Using Spring Batch JdbcCursorItemReader with NamedParameters

Question

The Spring Batch JdbcCursorItemReader can accept a preparedStatementSetter:

<bean id="reader" class="org.springframework.batch.item.database.JdbcCursorItemReader">
   <property name="dataSource" ref="..." />
   <property name="sql" value="SELECT * FROM test WHERE col1 = ?">
   <property name="rowMapper" ref="..." />
   <property name="preparedStatementSetter" ref="..." />
</bean>

This works well if the sql uses ? as placeholder(s), as in the above example. However, our pre-existing sql uses named parameters, e.g. SELECT * FROM test WHERE col1 = :param .

Is there a way to get a JdbcCursorItemReader to work with a NamedPreparedStatementSetter rather than a simple PreparedStatementSetter?

Thanks

Answer 1

You can try with jobParameters. In this case you don't need any PreparedStatementSetter.

<bean id="reader" class="org.springframework.batch.item.database.JdbcCursorItemReader">
   <property name="dataSource" ref="..." />
   <property name="sql" value="SELECT * FROM test WHERE col1 = #{jobParameters['col1']">
   <property name="rowMapper" ref="..." />
   <property name="preparedStatementSetter" ref="..." />
</bean>

pass the value when running the job

JobParameters param = new JobParametersBuilder().addString("col1", "value1").toJobParameters();

JobExecution execution = jobLauncher.run(job, param);

Answer 2

Once we don't have an official solution from spring, we can fix this problem using a simple approach:

1. Define one interface to provide the SqlParameters:

import org.springframework.jdbc.core.namedparam.SqlParameterSource;

public interface SqlParameterSourceProvider { 
    SqlParameterSource getSqlParameterSource();
}

2. Extending the JdbcCursorItemReader and adding the namedParameter features.

import org.springframework.batch.item.database.JdbcCursorItemReader;
import org.springframework.jdbc.core.SqlTypeValue;
import org.springframework.jdbc.core.StatementCreatorUtils;
import org.springframework.jdbc.core.namedparam.*;
import org.springframework.util.Assert;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.*;


public class NamedParameterJdbcCursorItemReader<T> extends JdbcCursorItemReader<T> {

    private SqlParameterSourceProvider parameterSourceProvider;
    private String paramedSql;

    public NamedParameterJdbcCursorItemReader(SqlParameterSourceProvider parameterSourceProvider) {
        this.parameterSourceProvider = parameterSourceProvider;
    }

    @Override
    public void setSql(String sql) {
        Assert.notNull(parameterSourceProvider, "You have to set parameterSourceProvider before the SQL statement");
        Assert.notNull(sql, "sql must not be null");
        paramedSql = sql;
        super.setSql(NamedParameterUtils.substituteNamedParameters(sql, parameterSourceProvider.getSqlParameterSource()));
    }

    @Override
    protected void applyStatementSettings(PreparedStatement stmt) throws SQLException {
        final ParsedSql parsedSql = NamedParameterUtils.parseSqlStatement(paramedSql);

        final List<?> parameters = Arrays.asList(NamedParameterUtils.buildValueArray(parsedSql, parameterSourceProvider.getSqlParameterSource(), null));
        for (int i = 0; i < parameters.size(); i++) {
            StatementCreatorUtils.setParameterValue(stmt, i + 1, SqlTypeValue.TYPE_UNKNOWN, parameters.get(i));
        }
    }
}

3. Creating the concrete class that implements the interface SqlParameterSourceProvider and has the state with the updated value of the parameters to be used in your query.

public class MyCustomSqlParameterSourceProvider implements SqlParameterSourceProvider {

    private Map<String, Object> params;

    public void updateParams(Map<String, Object> params) {
        this.params = params;
    }

    @Override
    public SqlParameterSource getSqlParameterSource() {
        final MapSqlParameterSource paramSource = new MapSqlParameterSource();
        paramSource.addValues(params);
        return paramSource;
    }
}

4. Finally, update the spring configuration.

<bean id="reader" class="org.wisecoding.stackoverflow.NamedParameterJdbcCursorItemReader">
    <constructor-arg ref="sqlParameterSourceProvider"/>        
    <property name="dataSource" ref="..." />
    <property name="sql" value=SELECT * FROM test WHERE col1 = :param" />
    <property name="rowMapper" ref="..." />
    <property name="preparedStatementSetter" ref="..." />
</bean>

<bean id="sqlParameterSourceProvider" class="org.wisecoding.stackoverflow.MyCustomSqlParameterSourceProvider">
</bean>

Answer 3

Currently, there is not a way to do this. The JdbcCursorItemReader uses raw JDBC (PreparedStatement) instead of the Spring JdbcTemplate under the hood (since there is no way to get the underlying ResultSet when using JdbcTemplate). If you'd like to contribute this as a new feature, or request it as a new feature, feel free to do so at jira.spring.io