              preparedStatement.addBatch();
        //          }
        //          
        //          int[] batch = preparedStatement.executeBatch();
        preparedStatement.executeUpdate();

        // get generated keys
        try (ResultSet resultSet = preparedStatement.getGeneratedKeys())
        {
            while (resultSet.next())
            {
                // assume that the key's type is BIGINT
                long id = resultSet.getLong(1);
                assertTrue(id != 0);

                System.out.println(id);
            }
        }
    }

http://docs.oracle.com/cd/E16655_01/java.121/e17657/jdbcvers.htm#CHDEGDHJ

seregamorph 5 年前

万一你用 spring-jdbc 对于数据库,您可以考虑从 morejdbc ,它将如下所示:

import static org.morejdbc.SqlTypes.BIGINT;
import static org.morejdbc.JdbcCall.callSql;
import static org.morejdbc.*;
...

Out<Long> idOut = Out.of(BIGINT);
jdbcTemplate.execute(callSql("BEGIN INSERT INTO mytable(id, content) VALUES (seq_mytable.NEXTVAL(), ?) "
        + "RETURNING id INTO ?; END;")
        .in(content)
        .out(BIGINT, idOut));
System.out.println("Id is " + idOut.get());

如果你有一个像

@lombok.Data
public class Entity {
    private long id;
    private String content;
}

Entity entity = ;

jdbcTemplate.execute(callSql("BEGIN INSERT INTO mytable(id, content) VALUES (seq_mytable.NEXTVAL(), ?) "
        + "RETURNING id INTO ?; END;")
        .in(entity.getContent())
        .out(BIGINT, entity::setId));
System.out.println("Id is " + entity.get());