通过java执行pl sql块时出现的问题
我已经用java编写了以下代码通过java执行pl sql块时出现的问题,java,oracle,jdbc,plsql,Java,Oracle,Jdbc,Plsql,我已经用java编写了以下代码 package demo; import java.sql.CallableStatement; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Types; public class Sample { private Connection c = null; public Sam
package demo;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Types;
public class Sample {
private Connection c = null;
public Sample()
{
try {
c = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "system", "jboss");
String plsql = ""+
"declare"+
"x number;"+
"begin "+
"select HEADCOUNT FROM PROJECT where deptid=1;"+
"end;";
CallableStatement cs = c.prepareCall(plsql);
//cs.registerOutParameter(0, Types.INTEGER);
cs.execute();
System.out.println("Result is "+cs.getInt(1));
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args)
{
Sample z = new Sample();
}
}
我只想探索通过java执行plsql块的机制。
上面的一个只是简单的查询。
在执行上述java代码时,我得到的错误如下
java.sql.SQLException: Invalid SQL type: sqlKind = UNINITIALIZED
at oracle.jdbc.driver.T4CCallableStatement.doOall8(T4CCallableStatement.java:75)
at oracle.jdbc.driver.T4CCallableStatement.executeForRows(T4CCallableStatement.java:1043)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1336)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3714)
at oracle.jdbc.driver.OracleCallableStatement.execute(OracleCallableStatement.java:4755)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1378)
at demo.Sample.<init>(Sample.java:26)
at demo.Sample.main(Sample.java:36)
java.sql.SQLException:无效的sql类型:sqlKind=UNINITIALIZED
位于oracle.jdbc.driver.T4CCallableStatement.doOall8(T4CCallableStatement.java:75)
位于oracle.jdbc.driver.T4CCallableStatement.executeForRows(T4CCallableStatement.java:1043)
在oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1336)
位于oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
位于oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3714)
在oracle.jdbc.driver.OracleCallableStatement.execute(OracleCallableStatement.java:4755)中
位于oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1378)
在demo.Sample.(Sample.java:26)
位于demo.Sample.main(Sample.java:36)
在执行此类pl/sql块之前,请告诉我是否需要任何事先设置。1)第一个问题是其他答案中提到的declarex…
。2) 第二个问题是
从deptid=1的项目中选择人员编制代码>在plsql中,此查询无效。应选择编制到x…
一些错误:
字符串将连接到declarex
,您需要在它们之间留一个空格
您没有将表中的值选择到PL/SQL变量中
PL/SQL块没有将值放入绑定变量以将其返回Java(如果直接使用绑定变量,则不需要在PL/SQL中声明单独的变量)
您已经注释掉了要注册输出参数的行,并且这些参数是1索引的(不是0索引的)
大概是这样的:
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Types;
public class Sample {
public static void main( final String[] args )
{
try {
Class.forName( "oracle.jdbc.OracleDriver" ); // If you are using the Oracle driver.
Connection con = DriverManager.getConnection(
"jdbc:oracle:thin:@localhost:1521:XE",
"username",
"password"
);
CallableStatement cs = con.prepareCall(
"BEGIN SELECT HEADCOUNT INTO :1 FROM PROJECT WHERE deptid=1; END;"
);
cs.registerOutParameter( 1, Types.NUMERIC );
cs.execute();
System.out.println( cs.getInt( 1 ) );
}
catch ( ClassNotFoundException | SQLException ex )
{
System.err.println( ex.getMessage() );
}
}
}
在字符串中提供适当的空格以形成SQL
查询。这就是在使用必要的空格进行更改后的外观
String plsql = "declare x number; "+
"begin "+
"select HEADCOUNT FROM PROJECT where deptid=1; "+
"end;";
您需要用正确的空格更正代码,否则您想要传递的SQL
将在Java
/JDBC
代码中出错
您可以将PL/SQL
代码更改为以下内容:
CallableStatement cs = con.prepareCall(
"BEGIN SELECT HEADCOUNT INTO :1 FROM PROJECT WHERE deptid=1; END;"
);
希望这能很好地回答你的问题 您认为“declare”+“x
能给您带来什么?另请参见